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



'V& 



Figure 674.— Agrostis hallii. Pan- 

 icle, X l; glumes and floret, X 5. 

 (Bioletti 110, Calif.) 



17. Agrostis lepida Hitchc. (Fig. 675.) Culms tufted, 30 to 40 

 cm tall, erect, with numerous short rhizomes; ligule, at least on the 



innovations, as much as 4 mm long; leaves 

 mostly basal, the blades firm, erect, flat or 

 folded, the upper culm leaf below the middle 

 of the culm, the blade 3 cm long or less; 

 panicle purple, 10 to 15 cm long, the branches 

 verticillate, becoming divaricately spread- 

 ing, the lowermost 2 to 5 cm long; glumes 

 3 mm long, smooth or nearly so; lemma 2 

 mm long; palea wanting or very minute. 

 Q[ — Meadows and open woods, Sequoia 

 National Park, and San Bernardino Moun- 

 tains, Calif., at upper altitudes. 



18. Agrostis pallens Trin. Dune" bent. 

 (Fig. 676.) Culms erect, 20 to 40 cm tall, 

 with creeping rhizomes; ligule rather firm, 

 2 to 3 mm long; blades flat or somewhat 

 involute, 1 

 to 4 mm 

 wide; pan- 

 icle con- 

 tracted, almost spikelike, 5 to 10 cm 

 long; glumes 2.5 to 3 mm long; lem- 

 ma a little shorter than the glumes, 

 awnless; palea wanting. <2l — 

 Sand dunes along the jcoast,- Wash- 

 ington to central California. Prob- 

 ably only a seacoast form of A. 

 diegoensis. 



19. Agrostis diegoensis Vasey. 

 Thingrass. (Fig. 677.).' Culms 

 erect, as much as 1 m tall with creep- 

 ing rhizomes; blades flat, lax, 2 to 6 

 mm wide; panicle narrow, open, 10 

 to 15 cm long, the branches ascend- 

 ing, rather stiff, some of them naked 

 below; spikelets about as in A. pal- 

 lens, awned or awnless. % — 

 Meadows and open woods at low 

 and medium altitudes, Montana and 

 British Columbia to southern Cali- 

 fornia and Nevada (fig. 678). 



20. Agrostis blasdalei Hitchc. 

 (Fig. 679.) Culms 10 to 15 cm tall, 

 densely tufted; blades narrow or 

 filiform, rigid, involute, 2 to 4 cm 

 long; panicle strict, narrow, almost 

 spikelike, 2 to 3 cm long, the short 

 branches closely appressed; spikelets 

 2.5 to 3 mm long; lemma about 1.8 

 mm long, awnless or with a very 

 short awn just above the middle; palea about 0.3 mm long, nerveless. 

 Ql —Cliffs near Fort Bragg, Mendocino County, Calif. Previously 

 referred to A. breviculmis Kitchc. of Peru. 



Figure 675. — Agrostis Upida 

 glumes and floret, X 5. 



Plant, X W, 

 (Type.) 



