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BRITTON: STUDIES OF WEsT INDIAN PLANTS 3 
2. Leaflets linear to oblong, small, 5-16 mm. long, 
6-many pairs to each pinnule 
Leaflets 2-3 mm. long, oblong, coriaceous. 11. P. nipense. 
Leaflets 5-16 mm. long, thin, dull. 
Leaflets ea oblong, narrowed at base. 12. P. asplenifolium. 
Leaflets linear, linear-lanceolate or oblong, 
obtuse, rounded or subcordate at the base. 
ras aie 5-7 mm. long. 13. P. trinitense. 
eafiets linea 
so 2 pairs; leaflets acute, strongly 
veined; pod compressed. 14. P. guantanamense. 
Pinnae 3-11 pairs; leaflets obtuse, not 
strongly veined; pod swollen. 15. P. arboreum. 
B. Pods straight, or curved, indehiscent, or dehiscent, the valves not twisting. 
Unarmed trees. 
Pod straight or a little curved, compressed, turgid, 
eshy; leaflets oblong to obovate, large. 16. P. Saman. 
Pod straight, thin, very flat, chartaceous; leaflets 
linear, small, very numerous. 17. P. Berterianum. 
Trees or shrubs, armed with spinescent stipules (P. tortum 
imes unarmed). 
Pod coriaceous, tardily dehiscent; stamens 2 cm. lon, 
or less, the tube short; leaflets many; spines straight. 18. P. tortum. 
eous, thin and flat, dehiscent;.stamens 5-6 
cm. long, the tube much exserted; leaflets few; 
spines curved. 19. P. prehensile. 
1. PITHECOLOBIUM CIRCINALE (L.) Benth. Lond. Journ. Bot.. 
3: 201. 1844 
Mimosa circinalis L. Sp. Pl. 517. 1753. 
Thickets in dry districts at low elevations, southern Oriente; 
Hispaniola. 
Bentham’s record of this species for the Bahamas appears 
to refer to P. mucronatum Britton, which has quite different 
leaves. The Oriente plant differs from the typical one of His- 
paniola in having smaller, thicker leaflets, less cuneate at the 
base, and is either glabrous or densely pubescent. 
2. PirHEcOLOBIUM UNGutIs-caTI (L.) Mart. Hort. Monac. 188. 
1829 
Mimosa Unguis-cati L. Sp. Pl. 517. 1753. 
Cayo Sabinal, Camagiiey (Shafer 1063); recorded by Richard 
as in various parts of the island, but is apparently rare. West 
Indies (except Bermuda); northern South America. 
