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488 PHARMACEUTICAL BOTANY 
Fic. 364.—Acorus Calamus, the Sweet flag, a member of the Aracee. (Sayre.) 
Fic. 365.—Diagram of A, lily flower, and B, grass flower, showing homologous 
structures. A, f, bract; ax, axis; op, outer perianth; i, inner perianth; s, stamens; 
(c) tricarpellary ovary. B, shaded structures are aborted; /], lemma (bract); ax, 
axis; and p’, palet (outer perianth); / and /’, lodicules (inner perianth); s and s, 
two whorls of stamens; ¢, tricarpellary ovary. (A, Robbins. B, after Shuster.) 
