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, whieh 
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 singular 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 pistillum in Potalia, however, if my account of it be correct, 
agrees in division with that of Apocinez : and the deviation from this 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 there are 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, 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. esculentum of India,t was found, apparently indigenous, 
on several parts of its banks. 
The ACANTHACE/ of the collection, consisting of sixteen species, the 
far greater part of which are new, have a much nearer relation to those of 
India than to the American portion of the order. Among these there are 
several species of Nelsonia§ and Hypoestes ;\| a new species of Altheilema,{] 
a genus from which perhaps Phaylopsis of Willdenow is not different, though 
its fruit is described by Wendland** as a legumen, and by Willdenow, with 
almost equal impropriety, as a siliqua;‘a plant belonging to a genus I have 
formerly alluded to as consisting of Ruellia uliginosa and R. balsamea ;++ and 
* Linn. Soc. Transact. 12, p. 89. + Wernerian Nat. Hist. Soc. Trans. 1, p. 40. 
+ Periploca esculenta, Roxb, Coromand. 1, p. 13, t. 11. 
§ Prodr. Flor. Nov. Holl. 1, p. 480. || Op. citat. 1, p. ATA. 
I Prodr. Flor. Nov, Holl. 1, p. 478. “* Micranthus, Wend. Botan. Beobacht. 38. 
t+ Loe. citat. 
