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. 2i 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 BLUEGRASS. (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 Poo 

 gracillima. 



base, especially on the nerves. 

 21 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 cliffs, Mult- 

 nomah Falls, Oreg. 



59. Poa secunda Presl. SANDBERG BLUEGRASS. (Fig. 255.) Culms 

 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, 



FIGURE 253. Poa gracillima. Plant, X 1; floret, 

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



