Britton: Studies of West Indian Plants 7 



13. Pithecolobium trinitense sp. nov. 



A tree up to 10 m. high; young twigs, petioles and rachises 

 densely brown-puberulent. Leaves 10-15 cm - long; glands cir- 

 cular, I mm. in diameter; petioles 1.5 cm. long or less; pinnae 

 6-8 pairs, approximate; leaflets 12-16 pairs on each pinna, oblong, 

 chartaceous, slightly inequilateral, 5-7 mm. long, 3 mm. wide or 

 less, rounded at the apex, obliquely obtuse at the base, glabrous 

 or nearly so and dark green above, pale, and pubescent beneath, 

 at least on the veins, the midvein prominent; peduncles densely 

 puberulent when young, glabrous when old; young flower-heads 

 densely puberulent; flowers unknown, apparently capitate; pod 

 curved into a nearly complete circle, about 6 cm. long and 7 mm. 

 wide, somewhat constricted between the seeds; seeds blue, shining, 

 orbicular-obovoid, somewhat compressed, 5 mm. long. 



Hillside, El Porvenir to Aguacate, Trinidad Mountains, Santa 

 Clara, at 700-900 m. altitude, March 10, 1910 (Britton fir Wilson 

 5346, type). 



14. Pithecolobium (?) guantanamense sp. nov. 



A tree, 10 m. high with flexuous twigs, the foliage sparingly 

 villous-pubescent. Leaves 6-8 cm. long, petioles slender, 1 cm. 

 long or less; glands scutellate, 0.5 mm. in diameter; pinnae 2 

 pairs; leaflets 20 pairs or fewer, linear, chartaceous, 5-7 mm. long, 

 1-1.5 mm. wide, inequilateral, pale green but somewhat darker 

 above than beneath, acute at the apex, obliquely obtuse at the 

 base, the few veins prominent beneath; flowers unknown; pod 

 compressed, glabrous, chartaceous, dehiscent, doubly coiled, 6-8 

 cm. long, 7-8 mm. broad over the seeds, constricted between them, 

 the coils about 2 cm. broad; immature seeds suborbicular, some- 

 what flattened, 4 mm. in greatest diameter. 



Bank of a water course, United States Naval Station, Guanta- 

 namo Bay, Oriente, March, 1909 (Britton 2051). 



15. Pithecolobium arboreum (L.) Urban, Symb. Ant. 2: 259. 



1900 



Mimosa arbor ca L. Sp. PI. 519. 1753- 



Pithecolobium filicifolium Benth. in Hook. Lond. Journ. Bot. 3: 



205. 1844. 

 ? Mimosa filicifolia Lam. Encycl. I: 13. 1783- 



Hillsides, river-banks and woodlands at lower and middle 

 elevations, ascending, in Oriente, to at least 330 m.; all provinces 



