CUAP. III. BOKKERIA. 127 



V5 seed. Some additional berries were produced 

 which contained no seeds. The plants thus treated were 

 therefore excessively sterile, and their slight degree of 

 fertility may be attributed in part to the action of the 

 many individuals of Thrips which haunted the flowers. 

 Mr. J. Scott informs me that a single plant (probably 

 a long-styled one), growing in the Botanic Gardens at 

 Edinburgh, which no doubt was freely visited by in- 

 sects, produced plenty of berries, but how many of 

 them contained seeds was not observed. 



BORRERIA, NOV. SP. NEAR VALERIANOIDES 



Fritz Miiller sent me seeds of this plant, which is 

 extremely abundant in St. Catharina, in South Brazil ; 

 and ten plants were raised, consisting of five long- 

 styled and five short-styled. The pistil of the long- 

 styled flowers projects just beyond the mouth of the 

 corolla, and.- is thrice as long as that of the short- 

 styled, and the divergent stigmas are likewise rather 

 larger. The anthers in the long-styled form stand 

 low down within the corolla, and are quite hidden. 

 In the short-styled flowers the anthers project just 

 above the mouth of the corolla, and the stigma stands 

 low down within the tube. Considering the great 

 difference in the length of the pistils in the two forms, 

 it is remarkable that the pollen-grains differ very little 

 in size, and Fritz Miiller was struck with the same 

 fact. In a dry state the grains from the short-styled 

 flowers could just be perceived to be larger than those 

 from the long-styled, arid when both were swollen by 

 immersion in water, the former were to the latter in 

 diameter in the ratio of 100 to 92. In the long-styled 

 flowers beaded hairs almost fill up the mouth of the 

 corolla and project above it ; they therefore stand 

 above the anthers and beneath the stigma. In the 



