Datura L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 200

14. Datura L. 2

Erect annuals. Leaves alternate, simple, shortly petiolate. Flowers actinomorphic, solitary, axillary. Calyx tubular, often 5-angled, 5-dentate, circumscissile after flowering, the lower part persistent. Corolla tubular or infundibuliform; limb 5(10)-lobed. Stamens 5, equal, included or exserted, inserted near base of corolla. Stigma 2-lobed. Ovary 2-locular, sometimes 4-locular at base. Fruit a capsule, dehiscing regularly by 4 valves or irregularly.

Literature: A. G. Avery, S. Satina & J. Rietsema, Blakeslee: The Genus Datura . New York. 1959. W. E. Salford, Jour. Washington Acad. Sci. 11: 173-189 (1921).

1 Corolla at least 11 cm; capsule nodding, dehiscing irregularly

3. innoxia 1 Corolla not more than 10 cm; capsule erect, dehiscing regularly 2 Calyx-teeth usually 5-10 mm, unequal; capsule with rather

slender, ± equal spines not more than 15 mm, rarely

smooth 1. stramonium 2 Calyx-teeth 3-5 mm, subequal; capsule with stout, conical,

unequal spines 10-30 mm, the upper longer than the lower

2. ferox