Jimsonweed, Datura stramonium
Stems stout, erect, 90-200cm high, usually much-branched in the upper part, smooth and hairless. Larger plants will have a main stem often 5cm or more in diameter.
Cotyledons (seed leaves) are narrow and about 2-4cm long, shriveling but persisting on the developing seedling. The first true leaves are ovate with pointed tips and few or no lobes. Later leaves distinctly alternate (1 per node), usually somewhat coarsely and sharply toothed or lobed, 10-20cm long and long-stalked.
Flowers and Fruit
Flowers and seedpods short-stalked, borne singly in the angles between 2 or more stems and a leaf. The calyx is tubular or urn-shaped. The corolla is white or light purple, very long, tubular or trumpet-shaped, 7-10cm long with the flared end having 5 points. The seedpod is at first green and fleshy with sharp, soft spines, becoming a large (2-5cm across), dry, hard seedpod covered with very sharp, harsh spines and containing numerous black, flat, round seeds. Flowers from July to autumn.
Jimsonweed occurs in the warmer parts of southern Ontario in cultivated fields and around farmyards.
It is distinguished by its tall, stout, branched stem (like small trees), large leaves, large, white or purplish trumpet-shaped flowers, large spiny seedpod and sour repulsive odour.
All parts of the plant are poisonous.
Human Health Issues
All parts of the jimsonweed plant are poisonous and are fatal if consumed in high quantities. Its toxicity is caused by tropane alkaloids.
Jimsonweed. A. Top of flowering plant. B. Seedling. C. Fruit.
linear cotyledons of Jimsonweed
A young seedling plant.
Large seedling plant prior to flowering.
The poisonous seeds of Jimsonweed
Table of Contents
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Plants With Spiny Seedpods & Flowers
Curious nature lovers regularly find unusual plants poking up in their own yards or those of their friends and family. A striking vegetative combination like spiny seedpods and flowers is bound to get the attention of an onlooker. Whether you’d like to add more of your newfound plant to the landscape or obliterate it completely, it helps to know what kind of plant you’re dealing with. Several plants sport spiny seedpods and flowers.
Datura innoxia and Datura stramonium are both ornamental plants that grow in Sunset’s Climate Zones 8, 9 and 11 through 31. These 3- to 6-foot-tall perennials boast large, trumpet-shaped flowers and spiny seedpods. Daturas are night-bloomers that release a perfume into the moonlit garden when planted as part of a landscape. Sometimes confused with moonflower, Daturas are in no way related. Datura is a bushy plant related to imsonweed, where moonflower is a climbing vine related to the sweet potato and morning glory. Many Datura plants are poisonous, so take caution in selecting their permanent locations.
Castor Oil Plant
The most dominant feature of castor oil plant (Ricinus communis) is the mass of round, spiny seedpods that erupt after its white stalk-borne flowers begin to fade. In Sunset’s Climate Zones 23 through 28, H1 and H2, it can overwinter and grow into an impressive treelike plant. The rest of the country enjoys the unmistakable castor oil plant’s large lobed foliage during the growing season and sacrifice it to the winter, treating it as an annual in plantings. This plant’s seeds are the source of castor oil, although it is not recommended that you attempt to press your own.
Wild cucumber (Marah macrocarpus) is a beautiful native plant related to gourds, squash, cucumbers and melons. This perennial vine emerges yearly from a massive fleshy tuber and scrambles rapidly before setting delicate, white fuzzy flowers in clusters. The 4-inch-long, egg-shaped seedpod hardens into a spiny fruit containing several black seeds. Although once used as marbles and jewelry by Native Americans, the seeds are bitter and poisonous.
Prickly poppy (Argemone mexicana) thrives with abuse and reseeds itself readily when given the opportunity. The only parts of this 3-foot-tall poppy that aren’t covered in spines or sharp edges are the 1 1/4-inch-wide yellow flowers. Although treacherous, this poppy is often grown in Sunset’s Climate Zones 7 through 43, 2A, 2B, 3A, 3B, H1 and H2. The seeds germinate readily, often when one of the spiny seedpods drops to the ground and shatters.
