450 APPENDIX. No. V. 



to the quinary division of the floral envelopes and corresponding number of 

 stamina, or to the bilocular or double ovarium : and in Asclepiadew, which 

 are generally referred by authors to the same order, something like a necessary 

 connection may be perceived between these relative numbers of stamina and 

 pistilla, and the singula!' mode of fecundation in this tribe. But in Potalia 

 and Anthocleista there is a remarkable increase in the number of stamina and 

 segments of the corolla, and at the same time a reduction in the divisions of the 

 calyx. The pistiUum in Potalia, however, if my account of it be correct, 

 agrees in division with that of i^pocinese : and the deviation from tliis division 

 in Anthocleista is only apparent ; the ovarium, according to the view I have 

 elsewhere given of this organ,* being composed of two united ovaria, again 

 indeed subdivided by processes of the placenta, but each of the sub-divisions 

 or partial cells containing only one half of an ordinary placenta, and that not 

 originating from its inner angle, as would be the case were the ovarium 

 composed of four confluent organs. 



Of ASCLEPIADE^E there ai-e very few species in the collection, and 

 none of very remarkable structure. The Periploca of equinoctial Africa 

 alluded to in my essay on this family ,-f- was one of the first plants observed 

 by Professor Smith at the mouth of the river ; and a species of Oxystelma, 

 hardly different from O. esculcntum of India, J was found, apparently indigenous, 

 on several parts of its banks. 



The ACANTHACEjE of the collection, consisting of sixteen species, the 

 fai- greater part of which are new, have a much nearer relation to those of 

 India than to the American portion of the order. Among tliese there are 

 several species oi Nelsonia^ and Hypoestes ;\\ a new species of JEtheilema,^ 

 a genus from which perhaps Phaylopsis of Willdenow is not chfferent, though 

 its fruit is described by Wendland** as a legumen, and by Willdenow, with 

 ' almost equal impropriety, as a sUiqua ; a plant belonging to a genus I have 

 formerly alluded to as consisting oiRuellia uliginosa and R. halsamea ,"f~f- and 



* LitiH. Soc. Transact. 12, p. 89. t JVernerian Nat. Hist. Soc. Tram. \,p. 40. 



* Periploca esculeola, Roxb. Coromand. \,p. 13, /. 11. 



^ Prodr. Flor. Nov. Holl. I, p. 480. |1 Op. lilat. \,p. 474. 



1i Prodr. Flor. Nov. Holl. I, p. 478. •» Micranthus, /fVwrf. Bolan. Beobacht. 38. 



++ Loc. dial. 



