316 PROCEEDINGS OF THE AMERICAN ACADEMY 



of the types of Dimetia, and in H. recurva, Benth. (allied to H. ma- 

 crostema, Hook. & Arn., the type of the section 3Iacrandria, which I 

 have not seen), the free summit is very soon septicidal also. These 

 species, which may be taken to represent Wight and Arnott's Dimetia 

 and Macrandria, accord far better in aspect and character with Hous- 

 tonia (section Anotis) than with true Hedyotis, and would perhaps 

 form a subgenus of the former, if not to be distinguished from both. 



On the other hand, all Wight and Arnott's species of their subgenus 

 Diploph'agma, having wholly inferior and purely septicidal-dicoccous 

 fruit, adhere more naturally to Hedyotis. Their third division of this 

 group appears strictly referable to that genus. Their remaining species 

 may compose a subgenus of the same ; but the dehiscence and the 

 calyx, produced beyond the ovary into a merely 4-toothed or 4-cleft 

 cup or limb, decidedly separate them from Houstonia. In the latter, 

 the calyx is adnate up to the origin of the lobes. So it is in 



Kadua, Cham. & Schlecht., a genus of more or less shrubby plants, 

 natives of the Sandwich Islands, which was also reduced to the com- 

 pound genus Hedyotis by Endlicher. Through the smaller and sub- 

 herbaceous species, it does indeed nearly approach Kohautia. From 

 this and from all the other related genera, Kadiia may be technically 

 distinguished by the somewhat salient or reduplicate edges of the lobes 

 of the corolla in aestivation, and by the inflexion of their tips in all but 

 two of the species, which again are well characterized by their winged 

 seeds. The seeds, moreover, are compressed in Kadua, (not depressed 

 or obcompressed,) packed side by side, and attached by one edge, not 

 by one face. The capsule, also, is hard and firm, and tardily dehis- 

 cent, except by the transverse chink at its naked summit, in some 

 species perhaps slightly drupaceous before maturity; which led the 

 founders of the genus wrongly to refer hither two baccate species, then 

 imperfectly known, — as has already been mentioned. 



Meyen's genus Weigmannia is only Kadua cordata ; and what is de- 

 scribed and figured in the Reliquice Meyenianse as a single large seed 

 in each cell evidently consists of a mass of seeds closely packed upon 

 the placenta. 



The two wing-seeded species would fall into the subtribe Cinchonece, 

 according to the prevalent arrangement, which also too widely sepa- 

 rates Bouvardia from Houstonia, &c. ; but there are other cases known 

 in the family of winged and wingless seeds occurring in the same 



