GRASS FAMILY 



207 



26. Poa sandbergii \'ase\ 

 Sandberg's Bluegrass 



Fig. 478. 



Poa sandbergii Vasey, Contr. U. S. Nat. Herb. 1: 276. 1893. 

 Poa incurva Scribn. & Williams, U. S. Dept. Agr. Div. Agrost Circ. 

 9: 6. 1899. 



Similar to P. scabrella; dififering in being smooth, 

 averaging lower and more slender, the panicle smaller, 

 the blades short and soft, often involute. A very vari- 

 able species, sometimes in small tufts of one or two culms, 

 sometimes in large tussocks 30 cm. in diameter. The blades 

 of the basal tuft are usually curly at maturity. 



Plains, dry woods, and rocky slopes, in the Arid Transition 

 and Canadian Zones; British Columbia to the mountains of south- 

 ern California, east to Wyoming. June-Aug. Type locality: Lewis- 

 ton, Idaho. 



27. Poa canbyi (Scribn.) Piper. 

 Canby's Bluegrass. Fig. 479. 



Glyceria canbyi Scribn. Bull. Torrey Club 10: 77. 1883. 



Airopis canhyi Beal, Grasses N. Am. 2: 580. 1896. 



Poa leckenbyi Scribn. U. S. Dept. Agr. Div. Agrost. Circ. 9: 



2. 1899. 

 Poa wyomingcnsis Scribn. Proc. Davenport Acad. Sci. 7: 



242. 1899. 

 Poa canbyi Piper, Contr. U. S. Nat. Herb. 11: 132. 1906. 



Perennial ; culms tufted, erect, smooth, 50-120 cm. 

 tall; sheaths smooth or slightly scabrous; ligule 

 2-5 mm. long; blades scabrous above, usually flat. 

 1-2 mm. wide, those of the culm usually 2, the basal 

 rather long; panicle narrow, compact or somewhat 

 loose, 10-15 cm. long, the branches short and ap- 

 pressed ; spikelets pale or purplish, 3-5-flowered ; 

 lemmas rounded on the back, faintly nerved, pu- 

 bescent on the lower part. 



Sandy or dry ground, valleys and cliffs, in the Arid 

 Transition Zone; eastern Washington and Oregon. May- 

 Tune. Type locality: Cascade Mountains, Washington. 



28. Poa nevadensis Vasey. 

 Nevada Bluegrass. Fig. 480. 



Atrofis paucifiora Thurb. in S. Wats. Bot. Calif. 2: 310. 1880, 



not Poa paucifiora Roem. & Schult. 1817. 

 Poa nevadensis Vasey; Scribn. Bull. Torrey Club 10: 66. 



1883. 

 Paniciilaria thurbcriana Kuntze, Rev. Gen. PI. 2: 783. 1891. 

 Poa thurberiana Vasey, U. S. Dept. Agr. Div. Bot. Bull. 



13-: pi. 84. 1893 (as to name). 



Tufted perennial; culins 50-100 cm. tall, smooth; 

 sheaths scabrous ; ligule 4 mm. long, decurrent ; 

 blades scabrous, usually firm, involute; panicle nar- 

 row, 10-15 cm. long; spikelets 6-8 mm. long, narrow ; 

 glumes narrow, the second 3 mm. long ; lemmas 

 smooth or scaberulous, not pilose nor webbed, 3 

 mm. long. 



Plains and meadows, in the Upper Sonoran Zone; eastern 

 Washington (Bingen, Siiksdorf) to southern California, east 

 to Colorado. July-Aug. Type locality: "California," accord- 

 ing to type specimen. 



