Foraging: identifying creeping cucumber, edible wild fruit

Latin name: Melothria pendula
Common name: Creeping cucumber
Season: Summer
Edible: Unripe fruit ONLY
Flavor: Good
Medicinal value: Unknown, but see notes below
Nutritional value: Carbohydrates, fiber, vitamin C and a surprising amount of protein

Identification difficulty: Beginner

Note on edibility: Only unripe fruits, which are light to medium green and hard should be eaten. Once even slightly soft or dark green, these fruits become dangerous laxatives. Some people, myself included, are highly sensitive to the laxative effects of this plant, even when the fruit is very unripe. I recommend only trying 1-3 at first, until you discover how you react. 

This charming little viny plant is Melothria pendula, commonly known as the creeping cucumber or the Guadalupe cucumber. The common names come from the similar appearance of the plant to cultivated cucumbers, although in miniature. Despite the names and the similar appearance, creeping cucumber is only distantly related to its cultivated cousins; they are both in the Cucurbitaceae family. 

The Cucurbitaceae family, or the gourd family, contains most melons, gourds, squashes and cucumbers. Cultivated cucumbers are part of the Benincaseae tribe (which also contains watermelons) and the Cucumis genus, but creeping cucumbers are not part of that tribe. 

What creeping cucumber does have in common with cucumbers and the white rind of watermelons is the taste. 

Creeping cucumber flower and young leaves

Creeping cucumber range

In the United States, creeping cucumber is found in the southeast states only, from Virginia south to Florida, and west as far as Kansas, Oklahoma and Texas. In rare occurrences it has been found in Pennsylvania, though be sure to really check your identification that far north. 

Outside of the USA, this plant can be found in Mexico, Central America, including the islands of the West Indies, and parts of South America. I am not sure how far south it extends. It has also been found tropical areas of the far east, such as Malaysia, Sumatra, the Philippines, and Bali. It is likely introduced to those areas. 

As always, this post is intended for readers in the United States, and I cannot account for potential look-a-likes in other countries, as I would not be aware of them. 

Creeping cucumber season

In the southern USA, you may begin to find fruit as early as June, and fruiting will continue throughout the summer, until the days start to shorten in September. In the northern part of the plant's range, you can't expect fruit before July. 

Creeping cucumber identification

Creeping cucumber leaves

Creeping cucumber stem, vine and leaf features 

Creeping cucumber is a tiny vine, only about 3-4mm in diameter, though the fruit-bearing tendrils will be thinner. The image to the right gives you a pretty good idea of the thickness of the vines as compared to my fingers.

As shown in the photo above, the thin leaves are palmate, which is to say that the leaf veins all come from a single point where they connect to the stem, like the fronds on a palm tree connect to the trunk.

They have 3 lobes when young, but 5 when mature, though 2 lobes will always be rather subtle. I have numbered them to make them easier to see in the photo above. 

As creeping cucumber is a vine, it can't support its own weight and creep over woody plants and even young trees, often forming dense mats. (See below.) Plants covered this way will die. 

The vine attaches to other plants via delicate tendrils shown here. The leaves, stems, vines and tendrils are all poisonous and should not be eaten. 

Creeping cucumber tendrils

A dense mat of creeping cucumber vines, covering other plants and underbrush.

Flowers 

Creeping cucumber flowers are bright yellow and have 5 petals. Each petal is notched at the end.

The flowers are dainty, around 7mm in diameter, or slightly larger than a pencil eraser. 

The flowers hang off pendules (from which the plant gets the second part of its Latin name: pendula), at the node where two opposite leaves meet on the vine. This means that the flowers, and the fruit they turn into, will often be hidden under the leaves. 

This unripe fruit is at the perfect stage for eating

Fruit 

ONLY UNRIPE FRUIT SHOULD BE EATEN.

Unripe fruit is light green, speckled, and firm or hard. 

Creeping cucumber fruits are ovate or occasionally  teardrop shaped. 

They are small, not more than an inch in length and half to 3/4 of an inch in diameter. They can be smaller, around the size of a jelly bean. 

Some say they resemble tiny watermelons, though I think they look closer to a small cousa squash. 

The one shown to the right is at the perfect stage for eating. Once they darken and soften, the spots will fade and the insides will start to become gelatinous (see below). They will eventually become near-black. 

