132 BOTANY OF CONGO. 



ovarium entirely distinct from the calyx ; its capsule in ap- 

 pearance and dehiscence is exactly like that of Bursaria. 



The existence of this genus tends to comfirm what I 

 have formerly asserted respecting the want of satisfactory 

 distinguishing characters between these two orders, and to 

 prove that they belong to one natural class ; the ovarium 

 superum approximating it to Apocinese ; the interpetiolary 

 stipules and structure of seeds connecting it, as it appears 

 to me, still more intimately with Rubiaceas. 



The arguments adduced by M. de Jussieu^ for excluding 

 listeria from Rubiacese and referring it to Apocinese, are, 

 its having ovarium superum, an irregular corolla, fleshy 

 albumen, and only one stamen ; there being no example 

 of any rediiction in the number of stamina in Rubiaceaj, 

 (in which Opercularia and Pomax are not included by M. 

 de Jussieu) while one occurs in the male flowers of Ophi- 

 oxylum, a genus belonging to Apocinese. From analogous 

 reasoning he at the same time decides in referring Gart- 

 nera of Lamarck" to Rubiacese, though he admits it to 

 have ovarium superum ; its floAvers being regidar, its albu- 

 men more copious and horny, and its embryo erect. But 

 all these characters exist in the new genus from Congo. 

 These two genera therefore, together with Pagamea of 

 Aublet, listeria, Geniostoma of Porster (which is Anasser 

 of Jussieu) and Loz/ania^ might, from their mere agree- 

 ment in the situation of ovarium, form a tribe inter- 

 M9] mediate between Rubiacese and Apocinese. This tribe, 

 however, would not be strictly natural, and from analogy 

 with the primary divisions admitted in Rubiacese, as well 

 as from habit, would require subdivision into at least four 

 sections : but hence it may be concluded that the only 

 combining character of these sections, namely, ovarium 

 superum, is here of not more than generic value ; and it 

 must be admitted also that the existence or absence of 

 stipules is in Logania* of still less importance. 



1 Annal da Mus. d'Hist. Nat. \Q,p. 323. » m^str. Gen. tab. 167. 



3 Prodr. Flor. Nov. Holl. 1, p. 455. •' Prodr. Flor. Nov. HoU. 1, p. 455. 



