MANUAL OF THE GRASSES OF THE UNITED STATES 



439 



Figure 627. — Oryzopsis he?idersoni. Plant, X J^ ; 

 spikelet and floret, X 5. (Type.) 



lemma appressed-pilose, about as 

 long as the glumes, the awn about 

 5 mm. long, not twisted, geniculate. 

 % — Dry open ground or open 

 woods, at moderately high altitudes, 

 Montana to Washington, south to 

 Colorado, Nevada, and Oregon. 



5. Oryzopsis pungens (Torr.) 

 Hitchc. (Fig. 629.) Culms tufted, 

 erect, slender, 20 to 50 cm. tall; 

 blades elongate, slender, flat or in- 

 volute, less than 2 mm. wide; pan- 

 icle narrow, 3 to 6 cm. long, the 

 branches erect or ascending or spread- 

 ing in anthesis; spikelets long-pedi- 

 celed; glumes 3 to 4 mm. long, ob- 

 scurely 5-nerved, obtuse; lemma about 

 as long as the glumes, rather densely 

 pubescent, the awn usually 1 to 2 

 mm. long. % — Sandy or rocky 

 soil, Labrador to British Columbia, 

 south to Connecticut, Indiana, South 

 Dakota, and Colorado. 



M 



Figure 628. — Oryzopsis exigua. 

 Panicle, X 1; floret, X 5. (Nelson 

 6511, Wyo.) 



Figure 629. — Oryzopsis 

 pungens. Panicle, X 1 ; 

 floret, X 5. (Grout, Vt.) 



6, Oryzopsis canadensis (Poir.) 

 Torr. (Fig. 630.) Culms slender, 

 tufted, erect, 30 to 70 cm. tall; 

 ligule about 2 mm. long; blades flat 