Other plants with spiny seedpods and flowers that grow wild could be either puncturevine (Triblus terrestis) or California burclover (Medicago polymorpha). Both are considered weedy plants in many Western states. Puncturevine is mat-forming weed with small, oval-shaped leaves on long stems that generally lie along the ground. It sports small yellow flowers and produces razor sharp, spiny seedpods that can puncture bicycle tires. California burclover is a member of the pea family and strongly resembles white clover. However, its three-part leaf is made of three small leaflets, each held on its own short stem. California burclover can grow up to about 2 feet, but generally lies along the ground. Flowers are small and yellow, eventually giving way to seedpods with two or three rows of prickly hooks.
What Weed Has a Round Prickly Seed Pod?
Datura, a night-blooming flower sometimes raised in home gardens, is also known as Jimsonweed or Thornapple (Datura stramonium). Jimsonweed is a contraction of Jamestown and is the name that early settlers and British soldiers gave the plants. Thornapple is an appropriate common name because it aptly describes the round, prickly seedpod that develop after the spent flowers fall off the plant. The prickly seedpods prevent animals from eating the toxic seeds.
Jimsonweed grows to heights of between 1 and 5 feet. Its leaves’ edges are toothed edges and nearly egg shaped with pointed ends. Their length ranges from 2 to 8 inches. Funnel-shaped flowers are 2-1/2 to 4 inches long and open to a trumpetlike bell in white, violet or lavender. The plant’s fruit is a spiny pod measuring roughly 2 inches in diameter. The seedpods grow as they ripen and the seeds mature. Ripe seedpods burst open, scattering the seeds.
- Jimsonweed grows to heights of between 1 and 5 feet.
- Its leaves’ edges are toothed edges and nearly egg shaped with pointed ends.
Most species are low-growing, shrublike or spreading perennials or are prolifically reseeding annuals. D. wrightii is the species that is common to the Western United States. Rank-smelling leaves and large, white flowers that are occasionally tinged with purple characterize this plant. A sprawling perennial, the plants have enormous taproots that may extend deeper than 2 feet into the ground. Its geographic range extends from California to Utah, Arizona, New Mexico and into Texas. D. wrightii is considered a cosmopolitan annual weed that seeds prolifically. D. discolor is a native species found in riverbeds and desert washes in Arizona and southeastern California. It has smaller flowers. D, stramonium is naturalized throughout the United States. D. stramonium is distinguished from D. wrightii because the plants have smaller flowers and a more erect growing habit.
- Most species are low-growing, shrublike or spreading perennials or are prolifically reseeding annuals.
- D. discolor is a native species found in riverbeds and desert washes in Arizona and southeastern California.
The contraction of “Jamestown weed” is the origin of the name Jimsonweed. Soldiers and settlers were poisoned after eating the plant’s leaves in salads. Long ago in India and Russia, robbers would grind up the seeds of Jimsonweed and mix them with water as a way to sedate, induce amnesia or daze people they intended to victimize and rob. Members of the ancient Indian religious order that worshipped Kali, the goddess of destruction, would also grind the seeds and feed them to people before robbing and/ murdering them. In China, Jimsonweed was prescribed for the sedative effects, for foot diseases and used for flatulence.
All parts of Datura or Jimsonweed are poisonous. Keep places where livestock graze free of the plant. Ridding an area of plants is difficult and time consuming because of the ease with which seeds spread. Some people may experience skin irritation from contact with these plants, so wear protective clothing or gear. Symptoms of Jimsonweed poisoning include blurred vision, confusion, dilated pupils, dry mouth, difficulty urinating, hallucinations and tachycardia. Although it rarely causes death, later signs of toxicity may include coma and seizures. Emergency medical attention is necessary in cases of suspected Jimsonweed poisoning. Poisoning is treated with activated charcoal and gastric lavage. Severe sinus tachycardia is treated with beta-blockers.