16 MR. G. D. HAVILAND: REVISION OF THE NAUCLEES. 
The genus Nauclea is very abundant in Malasia, but, unlike 
the genus Uncaria, it is badly represented in Malpina and has 
its chief development further East. It resembles the genus 
Sarcocephalus in that the peduncles are always simple and 
terminal, though often ternate; it resembles Breonza in that the 
peduncles are often flattened; and it resembles Adina in the 
seeds and manner of opening of the fruit: Adina is, however, 
the only genus into which it graduates. The most typical are 
the Malayan species: they have stout style and globose stigma, 
anthers included, corolla-tube stout, calyx-lobes filiform, gene- 
rally with thickened tips, and deciduous. The peduncles are 
sometimes slender and flattened, sometimes terete and thicken 
upwards, they are generally jointed just below the flower-head, 
and the bracts are generally large, though caducous. The 
stipules are flat and entire. Bracteoles are absent or stiff and 
glabrous. Looking to the South-east, two peculiar species are 
found in New Guinea, and one, N. Forsterii, is found in many 
of the South Sea Islands; this species has large villous clavate 
calyx-lobes. Looking to the North, two species with typical 
Malayan characters reach Cochin China; but the species of 
JNauclea which are found in India and two of those which are 
found in the Philippines depart from the typical Malayan form 
and approach Adina. In these Indian species the peduncles 
are jointed in the middle and the bracts are small, and bracteoles 
are always present, though they are stiff and glabrous, and quite 
different from the bracteoles of Adina. Two of these species 
were placed under Adina by Sir Joseph Hooker, and one of 
them was placed under Adina by Vidal; but they must all go 
together, and they go better with Mauclea than with Adina. 
They have the stout style and globose stigma, they have the 
included anthers and the deciduous calyx-lobes, and they have 
the simple terminal peduncles. Nauclea sessilifolia, stretching 
from the north of India to Cochin China, is a very peculiar 
form. Nauclea Griffithii is very close indeed to Nauclea pur- 
purea—the one occupies the North of India, the other the 
Peninsula. Nauclea zeylanica differs from all the other species 
in having only one ovule in each cell and its calyx-lobes seem to 
be persistent ; I have not seen its fruit. Thus the genus Nauclea 
resembles the genus Uncaria in undergoing a great change in 
passing from Malasia to India. There is also a similar change 
m passing to the South-eastern portion of the continent, for 