These fruits are too mature and will have
a dangerous laxative effect if consumed

Ripe fruits are powerful laxatives, eating them will result in the urgent need to painfully defecate and can potentially lead to dangerous dehydration and even muscle spasms. 

Eating creeping cucumber

Creeping cucumbers are fun to pick and are famously popular with young children who grow up in the states where they are native. 

The unripe, light green fruits taste similar to cucumbers, though I personally think they are closer to the white parts of watermelon rind. They are crisp and slightly juicy, and their best application is probably tossed into a salad. If you find a large amount you could also pickle them. 

Creeping cucumber nutrition

Creeping cucumber is generally ignored by American publications, but has been analyzed by Mexican authorities. Unfortunately, these publications are in Spanish, which I can't read or speak. 

However, according to "Green Dean", famous forager and author of the Eat the Weeds website, who had a friend translate the study, the caloric nature of unripe fruits are made up of 56.8% carbohyrdate, 16.30% fiber, and a surprising 12.6% protein. They are also good sources of vitamins and minerals, though which ones specifically aren't mentioned in the original publication I found, at least not the part that has been translated into English. It is possible they are similar to cultivated cucumbers, which means they would primarily have vitamin C and potassium. 

Unfortunately, the small size of these fruits makes their nutritional value rather limited, unless they could be cultivated to be much larger. 

Medicinal applications - don't

Despite the ripe fruit being a powerful laxative, it is important that you do not attempt to use creeping cucumber medicinally. The native peoples of the Americas were well-aware of this plant and yet no record of it being used medicinally has been found. This is likely due to how very powerful it is. It would be difficult to find a way to safely use this plant--and attempts could result in dangerous cramping and dehydration. 

Edible Giant Ragweed Foraging and Identification

Latin name: Ambrosia trifida & Ambrosia trifida var texana 
Common name: Giant ragweed & Texas giant ragweed 
Season: Early spring through early fall
Edible: Yes, seeds, greens, buds, and flowers. But see potential toxicity warning below
Flavor: Fair 
Medicinal: Possible
Nutritional: protein and fats for the seeds, presumably standard green nutritional values for greens
See below for information regarding allergies and potential toxicity 

Identification difficulty: Novice when mature, Intermediate when young

Identification note: If you live in a region where giant hogweed, Heracleum mantegazzianum, is known to grow, pay especial attention to the look-a-likes section of this article. Giant hogweed is deadly poisonous and can cause blindness and chemical-like burns from simple contact. 

Please note, I am honestly not sure if the images I have here are for giant ragweed, A. trifida, or its subspecies, the Texas giant ragweed, A. trifida var. texana. The share edibility and identification features. 

Giant ragweed distribution

Giant ragweed is a native North American plant found throughout most of southern Canada, 47 of the 48 continental United States (comically avoiding Nevada), and southern and central Mexico. It has been introduced and become invasive throughout much of Europe, parts of the Middle East, and east, southeast and northeast Asia. As always, my guides are intended only for readers in the United States, as I don't know about look-a-like species in other parts of the world. 

Giant ragweed and allergies

Ragweed pollen is second only to mold when it comes to the likelihood of triggering allergies in humans. Ragweed is generally the true cause of so-called "hay fever" in the late summer and fall, though this often gets attributed to goldenrod, or, well, hay. 

For anyone who has a high sensitivity to pollen-related allergies, asthma or any other raspatory disorder, I would advice avoiding this plant when it's flowering, including not consuming ragweed flowers. While it is possible that consuming ragweed pollen might help build immunity, there is no clear evidence backing that AND it's pretty much impossible to gather and use without inhaling a significant amount of pollen. Marie Viljoen of Gardenista recommends wearing a mask. I recommend foraging it before it begins pollination, so in late May, June or early July. 

In large part due to climate change, the range of introduced ragweed is spreading rapidly. Ragweed also produces more pollen in warmer years, increasing the allergy risk with global warming. 

Do an allergy test before consumption

Despite the high incidence of allergies to the pollen, what we know about the greens indicates they are safe for most people. Still, I would definitely start with a small amount at first and if you have ragweed pollen allergies, even do an allergen test on the greens before eating them. An allergen test involves grinding up a few leaves into a paste using a mortar and pestle. Then rub the paste over the inside of your elbow. Allow to sit for around 2 minutes then rinse off. Wait up to 5 days and see if the area develops any reaction, such as redness, blistering or itch. If you see any reaction, do not eat this plant, even in small amounts. Of course, if you have a severe reaction, even to a skin test, consider seeking out immediate medical attention. 

