154 



GBAMINEAE 



the keel above and sparingly on the back near margins ; palea ciliate on keels. 



Sand dunes along the coast, northern California to Washington. Crescent 

 City, Davy & Blasdale 5966. 



Bef. POA MACRANTHA Vasey, Bull. Torr. Club 15: 11. 1888. 



6. P. olneyae Piper. Perennial from creeping rhizomes; culms 1 to 2 feet 

 high; sheaths- smooth, or slightly scabrous; ligule about 1, line long ; blades, 

 flat or folded, smooth on lower surface; panicle pyramidal, rather open, 1 to- 

 4 inches long, the lower branches 2 or 3 in a. cluster, about an inch long, ascend- 

 ing or spreading; glumes 2 lines long, acute; lemmas nearly smooth, sparingly 

 pubescent or scaberulous on keel and marginal nerves, not webbed, the inter- 

 mediate nerves faint. 



Alpine meadows, open woods, and rocky banks in the Sierra Nevada and high 

 southern mountains; north to British Columbia and east to Montana. 



Locs. Siskiyou Co., Butler 1318; Bierstadt Peak, Davy 3228 in part; Webber Lake, Ken- 

 nedy 4- Doten 137; Truckee Biver, Sonne 4; Yosemite Nat. Park, Hall $ Babcock 3538, 3567. 

 Hitchcock 3278, 3319; Black Mts., Hall $ Chandler 610; Sequoia Nat. Park, Davidson 2109 r 

 Hitchcock 3438; Griffin, Ventura Co., Elmer 3970; San Jacinto Mts., Beed 2496, Wilder 913; 

 Fallbrook, Jones 3096. 



Eef. POA OLNEYAE Piper, Erythea 7: 101. 1899. 



7. P. atropurpurea Scribn. Perennial from creeping rhizomes; culms 1 to- 

 li/2 feet high, slender; sheaths smooth; blades mostly basal, folded or in- 

 volute, firm, smooth on under surface, the uppermost culm-leaf below the mid- 

 dle ; panicle narrow, contracted, almost spike-like, purple-tinged, 1 to 2 inches 

 long; spikelets 1% to 2 lines long, turgid; glumes broad, less than 1 line long; 

 lemmas a little over 1 line long, broad, smooth, not webbed, the nerves faint. 



Only known from the San Bernardino Mts., Parish 2477, 2968, 3696. 

 Bef. POA ATROPURPUREA Scribn. TJ. S. Dept. Agr. Div. Agrost. Bull. 11: 53. pi. 10. 1898, 

 type Parish 2968. 



8. P. compressa L. CANADA BLUEGRASS. Perennial from creeping rhizomes ; 

 culms not tufted, geniculate-ascending, flattened, wiry, bluish green, % to l 1 /^ 

 feet high ; panicle narrow, 1 to 3 inches long, the usually short branches in 

 pairs, spikelet-bearing to the base ; spikelets crowded, subsessile, 3 to 

 6-flowered, 2 to 3 lines long ; glumes about 1 line long, 3-nerved ; lemmas firm, 

 obscurely nerved, 1 to l 1 /^ lines long, .sparingly webbed at base, short-pubescent 

 below on keel and marginal nerves. 



Open ground, open woods, meadows and waste places throughout the U. S., 

 introduced from Europe. Distinguished from P. pratensis in gross appearance 

 by the color and the scattered culms. 



Bef. POA COMPRESSA L. Sp. PI. 69. 1753. 



9. P. confmis Vasey. Perennial from creeping rhizomes ; culms low, often 

 geniculate or ascending at base, usually less than 6 inches high ; sheaths and 

 involute blades smooth ; panicle narrow, contracted, % to 1 inch long, tawny ; 

 spikelets about 2 lines long; glumes unequal, the second l 1 /^ lines long; lemmas 

 l 1 /^ lines long, scaberulous, sparsely webbed at base, the nerves faint. 



Sand dunes aud sandy meadows near the coast, Mendocino Co. (Congdon) to 

 Alaska. 



Ref. POA CONFINIS Vasey, U. S. Dept. Agr. Div. Bot. Bull. 13 2 : pi. 75. 1893. 



10. P. kelloggii Vasey. Perennial from creeping rhizomes; culms 1 to 2 

 feet high, smooth, sheaths smooth, mostly basal; blades flat or folded, sca- 

 brous on upper surface ; panicle pyramidal, open, 3 to 6 inches long, the 

 branches mostly in 1's or 2's, slender, spreading or reflexed, bearing a few 



