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



FlGTJBE 196.— Distribution of 

 Poa languida. 



mostly in twos^or threes, ascending, few-flowered toward the ends; 



spikelets 2- to 4-flowered, 3 to 4 mm long; lemmas 2 to 3 mm long, 



glabrous except the webbed base, oblong, rather obtuse, at maturity 



firm. QI (P. debilis Torr., not Thuill.)— Dry 

 or rocky woods, Newfoundland and Quebec to 

 Wisconsin, south to Pennsylvania, Kentucky, 

 and Iowa (fig. 196). 



26. Poa saltuensis Fern, and Wieg. (Fig. 

 197.) Resembling P. languida; differing in 

 the thinner, acute, somewhat longer lem- 

 mas. QI — Woodland thickets, Quebec 

 and Newfoundland to Minnesota, south to 



Connecticut and Maryland (fig. 198). 



27. Poa occidentalis Vasey. New Mexican bluegrass. (Fig. 

 199.) Culms erect, few in a tuft, usually rather stout, scabrous, as 

 much as 1 to 1.5 m tall; sheaths somewhat keeled, retrorsely 

 scabrous (sometimes faintly so); ligule 2 to 8 mm long; blades sca- 

 brous, 10 to 20 cm long, 3 to 6 mm wide; panicle open, 15 to 30 cm 

 long, the branches 

 in distant whorls 

 of threes to fives, 

 spreading to re- 

 flexed, the lower as 

 much as 10 cm long, 

 spikelet-bearing to- 

 ward the ends; 

 spikelets 3- to 6- 

 flowered; lemmas 

 4.5 to 5 mm long, 

 conspicuously web- 

 bed at base, villous 

 on the lower part of 

 the keel and the 

 marginal nerves and sometimes sparingly pubescent on the inter- 

 nerves below. Qi — Open woods and moist banks at medium alti- 

 tudes, Colorado and New Mexico (fig. 200). 



28. Poa tracyi Vasey. (Fig. 201.) Culms erect, 60 to 80 cm tall; 

 sheaths glabrous, keeled; ligule truncate, about 2 mm long; blades 

 3 to 5 mm wide; panicle narrowly pyramidal, 15 to 20 cm long, the 

 branches in distant whorls of 2 to 5, spreading, naked on the lower 



half or two-thirds; spikelets 2- or 3 -flowered; 

 lemmas about 3.5 mm long, oblong-lanceolate or 

 the upper lanceolate, webbed at base, villous on 

 keel and marginal nerves, and more or less so on 

 the internerves below, the intermediate nerves 

 distinct. 01 — Known only from Raton, 

 N.Mex. Mav be a form of P. occidentalis. 



29. Poa sylvestris A. Gray. (Fig. 202.) 

 Culms tufted, erect, 30 to 100 cm tall; sheaths 

 glabrous or rarely pubescent, the lower usually antrorsely scabrous; 

 ligule about 1 mm long; blades lax, 2 to 6 mm wide; panicle erect, 10 

 to 20 cm long, much longer than wide, the slender flexuous branches 

 spreading, usually 3 to 6 at a node, the kower usually reflexed; 



Figure 197.— Poa saltuensis. Panicle, X 1; floret, X 10. (Fernald and 



Pease 24875, Que.) 



Figure 198.— Distribution of 

 Poa saltuensis. 