Giant ragweed history as a food crop

Seeds of a cultivated form of giant ragweed have been found in ancient sites of the Native Peoples of the Americas, most notably those of the southwest and plains states, including the Cheyenne, the Sioux and the Osage. 

These seeds are much larger than any that grow naturally, indicating that giant ragweed was important enough to prioritize size (and potentially nutritional content) when choosing which strains to cultivate. Despite some sources claiming that giant ragweed was merely ritual or medicinal in use, this focus on size would indicate food use. Other sources agree that giant ragweed was most likely cultivated for its seeds as a source of protein and fat. This cultivation goes back at least 2000 years, but ends between 500-800 years ago, most likely due to the spread of maize from the south. Maize (the precursor to corn) naturally grows larger and, while it lacks in protein and fat, it is higher in caloric value, due to being primarily carbohydrates. Additionally, the calories in maize are easier to utilize, since they do not require dehulling or winnowing.

Despite significant evidence of the seeds being eaten and even cultivated for larger yields, there is scant evidence that the greens were eaten, though many native tribes used them medicinally and/or ritualistically. Despite no clear history of human consumption, the foliage is desirable for most livestock.

Ragweed seeds make up an important part of the diet of game birds and migratory birds, small mammals and even larger mammals like deer.

Giant ragweed identification (mature plants)

A massive stand of giant ragweed, showing average mid-summer height of 4-6 feet

Plant size and location

• Usually by early summer, June through July, giant ragweed is best identified by it's impressive fully-grown size, when the plants will be anywhere from 5' - 7' tall. However, they start out small, almost like a groundcover plant. 
• Plants grow in a variety of conditions, including nearly full shade, but favor full or partial sun. Giant ragweed is a ruderal species, which means it likes to move in on disturbed soil. This means it's often found in creek bottoms and similar areas, but will also pop up where land has recently been cleared, such as for farming or construction. 

Depending on growing conditions and plant age, giant ragweed leaves vary greatly.

Leaf shape, size and texture

• Giant ragweed leaves are always large to extra large in size for the size of the plant. Even when the plant is young, they will be over 4" long and 3" wide. When the plant is mature they will be between 8" and 12" long and 8" and 10" wide. 
• Giant ragweed leaves are deeply lobbed. When young, the plants may only have 3 lobes but as they mature they should have 5, though sometimes the leaves at the top will still only have 3. 
• Giant ragweed leaves have a lot of variety in how they are lobed. Sometimes they resemble maple leaves, with the lobs going down about half the length of the leaf. Other times the lobes will cut much deeper, cutting almost to the center of the leaf. 
• The back of the leaves are silvery green in color and the underside of the leaf veins are covered in tiny hairs. This makes the leaf feel almost sandpapery underneath, its also why these greens should probably always be eaten cooked. The fine hairs can irritate the throat. 

Tiny hairs line the undersides of leaf veins. 

During the earlies spring weeks (March 7 here)
Giant ragweed leaves will look significantly different from the mature ones

Very early giant ragweed leaves

Identification of young plants (March - April)

Giant ragweed doesn't really start to bolt until mid to late spring, reaching around 3' - 4' tall by mid-April through May here in Texas. Before that, it stays small (under a foot) throughout March and early April. It even starts out looking like a groundcover. 

Very early in the season, the end of February through the first week of March here in north Texas, not only will giant ragweed be low to the ground, it will also almost never have any 5 lobed leaves, they will all be 3-lobed or even 2-lobed "mitten" shaped. 

By the middle of March the plants, while still groundcover height, will start to primarily growth their 5-lobed, mature leaf forms. Of course, these young plants will still have some 3-lobed leaves as even mature plants retain some of those. 

Same plants on March 18, you can see they are starting to grow a number of 5-lobed leaves.

