Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Michael Nee

Annual to shrub
Leaves generally simple, generally alternate, generally petioled; stipules 0; blade entire to deeply lobed
Inflorescence various
Flower bisexual; calyx lobes generally 5; corolla ± radial, cylindric to rotate, lobes generally 5; stamens 5, alternate corolla lobes; ovary superior, generally 2-chambered, style 1
Fruit: berry or capsule, 2–5-chambered
Genera in family: 75 genera, 3000 species: worldwide, especially ± tropical; many alien weeds in CA; many cultivated for food, drugs, or ornamental (potato, tomato, peppers, tobacco, petunia); many TOXIC.



Annual to subshrub, ± glabrous or hairs simple, ill-smelling
Leaf entire to deeply lobed
Inflorescence: flowers solitary in branch forks
Flower: calyx circumscissile near base, leaving a ± rotate collar in fruit; corolla funnel-shaped, white or purplish, lobes 5(10); filaments attached below middle of corolla tube; ovary 2- or 4-chambered
Fruit: capsule, leathery or ± woody, generally prickled; valves 2–4, or indefinite
Seeds ± flat, black, brown, grayish brown, or tan
Species in genus: ± 13 species: warm regions, especially Mex
Etymology: (Hindu: ancient name)
All species. HIGHLY TOXIC; several ornamental, some source of drugs.


D. stramonium L.


Annual < 10 dm
Stem ± glabrous
Leaf 5–15 cm, 4–10 cm wide, ovate, coarsely toothed to shallowly lobed
Flower erect; calyx 3.5–4.5 cm, angled toward base, lobes 5–7 mm; corolla 6–9 cm, glabrous, white or pale blue-purple, lobes 8–10 mm, spreading, tips long, narrow; filaments 22–25 mm; anthers 3.5–5 mm; style 4–6 cm
Fruit 4-valved, erect, 25–35 mm wide, glabrous; prickles 3–10 mm, upper > lower
Seeds 3–3.5 mm, black
Chromosomes: n=12
Ecology: Sandy soils, open, often disturbed areas
Elevation: < 1500 m.
Bioregional distribution: California Floristic Province (except Klamath Ranges, Cascade Range, High Sierra Nevada)
Distribution outside California: to eastern US; native to Mexico
Synonyms: var. tatula (L.) Torr

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bioregional map for DATURA%20stramonium being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Datura stramonium
Retrieve dichotomous key for Datura
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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