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 obliquely oblong, narrowed at base. 12. P. asplenifoliutn. 

 Leaflets linear, linear-lanceolate or oblong, 

 obtuse, rounded or subcordate at the base. 

 Leaflets oblong, 5-7 mm. long. 13. P. trinitense. 



Leaflets linear. 



Pinnae 2 pairs; leaflets acute, strongly 



veined; pod compressed. 14. P. guantanamense. 



Pinnae 3-1 1 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, 



fleshy; leaflets oblong to obovate, large. 16. P. Saman. 



Pod straight, thin, very flat, chartaceous; leaflets 



linear, small, very numerous. 17. P. Berlerianum. 



Trees or shrubs, armed with spinescent stipules (P. tortum 

 sometimes unarmed). 

 Pod coriaceous, tardily dehiscent; stamens 2 cm. long 



or less, the tube short; leaflets many; spines straight. 18. P. tortum. 

 Pod chartaceous, 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. PI. 517. 1753. 



Thickets in dry districts at low elevations, southern Oriented 

 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. Pithecolobium Unguis-cati (L.) Mart. Hort. Monac. 188. 



1829 

 Mimosa Unguis-cati L. Sp. PI. 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. 



