Britton: Studies of West Indian plants— XI 55 



Forests in wet or moist districts, Trinidad ; type from Arima 

 (Britton 2084). In flower March 4, 1921. 



66. UNDESCRIBED SPECIES FROM PORTO RICO 

 Scleria doradoensis Britton, sp. nov. 



Perennial? Culms slender, rather stiff, glabrous, erect, tufted, 

 3-4 dm. high. Leaves glabrous, scabrate, shorter than the culm, 

 about 2 mm. wide, the apex attenuate; inflorescence terminal, 

 glomerate-spicate, 5-7 cm. long; glomerules 6-8, few-flowered, 

 not nodding; bracts about 3 mm. long, brown-ciliate; achene 

 white, subglobose-obovoid, very obtusely trigonous, verrucose- 

 tuberculate, 1.5 mm. long, 12-porose underneath just above the 

 trigonous base; hypogynium none. 



White sand near Dorado [Britton, Britton and Brown 7064). 



Scleria Stevensiana Britton, sp. nov. 



Perennial? rootstocks short or none; culms very slender, 

 tufted, slightly scabrous above, weak, 4-5 dm. long. Leaves 

 soft, scabrous-margined, 4 mm. wide or less, panicles 2 or 3, 

 axillary, the lower stalked, the upper one nearly sessile, about 

 3 cm. long; bracts narrowly linear-subulate, 2.5 cm. long or less; 

 spikelets several or numerous; achene depressed-globose, about 

 1.5 mm. in diameter, apiculate, glabrous, shining, faintly re- 

 ticulated, nearly white, with 3 vertical brown bands; hypogynium 

 lobes lanceolate, acuminate, glabrous. 



Lares {Stevens and Hess 4944). 



Lagenocarpus portoricensis Britton, sp. nov. 



Culm stout, erect, trigonous, glabrous, about 8 dm. high. 

 Leaves 8-12 mm. wide, nearly as long as the culm, smooth, 

 long-attenuate, with numerous transverse veinlets; panicle 

 narrow, puberulent, about 3 dm. long and 5 cm. thick, the lower 

 half of staminate spikelets on nearly erect branches, the upper 

 half of pistillate; bractlets aristate; staminate spikelets about 4 

 mm. long, short-stalked; scales subtending the achene obovate, 

 subtruncate, ciliolate, mucronate; achene, with its beak, ovoid, 

 3 mm. long, brown with three darker blotches, the beak about 

 as long as the body. 



Wet sandy situations between Manati and Vega Baja (Under- 

 wood and Griggs 946, type) ; collected also by Sintenis near 

 Dorado. Recorded by C. B. Clarke and by Urban as L. tremulus 

 Nees. 



