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



FIGURE 681. Distribution of 

 Agrostis rossae. 



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

 long. 9J. 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. 9|. (A. inflata 

 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.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 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.densifloraVa,- 



FlGUEE 680. 



Agrostis ros- 

 sae. Panicle, 

 X 1; glumes 

 and floret, 

 X5. Hitch- 

 cock 23 178, 

 Wyo.) 



FIGURE 683. Distribution of 

 Agrostis exarata. 



FIGURE 682. A, Agrostis exarata. Panicle, X \oi--i i 



1; glumes and floret, X 5. (Sheldon 10876, Sey.) bandy SOll and 



Oreg.) 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.) 



OT. i o^o 

 CUttS near t n 6 S 6 a, 



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 



