26 



hirsute sheaths, pubescent leaves, and strongly rugose flowering glumes. This 

 specimen is cited by Grisebach, Plant. Cub. 234 (1866), under Setarla glauca 

 imberbis. 

 16. CH^TOCHLOA LEUCOPILA sp. nov. (Fig. 14.) 



A densely ctespitose, erect perennial, 2.5 to 4 dm. high, with narrow, involute leaves 

 and rather loose, narrow panicles 3 to 6 cm. in length. Culms very slender, 

 much branched at base, striate, scabrous or scabro-pubescent below the nodes 

 and panicle, otherwise smooth; nodes brown, the lower ones densely bearded 



with long white hairs, the 

 hairs on upper nodes shorter, 

 sheaths loose, compressed, 

 glabrous or usually slightly 

 scabrous on the keel, margins 

 nearly smooth below, densely 

 ciliate-fringed with long white 

 hairs above ; ligule brown, very 

 short, densely ciliate with 

 spreading white hairs 3 t© 5 

 mm. long; basal leaves numer- 

 ous, those of the culms 1 or 

 2, linear, 5 to 10 cm. long, 2 

 to 4 mm. wide, rather soft, 

 becoming involute-setaceous, 

 densely bearded at the throat 

 with spreading white hairs, 

 which equal or exceed those 

 of the ligule, the upper sur- 

 face pilose with long white 

 hairs, the lower surface smooth 

 or only slightly scabrous. 

 Panicle somewhat exserted, 

 about6 mm. in diameter, pale, 

 few-flowered; axis undulate, 

 angular, scabro - pubescent, 

 branches 2 mm. long or less; 

 setffi single or in pairs, green, 

 flexuous, antrorsely scabrous, 

 2 to 5 mm. long. Spikelets 

 oblong-ovate, acute, 3-nerved, 

 barely 2 mm. long; firstglume 

 triangular - ovate, acute, 3- 

 nerved, one-third as long as the 

 spikelet; second glume broad- 

 ly ovate, obtuse, apiculate, 5- 

 nerved, two-thirds to three- 

 fourths as long as the flowering glume; third glume equaling the flowering 

 glume, 5-nerved, subtending a hyaline, lanceolate palea two-thirds its own 

 length; flowering glume narrowly ovate, acute, apiculate, nearly smooth, striate 

 and pitted below, not rugose, nearly smooth, sliining at the apex, the inclosed 

 palea broadly lanceolate, pitted, slightly convex for its whole length. 

 Mexico. Type specimen collected at Parras, State of Coahuila, Mexico, 1363 E. 



Palmer, June, 1880. 

 At once distinguished by its densely caespitose habit, narrow leaves, densely bearded 

 ligule, and pilose sheath margin, and leaves. 



Fio. 14. — Ckcetochloa leucopila: a, spikelet showing seta; 

 I), c, views of the spikelet ; d, anterior view of the flower- 

 ing glume, showing the sterile and fertile palea; e, flower- 

 ing glume, dorsal view. 



