Similar Species
Datura inoxia is quite similar to Datura metel, to the point of being confused with it in early scientific literature. D. metel is a closely related Old World plant for which similar effects were described by Avicenna in eleventh century Persia. The closely related Datura stramonium differs in having smaller flowers and tooth-edged leaves, and Datura wrightii in having wider, 5-toothed (instead of 10-toothed) flowers. Datura inoxia differs from D. stramonium, D. metel & D.fastuosa in having about 7 to 10 secondary veins on either side of the midrib of the leaf which anastomose by arches at about 1 to 3 mm. from the margin. No anastomosis of the secondary veins are seen in the other 4 major species of Datura.
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