CRUDE DRUGS. 



553 



rneth}'! ether, phloryl isobutyrate and formic and butyric acids. 

 Arnica rhizome also contains about lo per cent, of inuHn. 



Fig. 242. Matricaria: A, longitudinal section of head showing torus (a), involucre 

 (b), ray florets (c) and disk florets (d). B, head with the florets removed, showing the long 

 conical torus and the involucre (H). C, tubular floret showing the ovary (f) with glandular 

 hairs (D^) and the embryo (S), which develops after fertilization; style (g) and bifid stigma 

 (N), the surface of which is covered with hairs; n, nectaries; b, corolla tube with narrow 

 lobes (a); stamens showing filaments (st), united anthers (A) and apex of connective (sp). 

 D, ligulate floret showing ovary (F), and bifid stigma (N); tube of corolla (R) and the 

 upper ligulate portion (Z). After Meyer. 



MATRICARIA. WILD OR GERMAN CHAMOMILE. 

 The flower-heads of Matricaria ChamomiUa (Fam. Compositse), 

 an annual herb (p. 394), indigenous to Europe and Western Asia, 

 and naturalized in Australia and certain parts of the United States, 



