550 PHARMACEUTICAL BOTANY 
OrriciAL DruG PART UsEep BOTANICAL ORIGIN HABITAT 
Senega Root Polygala Senega United States and 
Canada 
EupHorBIACEZ OR SpurGE Famity.—Often herbaceous, 
more rarely shrubby, rather seldom arborescent plants. Stem, 
leaves and other parts in several genera traversed by latex canals 
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Fic. 418.—The Castor Oil plant (Ricinius communis). (From Strasburger after Baillon.) 
that are either ramifying cells (Euphorbia) or laticiferous vessels 
(Manihot, Hevea, etc.) or rows of laticiferous sacs (Micrandra) 
and contain a white latex with acrid often poisonous contents 
or alkaloid or hydrocarbon, at times, rubber contents. Leaves 
alternate, exstipulate to stipulate, simple to pinnate or palmate. 
Inflorescence cymose. Flowers usually, as in Ricinus, etc., 
