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, Ay, anthers pressing against the lobes of the stigma ; 

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



hn ^--^^^ « 



Fig. 27. Flower of Asclepias syrlaca 



A, entire flower; B, vertical section; C, (lia,ii:ram ; D, details of pollen-masses 

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

 ma; 0, ovary; g, gland; p, pollen-mass. (All considerably enhirged.) 



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 highl}^ specialized for pollination 

 by insects (see below, under Asclepias). 



