

190 MISSOURI BOTANICAL GARDEN. 



to this type, but it may be treated here, provisionally, at 

 least. 



In the Leguminosae, the apically dehiscent forms of this 

 type are confined, with the single exception of Krameria, 

 to the Cassieae of the Caesalpinioideae. The genera of 

 the Cassieae are distinguished from all others of this sub- 

 family except Krameria by their usually basifixcd, apically 

 dehiscent anthers, those of all other genera being dorsi fixed 

 and versatile and with longitudinal dehiscence. In exam- 



ining the genera of the Cassieae itself I find that the apically 

 dehiscent forms have, as compared with the others, a more 

 elongate anther and a shorter filament. The patent corolla 

 is general in the Caesalpinioideae but the form of the anthers 

 in the apically dehiscent genera will, I think, be found 

 quite different from that of the other genera. 



Tremandraccae. 



The Tremandraceae (represented by 3 genera of about 

 23 species endemic in West and South Australia) constitute 

 the only dicotyledonous family in which all the species are 

 apically dehiscent. The four parallel cells in the same 

 plane in the anthers of Platt/theca, and the terminal tube 

 opening by a single pore in this genus and Tetratheca merit 

 especial mention. The genera of this family, while offer- ' 

 ing some minor points of difference from the others, must 



most 



type . 



Sterculiaceae. 



In the Sterculiaceae, llermannia shows dehiscence by 

 longitudinal slits, but the habit of the androecium is so 

 similar to that of Solarium, Boracjo and some other forms 

 that it may be mentioned for comparison. 



In Thomasia (21 species, all but 1 confined to Australia) 

 much the same condition prevails except that here the 

 ovate or oblong anthers, conniveut in a cone around the 

 ovary, dehisce by short, sometimes almost poriform,introrse 



