108 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



unequal, the second 3 mm long; lemmas 3 mm long, scaberulous, 

 sparsely webbed at base, the nerves faint; pistillate florets with minute 

 abortive anthers, the staminate often with rudimentary pistil. 91 

 — Sand dunes and sandy meadows near the coast, British Columbia 

 to Mendocino County, Calif. 



11. Poa rhizomata Hitchc. (Fig. 174.) Culms tufted with numer- 

 ous innovations, 40 to 60 cm tall; lower sheaths usually scaberulous 

 with a puberulent collar; ligule rather prominent on the culm leaves, 

 inconspicuous on the leaves of the innovations; blades involute or 

 sometimes flat, firm, less than 1 mm thick, flexuous, mostly basal, 2 on 

 the culm, usually puberulent on the 

 upper surface; panicle open, 5 to 8 

 cm long, the lower branches mostly 

 in pairs, 2 to 3 cm long; spikelets, 



Figure 171.— Poa macrantha. Plant, X 1; floret, X 10. 

 (Hitchcock 2822, Oreg.) 



Figure 172.— Poa douglasii. Plant, X 1; 

 floret, X 10. (Bolander 6074, Calif.) 



3- to 5-flowered, 6 to 10 mm long; glumes 3 to 5 mm long; lemmas 4 

 to 5 mm long, with a rather short web at the base, scaberulous at 

 least on the rather distinct nerves, pubescent on the lower part of 

 keel. % — Dry slopes, southwestern Oregon and northwestern 

 California; apparently rare. 



12. Poa atropurpurea Scribn. (Fig. 175.) Culms erect, 30 to 

 40 cm tall; blades mostly basal, the uppermost culm leaf below the 

 middle of the culm, folded or involute, firm; panicle contracted, 

 almost spikelike, purple-tinged, 3 to 5 cm long; spikelets 3 to 4 mm 

 long, rather thick; glumes broad, less than 2 mm long; lemmas about 