How to identify and forage Texas wild mustard: bastard cabbage

Latin name: Rapistrum rugosum
Common names: Bastard cabbage, turnipweed, turnip weed, giant mustard
Season: Spring and early summer
Edible: Yes, entire above-ground plant
Flavor: Good to great
Nutritional: Yes, vitamins K, A, C, E and all the Bs, also copper and iron

Identification difficulty: Novice

Rapistrum rugosum, most commonly know as bastard cabbage, and less commonly as giant mustard, turnipweed or turnip weed, seems to be nothing more than a tall, cheerful yellow wildflower that paints Texas in swaths of color. 

But looks can be deceiving. 

Bastard cabbage is a wild mustard, (cabbage is in the mustard family), that gets it's common name from its highly invasive nature. Originally from Southern Europe, the Mediterranean and Northern Africa, bastard cabbage has spread to 17 U.S. states and has hit Texas particularly hard. 

Bastard cabbage has a deep, deep taproot that makes it hard to "root" out, (ha, ha, ha), and a habit of being one of the first things to flower in the spring, getting well-established before native plants can get a foothold. Indeed, it's rapidly displacing native wild flowers, like bluebonnets.

It's also edible and quite tasty when prepared correctly. So let's take a moment to get to know this invasive weed, you you too can try it!

Bastard cabbage identification 

Special note: Bastard cabbage is relatively easy to identify once its flowering, but can be more challenging before that. I recommend not harvesting this plant before flowering unless you have become fairly familiar with it, or are familiar with foraging mustards in general. 

After construction of apartment complexes, there are often
fields of bastard cabbage, which spring up in disturbed soil.

Location and season

One reason why bastard cabbage is so invasive is because it's one of the earliest greens we will see pop up in the season, usually by the first week of March hear in Texas. It gets a head-start on many native plants. 

Trails are another common place to find bastard cabbage.
Note the height and size of the mature plants.

Additionally, this is a ruderal species. That means that it's one of the first plants to get established if the ground is disturbed. In purely natural areas, disturbed ground is most common around creeks and in flood plains. But humans frequently disturb the ground for construction, road work, creating trails and pathways, in fields for seasonal farming, and for many other reasons. These are all good places to look for bastard cabbage--though don't eat it from near a highway or any other potentially contaminated area. It can also grow in and around trees that would usually provide too much shade for other plants, as bastard cabbage gets established before the trees leaf out.  

Plant size and shape

Bastard cabbage begins as a basal rosette, or a circular mat of leaves coming out from a central point, flat against the ground. Very quickly those leaves start to build up, creating a "fluffy" circle. 

When mature, plants will reach around 3' at the very tips of their flower stalks. They will be quite leafy for about 2/3 of their height, then be almost bare branches with just tiny leaves and flowers. The diameter of the leafy base will be between 1' and 2 1/2'. 

4-petaled yellow flowers in oval-shaped clusters

Flowers and fruits

The flowers are the most distinctive part of bastard cabbage, and I recommend not foraging them until they flower, at least not until you are quite familiar with the plant. 

Flowers are around 1/3 to 1/2 inch, bright yellow, have 4 petals in a cross shape. They grow at the ends of the central stalk or the ends of side branches in oval-shaped clusters.

Flowers appear by mid-spring (late March/early April in Texas) and the plant will generally be done flowering by late spring (May here in Texas). 

The flowers leave behind small, teardrop-shaped fruits, the size of a pencil lead, which will cling to the stalk until they ripen in to seeds. 

Stalk and branches

The stalk for bastard cabbage is light green and looks like it has textural striations along it. There aren't any red spots, though right before the plant bolts, the junction between the baby branches and the main stalk might look a little reddish or orangish. 

Right before the plant bolts the main stalk will have a green flower bud, and the baby branches will also have tiny buds (see the area circled in red). The stalk will be about 1/4" in diameter at this point. 

The branches are never directly opposite each other, they are always slightly offset vertically. But they will always alternate which side of the stalk they come off of. 

When the plant bolts (begins its reproductive phase), the central stalk will shoot up about a foot taller than the leafy base. The green buds will turn into yellow flowers, and the baby branches will grow out, making the whole plant multi-branched. 

When mature, the stalk will thicken to 1/2" or 3/4" in diameter and become a brighter, almost lime green. The branches can be grow to be 1/2" thick. 

Incredible variation in mature leaf shape, size, number of lobes, lobe size, and edge texture. 

