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A TEXT-BOOK OF BOTANY. 



times the inflorescence may be decompound or complex, as in 

 several Composite, where the heads may be arranged in cymes 

 or racemes ; or, as in the Graminese, where the spikelets, which 



D 



FIG. 228. 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 1 ) 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. 



are spikes, may be arranged in panicles, i.e., branched racemes ; 

 or finally, as in Cryptotaenia (Umbelliferae), where the umbels 

 are arranged in cymes. 



