134 HETEEOSTYLED DIMORPHIC PLANTS. Chap. III. 



I 



me that lie 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 [iSP. ?] (BnBIAOB.«l). 



Dried flowers of this plant, which grows in small wet ditches 

 in St. Catharina, in Brazil, were likewise sent me by Frite 

 MUller. 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 corre- 

 spondence in height between the stigmas 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 are 

 as 100 to 80 in diameter, compared with those from the long- 

 styled form. 



Cinchona micrantha (Eubiaoe.^!). 



Dried specimens of both forms of this plant were sent me from 

 Kew.* In the long-styled form the apex of the stigma stands 

 just beneath the bases of the hairy lobes of the corolla ; whilst 

 the summits of the anthers are seated about halfway down 

 the tube. The pistil is in length as 100 to 38 to that of the 

 short-styled form. In the latter the anthers occupy the same 

 position as the stigma of the other form, and they are con- 

 siderably longer than those of the long-styled form. As the 

 simunit of the stigma in the short- styled form stands beneath 

 the bases of the anthers, which are seated halfway down the 

 corolla, the style has been extremely shortened in this form; 

 its length to that of the long-styled being, in the specimens 

 examined, only as 5 "3 to 100 ! The stigma, also, in the short- 

 styled form is very much shorter than that in the long-styled, 

 in the ratio of 57 to 100. The pollen-grains from the short- 



* My attention was called to 3, given by Mr. Markham in his 

 this plant by a drawing copied 'Travels in Ppru,' p. 539. 

 from Howard's ' Quinologia,' Tab. 