Leaves

Bastard cabbage has some frustratingly complicated leaves. At the base of the plant and in the basal rosette, leaves will be quite large, from 8" to 12" long. They are often dark green and very wrinkly, but can also be medium green and unwrinkled. They have a long central mid-rib that is light green or white. 

The mature leaves are always deeply lobed, but sometimes those lobes can be more or less even in size and there can be many of them (above right), other times they can appear more as a spoon shape--with one giant lobe at the end of a long leaf stalk, with only tiny, barely noticeable lobes running along the stalk (above left). 

Just like leaf shapes, leaf edges also vary greatly. Edges will be scalloped, small toothed, large toothed (like a saw blade), wavy or even nearly smooth, though never fully smooth. 

To make things even more complicated, many of the smaller leaves near the top of the plant will be triangular or lanceolate and may or may not have any lobes. 

This is why it's important to use more features than just leaf shape at first. 

Many, but not all, mature leaves will have textural bumps.

Bastard cabbage plants will always have several leaves that are covered in tiny, textural bumps. But not EVERY leaf will have this feature. They are more common on mature leaves, and may be significantly less obvious than on the example above. 

Foraging and Identifying EDIBLE black nightshade berries

Latin Name: Solanum nigrum, Solanum americanum and Solanum ptychanthum
Common Names: Black nightshade
Season: Summer through mid fall (northern states/Canada), early summer through fall and early winter (southern states/Mexico)
Edible: Yes, ripe fruit (see note about young green leaves)
Flavor: Excellent 
Medicinal and nutritional value: Undetermined, probably similar to tomatoes 

Identification difficulty: Intermediate

Warning: The plants known as "black nightshades" are in the nightshade family, which has some infamously poisonous and deadly members, including deadly nightshade, Atropa belladonna. The plants we will be discussing today are more closely related to tomatoes and eggplants, and have fruit that is edible when FULLY RIPE and cooked. Unripe fruit has been known to be deadly poisonous, especially to children. Even though we will go over how to safely identify and forage these plants, especial care should be given whenever foraging the nightshade family, and you must consult with several reliable sources regarding identification and safe consumption of these plants. As always, this blog is intended as a guide, but not the sole guide. 

Nightshade. The very name is nearly synonymous in our cultural consciousness with poison. This is odd because, unless you have an allergy, there's a good chance that you eat nightshades most every day. 

Tomatoes, potatoes, yams, eggplant, sweet and spicy peppers, these are all fruits in the nightshade family that are readily eaten in North America and Europe. Central and South American countries frequently eat even a wider variety of nightshades, including groundcherries, tomatillos, and naranjilla. In Southeast Asia one could also find goji berries among the list of commonly eaten nightshades. 

The plants we are going to talk about today are members of the genus Solanum, specifically Solanum nigrum (European black nightshade, African black nightshade or Old-World black nightshade), Solanum americanum (American black nightshade, glossy black nightshade or new-world black nightshade), and Solanum ptychanthum (Eastern black nightshade or Indian black nightshade). The three species of black nightshades are in the same genus as tomatoes, (Solanum lycopersicum), potatoes, (Solanum tuberosum), and eggplants/aubergines (Solanum melongena). 

Collectively, these plants are called black nightshades in North America, a name which encourages confusion and fear with another black-fruiting nightshade called deadly nightshade, or Atropa belladonna. In Europe, these species are sometimes known as garden huckleberries, but the name huckleberry refers to a completely different plant, related to blueberries, in North America. 

In honor of spooky season, I thought it would be fun to share this post in October. Happy Halloween, everyone!

Black nightshade caution and controversy

I'm trying to get more confident at identifying
black nightshades at this young stage so that I may 
try the cooked young leaves. 

There are many sources, including some very official ones, that will tell you that the fruit of black nightshade plants is poisonous. Many state websites state that the ripe fruit is less poisonous than the other parts of the plant, but poisonous nevertheless. Some people say they eat the ripe fruit raw, and still others say it must be cooked. 

Additionally, there are many sources which will tell you that the young leaves and stems are edible cooked and used as a pot-herb in many parts of the world. Still other sources will tell you that the plants may be edible in say, Africa, but become poisonous in North America. There is also the possibility that these nightshades might hybridize with other members of the genus Solanum, and that's why people have found poisonous leaves. . .

