MILKWEED FAMILY 



195 



hood-like appendages, each with an incurved horn borne on 

 the stamen tube and forming a crown around the stigma 

 (Fig. 27, A) ; anthers pressing against the lobes of the stigma ; 

 the pollen clinging together in tough, waxy or fine-grained 



hn --=*- 



D 



FIG. 27. Flower of Asdepias syriaca 



E 



A, entire flower; B, vertical section; C, diagram; D, details of pollen-masses 

 and glands, ca, calyx ; c, corolla ; hd, hood ; hn, horn ; a, anther ; s, stig- 

 ma ; o, ovary ; g, gland ; p, pollen-mass. (All considerably enlarged.) 



masses. Ovary free from the calyx tube, of 2 carpels, more 

 or less united below but unconnected above ; styles 2 ; stigmas 

 5-angled ; ovules several-many. Fruit consisting of 1 or 2 

 pods. The flowers are very highly specialized for pollination 

 by insects (see below, under Asdepias). 



