APPENDIX. No. V. 439 
nearly related to them as Erythrospermum, well described and figured by the 
same excellent botanist.* 
The increased number of stamina in Homalium, and particularly in the 
genus from Congo, instead of presenting an objection to this affinity, appears 
to me to confirm it. It may be observed also that there are two genera 
referable to Passifloreee, though they will form a separate section of the 
order, which have a much greater, and even an indefinite, number of perfect 
stamina, namely, Smeathmania, an unpublished genus of equinoctial Africa, 
agreeing in habit, in perianthium, and in fruit, with Paropsia; and Ryania 
of Vahl,+ which appears to me to belong to the same family. 
In Passifloreze the stamina, when their number is definite, which is the case in 
all the genera hitherto considered as belonging to them, are opposite to the outer 
series of the perianthium; a character, which, though of general importance, 
aad here of practical utility in distinguishing them from Homaline, is not 
expressed in any of the numerous figures or descriptions that have been pub- 
lished of the plants of this order. 
Passiflorese and Cucurbitaceze, though now admitted as distinct families, are 
still placed together by M. de Jussieu; and he considers the floral envelope 
in both orders as a perianthium or calyx, whose segments are disposed in a 
double series.t 
These views of affinity and structure are in some degree confirmed by 
Homalinz, in which both ovarium inferum and superum occur; and in one 
genus of which, namely, Blackwellia, the segments of the perianthium, though 
the complete number, in relation to the other genera of the order, be present, 
are all of similar texture and form, and are disposed nearly in a simple series. 
If the approximation of these three families be admitted, they may be consi- 
dered as forming a class intermediate between Polypetale and Apetalz, whose 
principal characters would consist in the segments of the calyx being disposed 
in a double series, and in the absence of petals: the different orders nearly 
agreeing with each other in the structure of their seeds, and to a considerable 
degree in that of the ovarium. 
The formation of this class, however, connected on the one hand with 
* Op. cttal. 65. + Hélog. 1, p. 51, t. 9. 
+ Annal. du Mus, d’ Hist. Nat. 6, p. 102. 
