REPRODUCTION. 



221 



Among the Umhelliferce as well as the Composites the flowers of 

 the same inflorescence {umbel, head) are often different ; the central 

 ones are actinomorphic and the peripheral ones zygomorphic. 

 Among the Compositm there are distinct strap-shaped and tubular 

 flowers, or even two-lipped flowers, in place of the former. Fig. 

 146, Z", shows the involucre of hypsophyllary leaves ; m, a ttobular 

 bisexual flower; r, a sterile tivo-Upped marginal flower; 5, the 

 rece]3tacle; M, a hypsophyllary leaf; /*, ovary; g, style with 

 stigma; ^ and 6-5, filaments with united anthers. The Umhelliferm 

 are distributed through the temperate zone and comprise about 



Fig. 147. — Aethusa cynapium. 

 a. Umbel; c, flower; e, fruit; /, cross-section of the fruit; g, leaf. (After Krass and Landois.) 



1300 species (Eichler). Figs. 1-1:7-119 are given to represent the 

 general characteristics of this familv. 



The dicotyledons are now usually divided into Chonpetalce and 



