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



spikelets 6 to 10 mm long; glumes 3 mm long, scabrous; lemmas 4 to 

 5 mm long, crisp-puberulent on the back toward base. 01 —Mead- 

 ows open woods, rocks, and hills, at low and medium altitudes, 

 western Montana and southern Washington to California; Baja 

 California (fig. 252). A form, like P. scabrella in other respects 

 but with smooth lemmas, has been differentiated as P. limosa Scribn. 

 and Will. — California (Mono Lake and Truckee). 



58. Poa gracillima Vasey. Slender bltjegrass. (Fig. 253.) 

 Culms rather loosely tufted, 30 to 

 60 cm tall, usually decumbent at 

 base; ligule 2 to 5 mm long, shorter 

 on the innovations ; blades flat or 

 folded, lax, from filiform to 1.5 

 mm wide ; panicle pyramidal, loose, 



Figure 252.— Distribution of Poa 

 scabrella. 



rather open, 5 to 10 cm long, the 

 branches in whorls, the lower in 

 twos to sixes, spreading or some- 

 times reflexed, naked below ; spike- 

 lets 4 to 6 mm long; second glume 

 3 to 4 mm long; lemmas minutely 

 scabrous, crisp-pubescent near 



Figure 254. Distribution of Poa 

 gracillima. 



base, especially on the nerves. 

 91 —Cliffs and rocky slopes, 

 Alberta to Alaska, south to Wyo- 

 ming, northern Nevada, and the 

 southern Sierras of California (fig. 

 254). Poa tenerrima Scribn. is a 

 form with open few-flowered pan- 

 icles; Southern Coast Ranges, 

 California; P. multnomae Piper is a loose lax form in which the 

 ligules on the innovations are short and truncate; wet clitts, Mult- 

 nomah Falls, Oreg. . 



59. Poa seciinda Presl. Sandberg bluegrass. (*ig. 255.) LAilms 

 erect from a dense often extensive tuft of short basal foliage, commonly 

 not more than 30 cm, but sometimes up to 60 cm tall; ligule acute, 



Era ■; lm 



Figure 253.— Poa gracillima. Plant, X 1; floret, 

 X 10. (Sandberg and Leiberg 747, Wash.) 