So what to believe? Well, I don't know everything, so I am only sharing with you here what I DO know. and that is that I have eaten the fully ripe, black berries, both completely raw and fully cooked and have suffered no ill effects. I have not eaten the young green leaves, but if I do I will let you know. I will not make any statement I have not personally tried myself. 

That said, I would be willing to try young black nightshade leaves, as I trust the sources who say they are edible, but personally I find the young plants difficult to distinguish from other, potentially poisonous nightshades. The plants are hard to tell apart before the flower buds form, and once the flower buds do form, you shouldn't be eating the leaves any longer. 

Mature old-world black nightshade plant, Solanum nigrum, growing on my own property,
portion of a woman's size 10 foot (mine) for scale.
Plant is covered in flowers and both ripe and unripe fruit. 
Photo taken north of Dallas in late May.

Mature American black nightshade, Solanum americanum, growing in one of the most disgusting alleyways in downtown Dallas TX, and absolutely loving it.
Covered in flowers and fruit (I didn't eat, given the location).
This picture was taken in mid-December.

Black nightshade identification

A special note on identification

The three "black nightshade" plants are different but have overlapping features, which makes grouping them together into one ID post rather tricky. Solanum nigrum and Solanum americanum are the most different, and Solanum ptychanthum is kind of like a mix between both features. In fact, some speculate that S. ptychanthum might be a hybrid species from intermixing between the native and introduced plants. Regardless, I will do my best to specify which features are the same and which are different between the species. 

• S. nigrum, commonly known as black nightshade or European black nightshade is native to Eurasia but has spread throughout the Americas, Australia/Indonesia/New Zealand, and parts of Africa.
• S. americanum, commonly known as American black nightshade or glossy nightshade, is native to northern South America, Central America, the southern and west-coast states of the United States, and--surprisingly--Australia. It has spread beyond it's native range and can be found throughout the Americas, and has been introduced to many warm-climate regions of the world, including the Mediterranean and many parts of Africa. 
• S. ptychanthum, or eastern black nightshade is found throughout North America and into Central America. Whether it is native or not is debatable. If it is not native, it is debatable where it originated. There is speculation that it is a hybrid species between S. nigrum and S. americanum. Despite having a larger range than S. americanum, it is less commonly encountered than either of the above species. 

In my experience in the US, S. nigrum is far and away the most abundant of the black nightshades, followed by S. americanum (most abundant on the east coast), while S. ptychanthum is quite rare. Indeed, I am not 100% sure when I have identified it and that I wasn't actually finding a weird S. nigrum. 

S. ptychanthum leaves looking a bit more lanceolate than either other black nightshade, 
but with features that resemble the other 2, including some scalloped edges like S. nigrum,
but also some smoothness at the end of the leaf, like S. americanum.

Black nightshade plant and stem features

• Black nightshade is a weedy looking plant, not much more than 2 feet tall, often much shorter, and between 8 inches and 4 feet in diameter. 
• Black nightshade is multi-branching, and will grow stretched out where conditions are less than ideal, but will grow full and bushy where it has good soil and shade. 
• Black nightshade stems are green (S. americanum) or green with red/purple branch nodes (S. ptychanthum and S. nigrum). In some cases of heavy sunlight, S. nigrum and S. ptychanthum will have fully red-purple stems.
• Black nightshade will reach its full size somewhere in late spring, but will not fruit until summer.

Purple/red blotches at the stem joints of S. nigrum; also note the unripe fruit, (which is poisonous),
with calyxes that are smaller than the berry.

Scalloped leaves on S. nigrum; S. americanum has smooth leaf edges.

Black nightshade leaf features

• Black nightshade leaves are generally diamond-shaped or pointed-egg shaped. Leaves are shorter on the side attached to the petiole (leaf stem) and elongated after the widest part of the leaf. In poor growing conditions these leaves can be more lanceolate.
• S. nigrum leaves can be quite large when mature, as large as a deck of cards. These leaves will have large scallops on the leaf edges. S. nigrum leaves are a solid bright green to emerald green with a prominent central mid-vein. Veins branch off the mid-vein and angle forward to the leaf edge. 
• S. americanum leaves are around 1/3 to 1/2 smaller, not much larger than an extra-large chicken egg, at the largest. American black nightshade leaves are emerald green and may have a "mottled" light green pattern, like a turtle's shell. S. americanum leaves have a central mid-vein, and the veins that branch off angle forward, but they don't go to the leaf edge, instead they curve into the next vein. 
• S. ptychanthum leaves have features resembling both S. nigrum and S. americanum. 
• Leaves do NOT appear as a compound leaf, which is to say, they do NOT appear like multiple leaflets growing off a central leaf stem. (More on this later)
• Most black nightshade leaves are lighter on the underside than on the top, but only slightly. The undersides are definitely not silvery or white. S. ptycanthum, however, can have purple or dark grey on the underside of the leaf.

