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



unequal, the seconds 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. 01 

 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. 9i 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 spikehke, purple- tinged, 3 to 5 cm long; spikelets 3 to 4 mm 

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



