[32 THE ORCHID REVIEW. [May, 1910. 
from the rhizome direct. The inflorescence is axillary, and the flowers are 
borne in spikes, racemes, or umbels, and are very various in structure and 
colour. The mobile lip is articulated to the foot of the column, and is so 
delicately balanced that insects alighting on it are precipitated against the 
column, and thusserve to remove the pollinia, which in turn are left on the 
stigma of the next flower visited. The lip is usually fleshy, but in some 
cases it is hairy, as inthe well-known B. barbigerum and a few others. The 
genus is diffused through the tropics, ranging from North India and Japan 
through the Malayan Archipelago to Australia and New Zealand, while a 
considerable number of species occur in Africa, the Mascarene Islands and 
Tropical America. Upwards of 300 species are known, and several very 
striking ones are in cultivation. 
Cirrhopetalum is sometimes united with Bulbophyllum, because of the 
difficulty of distinguishing the two by absolute characters. In the majority 
of the species the flowers are borne in a whorl, and the lateral sepals are 
much elongated and often united together. The genus extends from North 
India to Polynesia and Madagascar, and over fifty species are known, several 
of which are important garden plants. 
Megaclinium is an exclusively African genus of over thirty species, 
which is sometimes united with Bulbophyllum on account of the general 
similarity of the flowers. Its remarkable feature is the dilated and usually 
flattened rachis, the flowers being borne in a row on either side. The rachis 
varies considerably in shape in the different species, in some being small and 
fleshy, in others much dilated and thin or somewhat fleshy. 
Ione has precisely the habit of Bulbophyllum, but differs in having a 
fixed lip, and the pollinia attached to a gland, which character led Sir 
George King to remove it, with one or two others, to Vandez. The genus is. 
Indian, and contains about ten species. 
Monomeria and Drymoda are remarkable Indian genera which are 
seldom seen in cultivation. The foot of the column is enormously elongated, 
and the lateral sepals are inserted on the foot at a considerable distance 
from the dorsal sepal. In Monomeria the petals are also inserted on the 
foot of the column, and reduced to a few dwarf teeth. The flowers are 
borne in racemes. Drymoda picta has a very similar structure, but has 
single-flowered scapes, in fact the plant has almost exactly the habit of 
Eria extinctoria. It is figured at t. 5904 of the Botanical Magazine. The 
genera Collabium and Chrysoglossum, referred here by Bentham, have 
radical leaves and inflorescenca, and probably belong elsewhere. 
The large American subtribes Pieurothallee and Epidendree must be 
left for a future paper. 
R. A. RoLFe. 
(To be continued.) 