Both S. nigrum (left) and S. americanum (right) exhibiting what
I've termed "fractal threes" leaf growth. Many nightshades grow leaves like this.

"Fractal threes" leaf growth

Many plants in the nightshade family exhibit a leaf growth that I call "fractal threes" -- I'm not sure if there is a scientific name for the term. If you look at the image directly above, you will see that leaves grow in sets of 3, which then continually add in triads. 

The image of  S. nigrum (left) has 3 large leaves, but the 2 bottom leaves have grown 2 more leaves each, making them into new sets of 3. Additionally, the  2 smaller leaves on the top set each have tiny little leaves growing, again producing sets of 3. Unfortunately, many other nightshades, including poisonous ones, also exhibit this feature. 

Another detail of the repeating patterns of threes in nightshade leaf growth,
this example is S. nigrum

Black nightshade flower features

• Black nightshade flowers have WHITE petals with yellow centers. Petals are not yellow, and especially not purple, blue, pink or burgundy. 
• Black night shade flowers have 5 petals, arranged like a traditional star--NOT a bell or tube.
• The petals of black nightshade flowers are straight at first, but eventually bend backwards, making the flower resemble a firework.
• The yellow anthers, at the center of the petal cluster, are quite prominent and stick out significantly. 
• Flowers grow in clusters, where each flower is on a stem, but the stems come together at a single point attaching to the branches. Together the flower stems bow slightly, reminding me of the ribs on an umbrella. 
• Flowers do not grow individually, nor do they grow in a line

Focus on the calyxes

Black nightshade calyx features

The calyx is a "whorl" or "crown" of sepals (flower parts) after the flower has seemingly died away. The calyx is most often green and will resemble a leaf formation to the untrained eye. The calyx appears on top of the fruit, where the fruit stem attaches. 

• Black nightshade berries have 5-part calyxes that are SMALLER than the diameter of the berry, and curve backwards towards the fruit stem. 
• The calyx looks like leaves forming a crown at the top of the berry.
• Black nightshade calyxes are green/dark green and not purple or reddish
• Calyxes are rounded on the ends, or come to soft points; they do not come to long, sharp points that look like daggers or claws.

S. nigrum fruit showing green fruit, partially ripe red/green fruit and 
fully ripe black fruit. Only the ripe fruit should be eaten.

Black nightshade fruit features

• Black nightshade fruits in summer and fall, into winter in the Southern United States. The plant will frequently have both flowers and fruit on it at the same time, helping with identification. 

• 

  Unripe fruit, which is poisonous, should not be eaten

  Black nightshade fruits are green when unripe and black* when ripe.
• Fruit ripens from green to dark green to purple-green to black. It never has a yellow, orange or red phase. If you find fruit in these colors you have the wrong plant.
• Fruit is small, slightly smaller than a pea (1cm/.4 of an inch) for S. americanum and S. ptychanthum, and slightly larger than a pea for S. nigrum. When green, fruit is the size of a pencil eraser. 
• Berries are shiny/glossy for S. americanum, and matte or dull for the other two species of black nightshade.
• Berries grow in clusters, NOT INDIVIDUALLY. The clusters hang from fruit stems, all of which come together at one point. The fruit also does not grow in a line. 
• Ripe black nightshade fruit are filled with tiny seeds that surround a central core (rather like a tiny tomato). Between the seeds the flesh is juicy and translucent, like a grape but softer and purple. 

* Some varieties produce reddish-orange fruits, but these do not grow in North America, and should not be eaten if found unless you trust a local expert to identify them for you. 

Very young black nightshade

Very young black nightshade leaves are edible, but resemble far too many other members of the nightshade family, including poisonous or deadly species. I currently avoid young nightshades and recommend the same for anyone who isn't very experienced.