MANUAL OF THE GRASSES OF THE UNITED STATES 



159 



pilose in the throat, sometimes along the margin and on sides at 

 summit; blades subinvolute, 10 to 25 cm long, 1.5 to 3 mm wide, 

 pilose on the upper surface toward base, rarely beneath; panicle 

 rather diffuse, 15 to 30 cm long, about two-thirds as wide, the axis 

 and ascending to spreading branches capillary, flexuous, the lower 

 branches in pairs or verticils, the axils except upper, conspicuously 

 long pilose; spikelets on long pedicels, mostly glossy drab, 3- to 

 7-flowered, 3 to 5 mm long, 1 to 1.2 mm wide; glumes thin, 0.7 and 

 1.2 mm long, falling early; lemmas 



closely imbricate, 1.3 to 1.5 mm long, ^ ^ ^ ^^ 7 ~ 7—-—~^Jr~ 



abruptly acute; grain about 0.7 mm 



long. 91 — Dry prairie, Texas; also 

 on ballast, Mobile, Alabama; Vene- 

 zuela to Argentina. 



32. Eragrostis trichocolea Hack, and 

 Arech. (Fig. 319.) Perennial; culms ^uresis £g«™g . wcM^Pamcie, 

 erect, 30 to 60 cm tall, the leaves 



rather short, mostly crowded at the base; sheaths, at least the lower, 

 spreading, pilose ; blades spreading, flat or, especially on the innova- 

 tions, involute, mostly 8 to 12 cm long, 2 to 4 mm wide, pilose; 

 panicle diffuse, 15 to 20 cm long, nearly or quite as wide, the branches 



Figure 320— Eragrostis erosa. Panicle, X 1. (Skehan 58, N.Mex.); floret, X 10. (Type.) 



stiffly and widely spreading, pilose in the axils; pedicels 2 or 3 times 

 as long as the spikelets; spikelets 3- to 5-flowered, 3 to 4 mm long, 

 about 1.5 mm wide; glumes 1 to 1.2 and 1.3 to 1.5 mm long; lemmas 

 about 1.5 mm long. % — Sandy woods, Florida (Tampa, Lake- 

 land) ; Mexico to Uruguay. 



33. Eragrostis erosa Scribn. (Fig. 320.) Perennial; culms tufted, 

 erect, 50 to 90 cm tall; blades mostly involute; panicle diffuse, less 

 than half the entire height of the plant, usually about one-third, 



65974°— 35 



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