336 MISC. PUBLICATION 200, TJ. S. DEPT. OF AGRICULTUKE 



of the back a straight or bent exserted awn; palea less than 0.5 mm 

 long. 01 — Moist or rather dry open ground, at low and medium 

 altitudes, western Nebraska to Alberta and Alaska, south to New 

 Mexico, California, and Mexico (fig. 683). A variable species. 

 Agrostis exarata var. monolepis (Torr.) Hitchc. (Fig. 682, B.) 

 Panicle narrow, often interrupted, lemma awned. 01 (A inflata 

 Scribn., A. exarata var. microphylla Hitchc.) — Washington 



Figure 680 — 

 Agrostis ros- 

 sae. Panicle, 

 X 1; plumes 

 and floret, 

 X5. Hitch- 

 cock 23178, 

 Wyo.) 



to California. Agrostis exarata var 

 Hitchc. Robust, panicle large, 

 rather loose, lemma awned. 01 A. 

 grandis Trin. is a form with dense 

 panicle as much as 30 cm long. A. 

 scouleri Trin. is a northern form with 

 somewhat open panicle. A. filicul- 

 mis Jones is a slender form with 

 narrow blades and slender few- 

 flowered panicle. 



23. Agrostis californica Trin. 

 (Fig. 684.) Culms tufted, usually 

 rather stout, erect or somewhat 

 spreading at base, 15 to 60 cm tali; 

 sheaths sometimes slightly scabrous ; 

 ligule truncate, usually shorter than 

 in A. exarata, puberulent; blades 

 flat, firm, strongly nerved on the 

 surface, usually not more than 10 cm 



ampla (Hitchc.) 



Figure 6S1 — Distribution of 

 Agrostis rossae. 



Figure 683.— Distribution of 

 Agrostis exarata. 



upper suriace, usuany nor, more wiau iu cm long, those of the 

 culm comparatively broad and short, often 3 to 5 cm long and 3 to 5 

 mm wide, rarely as much as 10 mm wide; panicle dense, spikelike, 

 sometimes slightly interrupted, mostly 2 to 10 cm long and 5 to 15 mm 



wide; spikelets about 

 3 mm long; glumes 

 acute or acuminate, 

 prominently scab- 

 rous on the keel and 

 strongly scabrous on 

 the sides; lemma a 

 little shorter than the 

 glumes, awnless or 

 with a straight awn 

 from minute to some- 

 what exceeding the 

 glumes; palea one- 

 fourth to one- third as 

 long as the lemma. 

 01 (A.densifloraVa- 

 sey.) — Sandy soil and 

 cliffs near the sea, 

 Mendocino County 

 to Santa Cruz, Calif. Tins species has been confused with A. exarata 

 and with A. glomerata (Presl) Kunth of Peru, which is referable to 

 A. tolucensis H.B.K. 



24. Agrostis howellii Scribn. (Fig. 685.) Culms erect or decum- 

 bent at base, 40 to 60 cm tall; blades lax, as much as 30 cm long, 

 3 to 5 mm wide; panicle loose and opeD, 10 to 30 cm long, the brar>che5 



Figure 682.— A, A grostis exarata. Panicle, X 

 1; glumes and floret, X 5. (Sheldon 10876, 

 Oreg.1 B, Var monolepis. Panicle, X 1; 

 glumes and floret, X 5. (Congdon, Calif.). 



Figure 684.— Agrostis 

 calijormca. Panicle, 

 X 1; glumes and 

 floret, X 5. (Ander- 

 son, Calif.) 



