126 MR. S. T. DUNN: A REVISION 
De Candolle under the name of Pongamia sericea, Bentham gave a full 
description and in a long note reviewed the whole group of genera which 
were liable to be confused with these two. One of these, Otosema, has now 
been reduced to Millettia, and with it a new species, O. caudata, deseribed 
on this occasion. Under Millettia 17 species were enumerated, including, 
besides those already mentioned, 2 new ones and 2 reductions. Twelve of 
these 17 are still retained. 
During the seventies Baker wrote his descriptions of all the Millettias then 
known from Tropical Africa and India in the two great Floras of these 
regions in preparation at Kew at that time. To the two already described 
from Tropical Africa were added five from Welwitsch’s Angolan sets and 
four more from other sources. For India 24 were enumerated, including 
seven recently described from Burmese material by Kurz. With these 34 
and the 4 already described from China the strength of the genus was 
thus raised to 38, 33 of which are still retained. The Chinese species 
amounted to six by the time Hemsley published the Leguminose of his 
* Enumeration’ in 1884. Since that time the botanical exploration of Tropical 
Africa, pushed rapidly forward by British, French, German, and Belgian 
collectors (but made effective by publication of the results chiefly by the 
two latter), has brought to light a large number of new species, of which 
Harms has published fourteen, mostly from the German colonies, and 
De Wildeman twelve from the Congo region, while 25 * are added in this 
paper, three being reduced from other genera. The number of African 
Millettias thus stands now at 71. 
The most important recent contribution to our knowledge of the genus in 
Asia has been Prain’s review of the Indian species in the 15th part of his 
* Novitie Indice " +, where eight species are described. Collett and 
Hemsley described three from the collections of the former in the Shan Hills. 
Seven more are described for the first time in this paper, making the Indian 
Millettia list after some necessary reductions up to 34. Chinese Millettias 
with the addition of five in this paper amount to 14. 
With 9 species from the Philippine Islands and a few from other 
countries not mentioned above the total number of the genus as now known 
amounts to 138. 
Such is the history of the genus as it now stands. It is only necessary 
further to explain the absence of a number of species previously included, 
but recognised as aberrant from the average types of Millettia. Soon after 
the commencement of this revision it was realized that the genus as it then 
stood had become so heterogeneous and ill-defined that it would be necessary 
to reduce groups of species to other genera and even in some cases to make 
* For a preliminary account of these, see Dunn in Journ. Bot. xlix. (1911) 221. 
T Prain in Journ. As. Soc. Beng. lxvi. 11. (1897) 358-365. 
