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Datura L.

Sp.Pl. 2:179 (1753)
Name Status

Scientific Description

Common name. Thornapples. Family Solanaceae.

Habit and leaf form. Shrubs, or herbs; resinous, or not resinous. Plants unarmed (apart from the fruit). Annual, or perennial; plants with neither basal nor terminal concentrations of leaves. Stem internodes solid. Helophytic to xerophytic. Leaves alternate; spiral; ‘herbaceous’, or leathery; petiolate; non-sheathing; not gland-dotted; without marked odour, or foetid; simple; epulvinate. Leaf blades dissected, or entire; pinnatifid; pinnately veined; cross-venulate. Leaves without stipules. Leaf blade margins entire (and sinuate). Leaves without a persistent basal meristem. Leaf anatomy. Hairs present, or absent; glandular hairs absent, or present. Branched hairs absent. Extra-floral nectaries absent.

Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite. Entomophilous.

Inflorescence and flower features. Flowers solitary; terminal (or in the forks of stems or lateral — i.e. leaf-opposed or displaced); pedicellate; ebracteate; ebracteolate; medium-sized to large; regular; 5 merous; cyclic; tetracyclic. Free hypanthium absent. Hypogynous disk present; intrastaminal. Perianth with distinct calyx and corolla; 10; 2 -whorled; isomerous. Calyx present; (3–)5(–9); 1 -whorled; gamosepalous; shortly blunt-lobed; tubular, or urceolate; regular; persistent; non-accrescent. Corolla present; 5; 1 -whorled; gamopetalous. Corolla lobes markedly shorter than the tube. Corolla contorted and plicate; funnel-shaped; regular; green (tube), or white (throat translucent white or coloured). Androecial members definite in number. Androecium 5. Androecial members adnate; all equal; free of one another; 1 -whorled. Androecium exclusively of fertile stamens. Stamens 5 (usually). Staminal insertion near the base of the corolla tube, or midway down the corolla tube. Stamens all inserted at the same level; remaining included (or only slightly exserted); all more or less similar in shape; isomerous with the perianth; oppositisepalous (in lower half of the corolla tube). Filaments appendiculate, or not appendiculate; filiform. Anthers connivent, or separate from one another; basifixed; dehiscing via longitudinal slits; introrse; bilocular; tetrasporangiate. Pollen shed in aggregates, or shed as single grains. Gynoecium 2 carpelled. The pistil 2 celled, or 4 celled. Gynoecium syncarpous; synstylovarious to eu-syncarpous; superior. Ovary plurilocular; 2 locular (above), or 4 locular (below, by equal secondary divisions from the placentae). Locules secondarily divided by ‘false septa’. Gynoecium oblique. Ovary sessile. Gynoecium stylate. Styles 1; attenuate from the ovary; apical. Stigmas 1; 2 - lobed (L). Placentation axile. Ovules 20–50 per locule (numerous); non-arillate; anatropous, or hemianatropous.

Fruit and seed features. Fruit non-fleshy; spinose (or tuberculate); dehiscent; a capsule. Capsules valvular, or splitting irregularly (regularly by 4 valves or irregularly from the apex). Fruit 2–4 celled; 20–100 seeded (usually numerous, several). Seeds endospermic. Endosperm oily, or not oily. Cotyledons 2. Embryo curved (through more than a semicircle).

Etymology. From the Hindi Dhatura; name of D. fastuosa.

J. Gathe and Leslie Watson, 8 September 2016

Taxonomic Literature

  • Wheeler, Judy; Marchant, Neville; Lewington, Margaret; Graham, Lorraine 2002. Flora of the south west, Bunbury, Augusta, Denmark. Volume 2, dicotyledons. Australian Biological Resources Study.. Canberra..
  • Wheeler, J. R.; Rye, B. L.; Koch, B. L.; Wilson, A. J. G.; Western Australian Herbarium 1992. Flora of the Kimberley region. Western Australian Herbarium.. Como, W.A..
  • Marchant, N. G.; Wheeler, J. R.; Rye, B. L.; Bennett, E. M.; Lander, N. S.; Macfarlane, T. D.; Western Australian Herbarium 1987. Flora of the Perth region. Part one. Western Australian Herbarium.. [Perth]..
  • Australia. Bureau of Flora and Fauna 1982. Flora of Australia. Volume 29, Solanaceae. Australian Govt. Pub. Service.. Canberra..
  • Grieve, Brian J.; Blackall, William E. 1982. How to know Western Australian wildflowers : a key to the flora of the extratropical regions of Western Australia. Part IV. University of W.A. Press.. [Perth]..