462 Britton: Studies of West Indian plants 



51. UNDESCRIBED SPECIES FROM THE ISLE OF PINES, 



CUBA 



Zamia silicea sp. nov. 



Caudex slender, completely buried in sand, 2 dm. long or 

 longer. Basal scales lanceolate, villous, 1-2 cm. long; leaves 

 glabrous or the base of the petiole villous, spreading or ascending, 

 1-4 dm. long; leaflets 30 or fewer, coriaceous, shining, many- 

 veined, obovate-oblanceolate, 3-6 cm. long, 2 cm. wide or less, 

 rounded or obliquely subtruncate and callously denticulate at the 

 apex, narrowed at the base; peduncles densely short-pubescent, 

 2-4 cm. long; male cone cylindric, about 3 cm. long and 1.3 cm. 

 thick, its scales densely pubescent, hexagonal, the upper and lower 

 ones about as wide as high, the middle ones nearly twice as wide 

 as high; ripe pistillate cones ellipsoid, short-tipped, 5-6 cm. long, 

 about 2.5 cm. thick, the hexagonal scales puberulent, seeds red, 

 about 12 mm. long, broadly grooved on the inner side, rounded 

 on the back, obliquely and obtusely umbonate at the apex. 



Frequent in pine-lands and in white silicious sand. Type from 

 near Los Indios (Britton & Wilson 14166). 



Cyperus pinetorum sp. nov. 



Perennial by short rootstocks; culms tufted, stiff and wiry, 

 compressed, 1.5-2.5 cm. high. Basal sheaths striate-veined, 

 acute, 2-4 cm. long; involucral leaves 1 or 2, nearly subulate, 0.5-3 

 cm. long; spikelets linear, 10-22 mm. long, 1.5 mm. wide, digitate, 

 one cluster subtended by the involucral leaves with usually a 

 similar one on a slender ray 4 cm. long or less ; scales elliptic, obtuse, 

 mucronulate, yellowish-brown, 1.5 mm. long; achene sharply 

 trigonous, about 0.6 mm. long, nearly as thick as long, often per- 

 sistent on the rachis after the scales have fallen away. 



White sand pine barrens. Type from the vicinity of Los 

 Indios [Britton and Wilson 14170). 



Related to C. Has pan L., differing in broader spikelets, broader 

 scales and proliferous inflorescence. 



Xyris longibracteata Britton & Wilson, sp. nov. 



Annual (?); leaves erect, linear, 8-10 cm. long, 1-1.5 mm. broad, 

 occasionally somewhat spirally twisted, the margin rough; scapes 

 several, erect, glabrous, 15-18 cm. tall, terete or nearly so; in- 

 volucre subtending the spike composed of several bracts of unequal 

 length, each tapering abruptly into a long, linear tip, the longest 

 bract often exceeding the spike; spikes ellipsoid to ovoid, 7-9 mm. 



