64 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
1. Sphenopholis obtusata (Michx.) Scribn., Rhodora 8: 144. 1906. 
PRAIRIE WEDGEGRASS. 
Aira obtusata Michx., Fl. Bor. Amer. 1: 62. 1803. Florida. 
Eatonia obtusata A. Gray, Man. ed. 2: 558. 1856. 
Culms tufted, erect, 30 to 50 cm tall; blades flat, 1 to 5 mm wide; 
panicle narrow, contracted or spikelike, more or less lobed or inter- 
rupted, 3 to 8 cm long, pale or purplish; spikelets 2 to 3 mm long; 
glumes 2.3 to 2.6 mm long; lemmas scaberulous, about 2.5 mm long, 
the third, when present, reduced (fig. 35). 
Pinelands and grassy plains, Hispaniola, at upper altitudes (1,200 
to 2,300 m); United States and Mexico. 
DominicaN Repusuic: Constanza, Tuerckheim 3319; EHkman 
H 13934. Valle Nuevo, Ekman H 13868. San José de Ocoa, Ekman 
FHSI2Z033- 
29. TRISHT UNI Perss: Syn. Pit: 97. A805 
Spikelets usually 2-flowered, sometimes 3- to 5-flowered, the rachilla 
prolonged behind the upper floret, usually villous; glumes somewhat 
unequal, acute, the second usually longer than the first floret; lem- 
mas usually short-bearded at the base, 2-toothed at the apex, the 
teeth often awned, bearing from the back below the cleft apex a 
straight and included, or usually bent and exserted, awn. Tufted 
perennials with narrow blades and mostly dense panicles. 
1. Trisetum spicatum (L.) Richt., Pl. Eur. 1: 59. 1890. 
SPIKE TRISETUM. 
Aira spicata L., Sp. Pl. 64. 1753. Lapland. 
Culms tufted, erect, 30 to 70 cm tall; sheaths pubescent; blades 
flat, pubescent, mostly basal, 1 to 3 mm wide; panicle contracted, 
dense and spikelike or somewhat lobed or interrupted, 5 to 8 cm 
long; spikelets 5 to 7 mm long (fig. 36). 
Open ground and pineland, at high altitudes, Hispaniola; Arctic 
regions of the Northern Hemisphere, extending south in the moun- 
tains to the Southern Hemisphere. 
Haiti: Grand-Gosier, Hkman H 6867. 
Dominican Repusuic: Sierra de los Comisarios, Ekman H 6803. 
Valle Nuevo, Eggers 2227, 2228; Tuerckheim 3133. San José de 
Ocoa, Ekman H 11714. 
30. DESCHAMPSIA Beauv., Ess. Agrost. 91. pl. 18. f. 3. 1812. 
HAIRGRASS 
Spikelets, 2-flowered, disarticulating above the glumes, the hairy 
rachilla prolonged behind the upper floret as a stipe, this sometimes 
bearing a reduced floret; glumes about equal, acute or acutish, 
membranaceous; lemmas thin, truncate and 2- to 4-toothed at the 
summit, bearing a slender awn from or below the middle, the awn 
straight, bent, or twisted. Slender annuals or perennials with 
shining spikelets in narrow or open panicles. 
