MANUAL OF THE GRASSES OF THE UNITED STATES 



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about 2 mm. long; blades mostly 

 basal, 3 to 5 cm. long, 1 to 2 mm. 

 wide; panicle 3 to 7 cm. long, narrow, 

 sometimes rather compact, the 

 branches erect or ascending, few- 

 flowered; spikelets mostly 2- or 3- 

 flowered, 5 to 6 mm. long; lemmas 3 

 to 4 mm. long, strongly pubescent on 

 the lower half of the keel and mar- 

 ginal nerves and often slightly pubes- 

 cent on the faint intermediate nerves. 

 % — Rocky slopes, Arctic regions 

 south to the alpine summits of New 

 Hampshire; Wisconsin; Minnesota; 

 Colorado. Common in Greenland; 

 Eurasia. 



48. Poa glaucantha Gaudin. (Fig. 

 161, B.) Plants mostly glaucous, 

 culms compressed, in tufts, usually 30 

 to 70 cm. tall, leafy throughout; 

 blades to 12 cm. long; panicle 6 to 16 

 cm. long, loose, but branches mostly 

 ascending; spikelets 5 to 7 mm. long, 

 3- to 6-flowered; lemmas pubescent 

 on keel and lateral nerves, sometimes 

 with an obscure web at base. % — 

 Mountain meadows, slopes, and cliffs, 

 Newfoundland to Quebec, Minne- 

 sota, Montana, and Wyoming; Eu- 

 rope. Resembles both Poa nemoralis 

 and P. interior, distinguished from 

 both by the florets without web at 

 base or with very obscure web, from 

 P. nemoralis by the flat culms, and 

 from P. interior by the more strongly 

 keeled sheaths and larger spikelets. 

 A variable and puzzling species, ap- 

 parently intermediate between P. 

 nemoralis and P. glauca. Poa scopu- 



lorum Butters and Abbe is an unusu- 

 ally slender lax form. 



49. Poa fernaldiana Nannf. (Fig. 

 162.) Plants in loose lax bunches; 

 culms weak and slender, 10 to 20 or 

 sometimes 30 cm. tall; ligule truncate, 

 about 1 mm. long; blades mostly 

 basal, lax, mostly about 1 mm. wide; 

 panicle narrow but loose, few-flow- 

 ered, 2 to 6 cm. long, the branches as- 

 cending, naked below; spikelets 2- to 

 4-flowered, about 5 mm. long; lem- 

 mas 3 to 3.5 mm. long, densely villous 

 on the lower half of the keel and 

 marginal nerves, sometimes sparsely 

 webbed at base. (Has been confused 

 with P. laxa Haenke, a European 

 species.) % — Rocky slopes, New- 

 foundland and Quebec to the alpine 

 summits of Maine, New Hampshire, 

 Vermont, and New York. Common on 

 the upper cone of Mount Washing- 

 ton. 



Figure 163. 



-Poa pattersoni. Plant, X 1 ; floret, X 10. 

 (Patterson 154, Colo.) 



Figure 162. 



-Poa fernaldiana. Panicle, X 1; floret, 

 X 10. (Fernald, Maine.) 



50. Poa pattersoni Vasey. Patter- 

 son bluegrass. (Fig. 163.) Culms 

 loosely tufted with numerous basal 

 leaves, 10 to 20 cm. tall; blades usu- 

 ally folded, rather lax, mostly less 

 than 10 cm. long, about 1 mm. wide; 

 panicle narrow, condensed, purplish, 



