ELYMUS GRAMINE^B 779 



leaves 10-20 inches long, 2-4 lines wide, smooth beneath, scabrous above, 

 gradually tapering into very acute pungent tips : spikes linear, sometimes 

 branching and panicled : spikelets 3-6-flowered, 6-12 lines long, yillous 

 with long whitish or yellowish hairs : empty glumes lanceolate, subaristate- 

 ppinted : flowering glumes broadly lanceolate, very acute, densely silky - 

 villous on the back : flowering glumes 6-7 lines long. On sand dunes along 

 the Columbia river near the Dalles. 



E. dasystachys Trin. Ledeb. Fl. Alt. i, 120. Stems stout, smooth, 

 2-3 feet high, from stout creeping rootstocks : sheaths smooth or scabrous, 

 shorter than the internodes : ligules very short : leaves rigid, more or less 

 involute, pungent-pointed, 4-18 inches long, 2-4 lines wide : spike strict, 3-6 

 inches long: spikelets 2 at each joint, 10-12 lines long, closely imbricated, 

 4-7-flowered : empty glumes, equal, 7-8 lines long, more or less cilate, 

 short-awned, narrowly lanceolate 3-nerved: flowering glumes, more or 

 less pubescent, slightly ciliate, 10-12 lines long, short-awned. Washington 

 to Alaska and Montana. 



E. littoral is Turcz. Stems rather Ptout and somewhat rigid, erect, 

 3-4 feet high, glabrous: sheaths glabrous, the lower ones ecarious, loose 

 and sometimes bladeless: ligules very short, minutely ciliate: leaves 10-20 

 inches long, 2-3 lines wide, glabrous beneath, strongly strigose-pubescent 

 above, very long acuminate-pointed, becoming involute: spikes 10-12 

 inches long, rather loosely flowered, often branched : spikelets 5-9-flowered : 

 empty glumes narrowly lanceolate, scabrous on the keel, especially toward 

 the rigid subulate apex : flowering glumes 7-9 lines long, lanceolate, very 

 acute, or subaristate-pointed, 5-nerved, scarious margined rather densely 

 pubescent on the back below, the upper third glabrous. Eastern Wash- 

 ington to Idaho. 



E. condensatus Presl Rel. Hsenk. i, 265. Stems erect, smooth, 2-10 

 feet high: sheaths glabrous, the upper ones shorter than the internodes: 

 ligules 2-3 lines long, truncate: leaves 6-20 inches long, 3-11 lines wide, 

 scabrous above : spike 4-16 inches long, usually stout, strict, often interrupt- 

 ed below, sometimes branched at the base: spikelets 3-6-flowered: empty 

 glumes subulate, 4)^-6 lines long, 1 -nerved, usually rough : flowering 

 glumes 4-5 lines long, generally awn-pointed, usually scabrous. Common 

 from eastern Oregon and Washington to Brit. Columbia, Nebraska, Arizona 

 and California. 



E. tritlcoides Buckl. Proc. Acad. Phila. 99. Stems rather slender, 

 2-4 feet high: ligules very short: leaves 7-12 inches long, narrow, often 

 involute, the upper equalling or exceeding the stem : spikes 3-8 inches long, 

 erect: spikelets 4-8-flowered, sometimes glaucous: empty glumes linear- 

 lanceolate, rigid, long-pointed, 4-6 lines long: flowering glumes firm, lan- 

 ceolate, acuminate or short-awned, 7-nerved. Washington to California 

 and the Rocky Mountains. 



E. glancus Buckl. 1. c. E. Americanus Vasey <fc Scribn. Stems 

 erect, 2-5 feet high, smooth : sheaths often shorter than the internodes, 

 usually glabrous: ligules 1 line longer less: leaves 4-12 inches long, 2-8 lines 

 wide, smooth beneath, sometimes scabrous above: spike 5-8 inches long, 

 slender: spikelets appressed to the rachis, 3-6 flowered: empty glumes 

 narrowly lanceolate, 4-6 lines long, acuminate or awn-pointed, rigid, 3-5- 

 nerved: flowering glumes smooth or slightly scabrous, 5-6 lines long: bear- 

 ing a slender straight awn 6-9 lines long. In moist soil California to Brit. 

 Columbia, Ontario, Michigan and Arizona. 



E. Canadensis L. Sp. 83. Stems erect, 2-5 feet high, smooth: sheaths 

 usually shorter than the internodes : ligules very short : leaves 4-12 inches 

 long, 5-10 lines wide, scabrous, sometimes glaucous: spike 4-12 inches 

 long, stout, often nodding: spikelets spreading, 3-5-flowered : empty 

 glumes narrowly lanceolate, or subulate, rigid, 3-5-nerved ,4-8 lines long, 



