RAUWOLFIA
rauwolfia, rauvolfia
(noun) any shrub or small tree of the genus Rauwolfia having leaves in whorls and cymose flowers; yield substances used medicinally especially as emetics or purgatives or antihypertensives
rauwolfia
(noun) any of several alkaloids extracted from the shrub Rauwolfia serpentina
Source: WordNet® 3.1
Etymology
From the genus name.
Noun
rauwolfia (plural rauwolfias)
Any of several small trees and shrubs, of the genus Rauwolfia, that yields materials of medical use.
Any of a group of alkaloids extracted from these trees.
Source: Wiktionary