90 
Endlieher placed it next to Orophea from which it is distinguished by its 
inner row of petals being free and having their apices indexed in eesti- 
vation, while those of Orophea are clawed, vaulted, attached by their edges, 
mnl nol inilexed in estivation. In their Flora Indica, Hooker films and 
Thomson addod the species P. ramosissivta to the original plant of 
Endlieher, with a remark to the effect that Uvaria Vogelii H. f. 
slmuM lie included in the genus. Farther they associated Popowia with the 
genera Orophea, Mitrephora and Goniothalanins in the tribe Mitrephorem, 
In their Genera f J I ant-arum, Mr. lientham and Sir Joseph Hooker take a 
different view of tho position of Popowia and, in the arrangement adopt- 
ed in that great work, Popowia is put amongst the Unoneae Orophea 
is relegated to the tribe Miliuseae ; while Ooniotfialamtis and Mitrephora 
are retained side by side in the tribe Mitrephoreae. Now the character 
of the tribe Unoneae is: — "petals flat, slightly unequal, or those of the 
inner row smaller than those of the outer, or absent/' while in several of 
the Popowias, e. g. t P. pi$ocarpa r P. ramosissima the inner petals are longer 
than the outer. Baillon, whose arrangement of tribes differs from that 
of Messrs, Bentham and Hooker, puts Popowia into Unoneae y leaving 
Mitrephora and Orophea aide by side in his tribe 0xymitrea3. 
Dr. Scheffer differs from the opinion of the authors of the Genera 
Plantarum and of Raillon and rather inclines to that of the authors of 
tho Flora Indica, He points out with much force that the proper place 
for Popowia is in the tribe characterised by its " outer petals being 
open, the inner connivent over the audro-gyncecium, erecto-connivent or 
connate" — that is to say in the tribe Mitrephorece of these authors. The 
stamens of Popowia present considerable diversity, but on the whole 
they have the character of those of Uvarine rather than those of Unoneae. 
As Scheffer remarks, there is little difference between the genera 
Orophea and Mitrephora except that the outer petals of Mitrephora are 
usually larger than those of Orophea. And if M. Baillon's plan of re- 
ducing the number of the genera in Anouaceae were to be carried out, 
Dr. Scheffer would suggest the union of these two and of Popowia into 
a single genus, from which would be excluded, however, all the African 
species. Of this new genus Orophea would be the typical form, aud the 
other two would form sub-genera. 
Thero is no doubt than in externals many Popowias are like Oro- 
pheas, and the non-unguiculate character of the inner petals of Popowia 
is really the chief character which separates them. 
I venture to follow Dr. Scheffer and the authors of the Flora Indica 
in putting Popowia, Oropliea and Mitrephora together in the tribe Mi- 
trephoreae. 
339 
