1892.] D. Prain — Mezoneuron from the Andaman Group. 131 



Baker describes the calyx of M. glabrum as glabrous, but both by 

 his diagnosis and figure Desfontaine (Mem. Mm. iv, 246, t. 10) indi- 

 cates that the calyx is tomentose ; the writer has not seen an}' flowering 

 specimens. 



Mezoneuron andamanicum Prain, sp. no v. 



A large climber, branches glabrous with a few pale, scattered 

 prickles. Leaf rachis 1— If ft., pinnae 4-10, long-stalked, leaflets 8-10, 

 rigidly subcoriaceous, f-lf in. long, alternate, obovate, slightly retuse, 

 base cuneate, glabrous on both surfaces, dark green above, paler below. 

 Racemes uubranched, 10-12 inches long, pedicels \— § in. long. Calyx 

 leathery, anterior sepal | in. long, deeply cucullate, the others § in. diam., 

 orbicular, all green and delicately reticulately yellow-veined, the inter- 

 spaces dotted with yellow glands. Petals yellow with base and veins 

 reddish, ovate-orbicular, the lateral and anterior pairs subequal and 

 only slightly larger than the lateral and posterior sepals, with very 

 short claws, slightly hirsute internally, the inner and upper (vexillary) 

 petal with a lamina less than ^ the size of the others, with a thick claw 

 as long as the blade, channelled internally and prolonged at the base of 

 the lamina into a ligular ridge, densely ciliate at its margin, which rests 

 in the angle formed by the decimate filaments. Stamens decimate, in 

 two rows, the outer row (5) with lowest stamen single, longer than the 

 rest, curved, the lateral rather shorter, also curved ; the upper pair ab- 

 ruptly angularly bent, with the portion of the filaments below the angle 

 thrice as thick as the other filaments and filling up the channel in the 

 claw of the vexillum, the upper portion not thicker than the other 

 filaments, bent backwards over the vexillary ligule. The inner row (~>) 

 with upper vexillary stamen smallest of all, simply, declinately curved 

 as are the other four ; all filaments densely pilose in the lower 2/3 rds. 

 Ovary declinate, about 6-ovuled ; style long, stigma terminal, concave, 

 tip slightly fringed. Pod thin, 5 inches long, 1 inch wide (including 

 the posterior wing \ in. wide) finely reticulated, 3-5 seeded ; seed flat, 

 orbicular, embryo exalbuminous, with flat cotyledons and straight radicle. 



South Andaman ; near Port Blair at Protheropnr, Rangachang. 

 etc., Prain! King's Collectors! 



Fl. January — February. 



