70 



The anthers when mature, shed their pollen into the hollow 

 cylinder. The tips of the lobes of the style are furnished 



FIG. 27. 

 Fig. 27, Yarrow {AchiU&a miUefnlium) ; 1, head from above ; o, stigmas ; 6, 

 stigmas of disk flowers; c, auttier cylinders in their first stage ; d, about to 

 opeh; 2, flower of disk just opening; e, ovary ;/, nectary ; 0. style: /i, tube of 

 the corolla.; i, filaments ; li, two divisions of the style ; m, anther cylinder ; 3, 

 disk flower pollen issuing ; 4, older disk flowers ; 5, tip of style of a disk flower, 

 first male stage: r, stlgmatic papillae; 8, sweeping hair; p. pollen grains; 6-8, 

 ChrysanthemumUncavthemum; 6, disk flower (male stage); 8, tip of one stig- 

 matio branch seen from inner side. (After Hermann Mueller). 



with hair and as the style elongates it brushes the pollen out 



