THE DEHISCENCE OF ANTHERS BY AriCAL PORES. 211 



generally more or less campanulate, perianth of other repre- 

 sentatives of the family. The stamens in this family are 

 usually linear and basifixed on filaments of varying but 

 usually considerable length and, in this respect, conform to 



the ideal type of this class. 



Elongate, basifixed, usually apically dehiscent anthers 



Ochnaceae. Oth 



S 



of the representatives of this family have been assigned. 

 Of the Theaceae my knowledge is insufficient to permit 



of comparisons. 



Bixa of the Bixaceae is an anomalous form. 



Solanum-Cassia Type. 

 Turning now to the Solanum-Cassia type we find mate- 



mor 



The Mayacaceae is monotypic and its relationship is not 

 so evident as to justify comparisons of its floral structure 

 with that of other families. 



All of the genera of the Kapateaceae are apically dehis- 

 cent. The family is considered most closely related to the 

 Xyridaceae and Eriocaulaceae. 



A patent perianth is characteristic of the Commelinaceae 

 and, except for a slight elongation of the anthers, the 

 apically dehiscent genera do not differ essentially from 

 siome others to be found in the family. At the same time 

 the various structure of the anthers and the filaments of 

 many of the genera distinguish them at once from the 

 apically dehiscent forms. 



In the Pontederiaceae, Monochoria 9 the anthers of which 



open only at first by apical pores which are soon continued 

 down the sides in slits, has the corolla tube most reduced 

 and the limb more widely patent than any forms except 



Heter 



The fila- 







ments and anthers are of about equal length, but the 



