122 HETEROSTYLED DIMORPHIC PLANTS. Chap. III. 



stigmas stand beneath the anthers. The stigmas in many, 

 but not in all the short-styled flowers, are larger than those 

 in the long-styled. The anthers of the short-styled flowers 

 stand on a level with the stigmas of the other form; but 

 the stamens are longer by only one-fourth or one-Afth of 



Fig. 8. 



Long-styled form. 



Short- styled form. 



From a sketch by Fritz Muller, magnified five times. 



Eeythroxylon [sp. ?]. 



their own length than those of the long-styled. Conse- 

 quently the anthers of the latter do not stand on a level 

 with, but rather above the stigmas of the other form. Dif- 

 ferently from what occurs in the following closely allied 

 genus, Sethia, the stamens are of nearly equal length in 

 the flowers of the same form. The pollen-grains of the 

 short-styled flowers, measured in their dry state, are a little 

 larger than those from the long-styled flowers in about the 

 ratio of 100 to 93* 



* F. Muller remarks in his let- 

 ter to me that the flowers, of which 

 he carefully examined many spe- 

 cimens, are curiously variable 

 in the number of their parts : 5 

 sepals and petals, 10 stamens and 3 



pistils are the prevailing numbers ; 

 but the sepals and petals often 

 vary from 5 to 7 ; the stamens from 

 10 to 14, and the pistils from 

 3 to 4. 





