﻿Britton: Studies of West Indian plants 387 



mm. long; heads solitary or sometimes 2 together at the ends of 

 twigs; young involucre I cm. long, its floccose bracts in about 5 

 series, acute, the outer ovate, the inner lanceolate. 



Rocky mountain side, Loma Mensura, about 800 m. alt., 

 Oriente, Cuba (Shafer 3811). 



The leaves are similar to those of A. Picardae Urban, of Haiti. 



38. UNDESCRIBED WEST INDIAN SPECIES 

 Cyperus calcicola sp. nov. 



Perennial by short rootstocks; culms slender, tufted, smooth, 

 1-2.5 dm. high. Leaves shorter than the culm, 0.5-1 mm, wide; 

 bracts of the involucre 2 or 3, the longer sometimes 4 cm. long, 

 similar to the leaves; head globose, solitary, 5-7 mm. in diameter; 

 spikelets about 3-flowered, 3-5-4-5 mm. long; scales dark brown, 

 the lowest empty ones persistent on the axis after the fall of the 

 rest of the spikelet, lanceolate, the others ovate to ovate-lanceolate, 

 acute, faintly striate-nerved. 



Limestone rocks, Cayo Muertos, Porto Rico (Britton, Cowell 

 & Brown 4976) . 



Related to C. fuligineus Chapm., in which the scales of the 

 spikelet are more numerous, strongly striate-nerved and mucro- 



Psilocarya portoricensis sp. nov. 



Annual, with fibrous roots; culm rather slender, about 4 dm. 

 high. Leaves shorter than the culm, 2-3 mm. wide; umbels several, 

 slender-stalked; spikelets 3-5 in the umbels, ovoid, acutish, 4-6 

 mm. long, 2 mm. thick; scales ovate, dark brown, sharply acute; 

 style rather deeply 2-cleft; achene oblong, i mm. long, trans- 

 versely wrinkled; tubercle triangular, acute, one third to one half 

 as long as the achene, and distinctly decurrent upon it. 



Shore of Laguna Tortuguero, Porto Rico (Britton, Cowell &f 

 Brown 3830) . 



Nearest to P. nitens (Vahl) A. Wood, of eastern continental 

 North America, the achene of which is smaller, suborbicular and 

 the tubercle scarcely decurrent. 



R3na.chospora borinquensis sp. nov. 

 Perennial by short rootstocks; culms slender, trigonous, about 

 6 dm. high. Leaves flat, about 2 mm. wide, shorter than the culm ; 



