274 GKAMliNE.K. Ayrvstis. 



On the Upper TiKilmniie, at 10,000 feet altitiule, iiiul Mount Dana (Bulandci); t'ulaveras 

 Grove, Ilillcbrand. The spfLiiiieiis tioiii tliese localities, dilieiiiii^ in the jianiile, which is spivad- 

 inj< in some iimi narrow in otlicis, all a;;ree with the itocky Mountain specimens (" Kocky Mts., 

 217 Hooker") in llerh. Torr., wliich Trinius (piotes us the original of the species. Aeconling 

 to Trinius tlie upjier palet is sometimes present. 



8. A. elata, Tiin. Culm erect from a perennial root, rather stout, 2 or 3 feet 

 high, bmouth : radical leaves 4 to G inches long, very narrow, those below becoming 

 involute, the upper ones Hat, 3 to G inches long and 1 or 2 lines wide, scabrous 

 especially below ; ligules long, the upi)er 2 to 3 lines, acuminate ; sheaths nearly 

 smooth : panicle spieading, elongated (G to 9 inches), green or ])urplish, the rays 

 scabrous, about '1\ inches long, in clusters of 5 to 7 below and in jiairs above, at 

 intervals on the axis of about 2 inches, branching above the middle: spikelets 1^ 

 lines long, somewhat crowded on the branches, on pedicels shorter than or twice 

 their own length : glumes very acute, strongly rougliened on the keel, the lower 

 slightly longer and a little exceeding tiie lloret : lower palet with a few very minute 

 hairs at base, obtuse; upper palet wanting. — Agrost. ii. 71 ; (iray, Manual, Gil. 

 A. vulgaris, IjoI. (Jat. 34. 



Yosemite Valley {Bohindcr, n. 6103) ; near Wahoe Lake, Nevada, Dr. Torrni. On the Atlantic 

 coast I'rom New Jersey southward. 



++ ++ Spikelets aimless or short-awn eiL 



9. A. SCabra, AVilld. (Haiu-Ouahs. Fly-away-CIhas.s.) Cidm slender, enct, 

 1 to 2 feet higii : leaves short and narrow, mostly involute, the radical very slender, 

 the ui)permost 1 to 3 inches long, scabrous ; ligule of the upper leaves nearly a line 

 long, the lower short; sheaths slightly roughened: panicle mostly purplish, very 

 loose, 6 to 12 inches long or more; lower rays in clusters of G or more, the upper- 

 most in pairs, all rough with minute bristles while the common axis is smooth, 

 capillary, branched abuve the middle, the subdivisions llower-bearing toward the 

 summit : spikelets a line long, mostly on longer pedicels : glumes uuecpial, the lower 

 longer, very acute, scabrous and often greenish on the keel : lower jialet shorter than 

 the glumes, very thin, sometimes short-awned, the ui)per when present very minute. 

 — Trichodium laxijiorum, JNIichx. Flora, i. 42, t. 8. A. laxijlura, Ivich. ; K until, 

 («rara. t. 130. A. Michaujcii, Trin. Agrost. ii. 79. A. scairiiiscula, Ihickl. I'roc. 

 Acad. Philad. 18G2, 90. 



Occurs in all tlie collections, being common, an<l extending northward to Alaska, as well as 

 quite across the continent from east to west ; also in Siheria. This, which is ])robably a biennial, 

 when young has its long rays erect and apj)ressed, presenting a very dillerent appearance t'rom the 

 mature plant with the jianiele fully developed and the branches diveigently sjireading ; when 

 ripe the panicles break away and are blown to long distances. 



++++++ Spikelet awned. 



10. A. canina, J>inn. (1>rown Bent-(Ika«s.) (.'ulms G to 24 inches high, 

 sometimes stoloniferous : radical leaves involute-setaceous, those of the culm Hat, 

 a line broad or less ; ligule obtuse ; sheath mostly longer than the internodes, smooth : 

 panicle 2 to G inches long, spreading, the uneipial rays in clusters of five below, iu 

 pairs or solitary abuve, roughened, branching above the middle : spikelets purple or 

 brownish, 1 to H lines lf>ng, on shorter or longer pedicels : glumes slightly unecpial, 

 very acute : lower palet one-third shorter than the glumes, bearing on the back at 

 or below the middle a more or less exserted and bent awn ; upper palet wanting or 

 very small. — Keichenb. Icon. Fl. Germ. i. 8, t. 74. 



Mendocino County {Bohindcr), and northward to Oicgon and Alaska. .\ jioiennial siieeies 

 found in nearly every ]iait of the world and, especially the mountain forms, with many synonyms. 

 Of little or no agricidtural value. 



11. A. Virescens, Hl'.K. Culm 1 to 2 feet high or more, ])erennial : leaves 

 erect. Hat, aliout (i inidies hmg and 4 lines broad, rough on both sides ; ligule over 

 a line long, truncate; sheaths much shorter than the internodes, mostly smooth: 



