Common Honeysuckle [image credit: iStock] 3. The name says it all — both the foliage and the berries of this plant are extremely toxic. Poisonous to Humans Problem for Cats Problem for Dogs Problem for Horses; Poisonous to Humans: Poison Severity: Low Poison Symptoms: vomiting, diarrhea, loss of consciousness, seizures Poison Toxic Principle: Cardenolides, alkaloids Causes Contact Dermatitis: No Poison Part: Bark Flowers Fruits Leaves Roots Sap/Juice Seeds Stems This vine is invasive in parts of North America. The wild birds eat the berries and distribute the seeds around in their poop. According to the US Department of Agriculture the American Bittersweet (Celastrus scandens) plant has a toxicity level of “None”. These fruits are poisonous to humans when ingested, but are favorites of birds. Solanum dulcamara is a species of vine in the potato genus Solanum, family Solanaceae.Common names include bittersweet, bittersweet nightshade, bitter nightshade, blue bindweed, Amara Dulcis, climbing nightshade, fellenwort, felonwood, poisonberry, poisonflower, scarlet berry, snakeberry, trailing bittersweet, trailing nightshade, violet bloom, and woody nightshade. Melanie Shaw / Flickr / CC BY-ND 2.0. The fruit and seeds have a somewhat confirmed history of being mildly toxic for humans, while rabbits, squirrels and birds can eat them with impunity. American bittersweet is the only species of Celastrus native to North America. Oriental Bittersweet [image credit: iStock] 2.   Many yards across North America have some bittersweet nightshade weeds growing in them, typically along a fence. 1 Oriental Bittersweet (Celastrus orbiculatus) The flowers, fruits, and seeds are poisonous to humans, cats, and dogs if ingested. Here are 10 tasty wild berries to try — and 8 poisonous ones to avoid. These vines all have very recognizable leaves, but importantly for winter identification, they also all have tendrils on their vines. Celastrus orbiculatus is a woody vine of the family Celastraceae. The flowers, fruits, and seeds are poisonous to humans, cats, and dogs if ingested. Many berries are commonly available in grocery stores, but other, equally delicious ones are abundant in the wild. Rabbits and deer browse the leaves and stems. Similarly, is Bittersweet poisonous to humans? Here’s some common plants with poisonous berries. While not as toxic as its cousin belladonna, bittersweet nightshade is poisonous to pets and can be deadly to children who eat its brilliant red berries. Bittersweet fruits are eaten by eastern cottontails and fox squirrels, and by at least 15 species of birds, including wild turkey, ruffed grouse, and northern bobwhite. The berries contain cardiogenic toxins—the most poisonous part of the plant—which can have an immediate sedative effect on cardiac muscle tissue. Ingestion of the berries can lead to cardiac arrest (heart attack) and death. There are three other common vines in our forests: Virginia creeper, woodbine (often confused with Virginia creeper) and poison ivy. Common Honeysuckle (Lonicera poericlymenum) Berries are poisonous if ingested. The scientific name for this plant is Celastrus scandens. All parts of the plant can be toxic to humans … It has colorful, orange fruits that are the size of a pea. Bittersweet nightshade belongs to the nightshade family, which is known for being poisonous. Older bittersweet vine bark is sometimes confused with ash tree bark. 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