MORPHOLOGY OF ANGIOSPERMS. 



143 



Fig. 86. 



Fig. 87. 



Figs. 86 and 87. Manner of cross- pollination in some hermaphrodite flowers. 1,2, 

 Flowers of buckwheat, showing long style and short filaments in i, and short styles and 

 long filaments in 2: a, anthers; st, stigmas; n, nectaries. .3, Spike of plantain showing 

 maturing of stamens below and pistils above. 4, Dissected flower of plantain: b, bract; 

 c, calyx; p, corolla tube; s, stamens; t, protruding withered style, s. Flowers of Purple 

 willow-herb (Lythmm SaUcaria). one side of the perianth removed from each. A is long- 

 staled. B, medium-styled, and C, short-styled. The direction of the arrows and dotted lines 

 indicates the best methods of crossing. i, 2, 5, adapted from Warming. 



