134 HETEROSTYLED DIMORPHIC PLANTS. CHAP. III. 



styled form ; but in the latter the stigmas stand rather be- 

 neath the level of the anthers in the other or long-styled 

 form, these being enclosed within the tube of the corolla. 

 The pistil of the long-styled form is nearly thrice as long 

 as that of the short-styled, or, speaking strictly, as" 100 to 

 39 ; and the papillae on the stigma of the former are broader, 

 in the ratio of 4 to 3, but whether longer than those of 

 the short-styled, I could not decide. In the short-styled 

 form the anthers are rather larger, and the pollen-grains 

 are to those from the long-styled flowers as 100 to 88 in 

 diameter. Fritz Miiller sent me a second, small-sized spe- 

 cies, which is likewise heterostyled. 



COCCOCYPSELUM [SP.?] (KUBIACE.E). 



Fritz Miiller also sent me dried flowers of this plant 

 from St. Catharina, in Brazil. The exserted stigma of the 

 long-styled form stands a little above the level of the ex- 

 serted anthers of the short-styled form; and the enclosed 

 stigma of the latter also stand a little above the level of the 

 enclosed anthers in the long-styled form. The pistil of the 

 long-styled is about twice as long as that of the short- 

 styled, with its two stigmas considerably longer, more di- 

 vergent, and more curled. Fritz Miiller informs me that 

 he could detect no difference in the size of the pollen- 

 grains in the two forms. Nevertheless, there can be no 

 doubt that this plant is heterostyled. 



LIPOSTOMA [SP.?] (BUBIACE.E). 



Dried flowers of this plant, which grows in small wet 

 ditches in St. Catharina, in Brazil, were likewise sent me 

 by Fritz Miiller. In the long-styled form the exserted 

 stigma stands rather above the level of the exserted anthers 

 of the other form ; whilst in the short-styled form it stands 

 on a level with the anthers of the other form. So that the 

 want of strict correspondence in height between the stig- 

 mas and anthers in the two forms is reversed, compared 

 with what occurs in Hedyotis. The long-styled pistil is to 

 that of the short-styled as 100 to 36 in length; and its 

 divergent stigmas are longer by fully one-third of their 

 own length than those of the short-styled form. In the 

 latter the anthers are a little larger, and the pollen-grains 



