Z BRITTON: STUDIES OF WEsT INDIAN PLANTS 
long, maturing 2 achenes; lower empty scales broadly ovate, the 
others lanceolate,. acuminate; bristles none; achenes obovate- 
orbicular, I mm. long, pale brown, shining, finely cancellate; 
tubercle triangular-lanceolate, acuminate, flat, about one-third 
longer than the achene, its base nearly truncate. 
Rocky banks in the Blue Mountains of Jamaica; type, from 
Hardware Gap, NV. L. Britton 3322, collected Sept. 9, 1908. Re- 
lated to R. elongata (Boeckl.) Clarke, and to R. polyphylla Vahl, 
but at once distinguished from them by its pubescent sheaths. 
24. THE GENUS PITHECOLOBIUM IN CUBA 
A. Pods curved or coiled, dehiscent, the valves twisting after separating. 
1. Seeds with a fleshy aril; stipules spinescent; pinnae I 
or 2 pairs; leaflets 2-4 pairs 
Leaflets 1-6 cm. long (species perhaps confluent). 
Leaflets aciuariiaad 1. P. circinale. 
Leaflets chartaceous; petioles of the lower 
leaves, at least, longer than the petiolules. 2. P. Unguis-catt. 
Leafiets coriaceous; petioles shorter than the 
petiolules or as long. 
Petioles and petiolules stout; leaflets large, 
2.5-6 cm. long. 3. P. guadalupense. 
der; leaflets small 
I-3 cm. long. 
Leaflets only 3-7 mm. long. 
Seeds without a fleshy aril; stipules not spinescent; 
pinnae 2 pairs or more; leaflets 3 pairs or more. 
1. Leafiets obovate to oval, large, 1.5-6 cm. long, 3-6 
pairs to each pinna 
Calyx subtruncate nt base; seeds oblong, about 
twice as long 
Calyx carcowed at base; seeds suborbicular to 
obov 
Mis’ 3 or 4 pairs; sminiee 4-6 pairs; calyx 
- 
P. bahamense. 
. P. Hystrix 
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an 
. P. savannarum. 
. P. discolor. 
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broadly campanulate, coriaceous. 
Calyx truncate, its teeth minute, mucronu- 
late 8. P. truncatum. 
Cais teeth large, broadly ova 
Calyx rt-campanulate; casich’ date 
short; leaflets broadly obovate. 9. P. obovale. 
Calyx long-campanulate; stamen-tube 
mm. long; leaflets oblong to obo- 
vate. to. P. pinetorum. 
