332 Britton: Studies of West Indian plants 



nun. long; flowers few, in small axillary clusters not longer than 

 the leaves, or these terminating short leafy twigs; pedicels short, 

 puberulent; calyx silky-pubescent, its lobes short, broad, obtuse; 

 petals cuneate-spatulate, rounded at the apex, 3-3.5 mm. long; 

 drupe oblong or narrowly oblong-obovoid, obtuse, about 8 mm. 

 long and 4 mm. in diameter. 



Grassy plain, Aripo Savanna, Trinidad {Britton, Hazen and 



Freeman 200$, April 21, 1920). 



Acacia quadricostata sp. nov. 



A woody vine, up to 8 m. long, the old stems 4-ribbed or 4- 

 flanged, about 8 cm. thick near the base, the twigs 4-angled, armed 

 with recurved prickles about 3 mm. long. Leaves 2-pinnate, 6-17 

 cm. long; stipules wanting; petiole slender, bearing a sessile, 

 circular gland; rachis glabrous, sometimes bearing a few minute 

 prickles; rachilla very slender, angular 1 ; leaflets 35 pairs or fewer, 

 sessile, linear-lanceolate, acutish, 6-8 mm. long, about 1 mm. 

 wide, truncately inequilateral at the base, the midvein somewhat 

 eccentric, the lateral veins few, glabrous, except for a characteristic 

 line of yellowish hairs on the underside of the midvein near the 

 base; legume linear-oblong, flat, densely puberulent, 5-9 cm. 

 long, nearly 2 cm. wide, narrowed at the base with a short stipe, 

 acute and short-tipped; seeds orbicular, dark brown, about 7 mm. 

 in diameter. 



Hillside, Chacachacare Island, Trinidad {Britton, Freeman and 

 Watts 2685), in fruit April 3, 1921. The prickles are persistent 

 upon the old stems and branches. 



Erythrina pallida Britton and Rose sp. nov. 



A small tree, 4 meters high; young growth puberulent; second 

 year growth glabrate with shining gray bark; spines at base of 

 leaves stout, reflexed, 6-8 mm. long; leaves large; rachis 2 cm. 

 long or more, glabrous; leaflets 3, broadly ovate, sometimes 

 obliquely so, acuminate, 12-15 cm. long, green above, very pale 

 beneath, glabrous on both sides at least when mature; inflores- 

 cence subsessile, paniculate, 1-2 dm. long; pedicels stout, about 

 1 cm. long; calyx 1.5 cm. long, nearly truncate, except a small 

 protuberance on the lower side; corolla salmon-colored, narrow, 



7 cm. long; fruit with a long slender stipe 3 cm. long; tipped w r ith 

 a rigid persistent style, 2 cm. long, moniliform, 8-io-seeded; seed 



8 mm. long, 6 mm. broad. 



Hillsides and roadsides, Trinidad. Type from roadside near 

 Carenage {Britton 2656), April 4, 1921. Commonly planted as 

 a fence tree in Trinidad. 



