244 
Examples of intercontinental distribution or affinity are not 
numerous, but they are of considerable interest. The only 
large natural genus common to the tropics of both hemispheres 
is Xylopia (see map), which is remarkable in the family in having 
transversely septate anthers. The small Brazilian genera Cardio- 
petalum and Hornschuchia also show this character. A new 
species of Xylopia recently discovered in the Cameroons (X. hypo- 
mpra) described by Dr. Mildbraed shows close affinity with 
certain Brazilian species. But the most remarkable instance of 
disconnected distribution in the case of a very natural and out- 
standing genus is Anaxagorea, which is common to Central and 
North Western South America and Indo-Malaya (see map). 
Besides the genus Xylopia there are two other notable examples 
of affinity between Africa and Indo-Malaya, namely, the relatively 
primitive and extensive genus Uvaria (see map) and the genus 
Artabotrys with its peculiar hooked inflorescences. Two other 
genera, Popowia and Polyalthia, are also common to these two 
regions, but with less significance from a geographical point 
of view, for neither could be described as a natural genus, as it 
has evidently been a receptacle for species not easily otherwise 
classified. In the Indo-Malayan region, Sageraea conforms 
exactly with Wallace’s western area, whilst Phaeanthus is common 
to both parts. 
KEY TO THE GROUPS OF ANONACHAS. 
Subfamily I. ANONOIDEAE. Car- 
pels free or if united forming a 
many-celled syncarp ; stigmas erect. 
Petals always in two series, 
both or only the inner series 
imbricate; indumentum of the 
leaves usually stellate or lepidote Tribe J. Uvartnaz. | 
Petals all valvate, either in two 
distinct series or rarely in one 
series, usually 6, rarely 4, more 
rarely 3, in the latter case either 
the inner or the outer series 
missing :— 
Outer three petals smaller than 
the inner ones and often scarcely 
distinguishable from the sepals Tribe IT. MriiusEar. 
Outer petals as large or larger 
than the inner and distinct from 
the sepals or sometimes by re- 
duction onl one series ~ 3 
present - - Tribe IIT. Unonzgas. 
