98 SOUTH NIGERIAN PLANTS 
MONOCOTYLEDONS. 
By Dr. A. B. RENDLE, F.R.S. (excepting Zingiberaceae 
by H. N. Ribrey, C.M.G. F.R.S.). 
ORCHIDACEE. 
The collection contains seventy species, of which twenty are 
new. Their affinity is almost exclusively West Tropical African, 
and as might be expected a large proportion occur also in the 
Cameroons, seventeen species being hitherto known only from 
that area. Among these is the genus Auxopus recently described 
by Dr. Schlechter from a single locality. Nineteen species have 
a wider distribution through the region bordering on the Gulf of 
Guinea from Sierra Leone to Gaboon, including Prince's Island 
and the Island of St. Thomas; Habenaria barrina Ridl. has 
hitherto been known only from St. Thomas. A smaller number, 
seven, are more generally West Tropical African, extending 
southwards to the French Congo or Angola. 
Platanthera helleborina Rolfe and Habenaria procera Lindl. 
are interesting additions, being previously recorded only from 
Sierra Leone, the latter known apparently only from Lindley’s 
figure (Bot. Reg. t. 1858), with which the Nigerian specimen 
agrees. Two of the new species belonging respectively to 
Bulbophyllum and Habenaria have also been sent from Liberia 
by Mr. R. H. Bunting. 
It is with much regret that I have felt compelled to quote 
the species of Listrostachys and Mystacidium under Angraecum. 
Dr. Schlechter has recently given repeated instances of cases 
where the affinity deduced from general characters is at variance 
with that deduced from the single character of the pollinia and 
their appendages; species obviously closely allied must be 
artificially separated on this criterion. The multiplicity of names 
borne by many of the species is an indication of the unsatisfactory 
nature of the system which continues to maintain this distinction. 
An example is afforded by the species which I originally described 
as Listrostachys clavata; the pollinia were attached by their 
caudicles to a single gland, which, however, being easily separable 
into two parts, was on this account referred by Mr. Rolfe to 
Mystacidium. More recently Dr. Schlechter, in describing a new 
species, Angraecum affine (in which the two pollen-stalks are 
attached to a common gland), mentions as its nearest ally the - 
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