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



Figure 681.— Distribution of 

 Agrcstis rossae. 



Figure 680 — 

 Agrostis ros- 

 sae. Panicle, 

 X 1; glumes 

 and floret, 

 X5. Hitch- 

 cock 23178, 

 Wyo.) 



Figure 683.— Distribution of 

 Agrostis exarata. 



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

 long. % — 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. % (A inflata 

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



\ to California. Agrostis exarata var. ampla (Hitchc.) 



Hitchc. Robust, panicle large, 

 rather loose, lemma awned. 91 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.Jilicul- 

 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 tall; 

 sheaths sometimes slightly scabrous ; 

 ligule truncate, usually shorter than 

 in A. exarata, puberulent; blades 

 flat, firm, strongly nerved on the 

 upper surface, usually not more than 10 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. 

 % (A. densifloraVsi- 

 sey.) — Sandy soil and 

 cliffs near the sea, 

 Mendocino County 

 to Santa Cruz, Calif. This 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 open, 10 to 30 cm long, the branches 



n.\"WIW« I/. \ 



Figure 682.-^4, Agrostis 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 

 californica. Panicle, 

 X 1; glumes and 

 floret, X 5. (Ander- 

 son, Calif.) 



