| senna | 1. <medicine> The leaves of several leguminous plants of the genus Cassia. (C. Acutifolia. C. Angustifolia, etc). They constitute a valuable but nauseous cathartic medicine. 2. <botany> The plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies. Bladder senna. <botany> The Cassia Marilandica, growing in the United States, the leaves of which are used medicinally, like those of the officinal senna. Origin: Cf. It. & Sp. Sena, Pg. Sene, F. Sene; all fr. Ar. Sana. Source: Websters Dictionary (01 Mar 1998) |
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| plant leaves | Expanded structures, usually green, of vascular plants, characteristically consisting of a bladelike expansion attached to a stem, and functioning as the principal organ of photosynthesis and transpiration. (12 Dec 1998) |
| polymorphic leaves | Two or more different types of leaves on plants, in wetland plants, polymorphic leaves may develop due to extended flooding. (09 Oct 1997) |