GRAMINEAE (GIIASS FAMILY) 59 



acute; lemma nearly as long, 2-toothed ai apex; awn very slender, attached 

 near the middle, about as long as its lemma; palet shorter than the lemma; 

 callus hairs as long as the glumes. — Across the continent northward; frequent 

 in our range. 



■2a. Calamagrostis canadensis acuminata Vasey, Bull. U. S. Div. Agrost. 

 5: 23. 1897. Sheathsrarely slightly bearded at junction with the blade vifhich 

 is short-scabro-pubescent above, panicle smaller, more flexuous and densely 

 flowered, usually dark purple: spikelets 3.5-4 mm. long: glumes attenuate- 

 acuminate, sometimes subfalcate, very scabrous or substrigose; awn longer 

 than the lemma. — ^The more usual form in our range. 



3. Calamagrostis Suksdorfii Vasey, Monog. Grasses U. S. 82. 1892. 

 Culms tufted, 5-8 dm. high: leaves of culm mostly 3, 12-15 cm. long, with 

 slender, acuminate points; upper ligules 3-5 cm. long, the lower sheaths 

 shorter and the upper longer than the internodes: panicle erect, 6-12 cm. 

 long, moderately close, pale or purplish; the rays glomerate, unequal, the 

 shorter ones crowded with the almost sessile spikelets: glumes 3-4 mm. long, 

 acute, whitish, translucent, smooth except on the midnerve; lemma thin, 

 4-nerved.and 4-tootlied, shorter than the glumes; palet about as long as its 

 lemma, 2-toothed; hairs of callus very short. — Northwestern Wyoming to 

 California and Washington. 



4. Calamagrostis purpurascens R. Br. Rich. App. Frank. Journ. 731. 

 1823. Culms tufted, erect, rigid, 3-5 dm. high: leaves numerous, crowded 

 near the base, rigid; the radical half as long as the culm; the upper attenuate- 

 pointed, very scabrous, thick and involute; ligule truncate or lacerate; sheath 

 rough, striate: panicle spike-like, dense, generally purplish; rays mostly in 

 fives, appressed: spikelets 5-6 mm. long: glumes ovate-lanceolate, acute, 

 4-toothed; the awh neai: the base, twisted below and bent at the. middle, 

 longer than the glumes; hairs of the callus scanty and very short.— From 

 Colorado far northward, and thence across the continent. 



5. Calamagrostis montanensis Scribn. Vasey, 1. c. Culms stoloniferous, 

 2-3 dm. high, rather rigid, erect: radical leaves involute-setaceous, 12-15 cm. 

 lDng;"Culili' leaves similar but shorter, scabrous: panicle linear to oblong, 

 5-7 cm. lolig;' rays ■ short, fascicled: glumes narrowly lanceolate, acute, 4-5 

 mm. long; With the pfedicels scabrous, whitish; lemma shorter bifid; hairs of 

 callus much shorter than the gllime. — ^Wyoming to Canada and west to the 

 Pacifift. 



6; Calamdgrbstis neglecta (Ehrh.) Gaertn. Fl. Wetterau 1: 94. 1799. 

 Glabrous throughout: culms 4-6 dm. high, erect, simple, slender: sheaths 

 shorter than, the internodes; leaves narrow; the basal one third as long as the 

 culm;l;hose iof the culm 4-10 cm. long, erect: panicle contracted, 5-10 cm. 

 long; the rays erect, 2-3 cm. long: spikelets 4 mm. long: glumes scabrous; 

 lenkma 'bbtuss, shorter than the glumes, its awn exceeding the body. — Colo- 

 rado and far'northwa;rd and thence across the continent. 



^7. Calamagrostis hyperboreaLange,Fl. Dan. 50: t. 3. 1880. Culms densely 

 tufted, rigid, stout, 4-10 dm. high: sheaths smooth and glabrous; leaves stiff 

 and very rough on both surfaces, flat, or often! involute at the tip, 1-3 dm. 

 long: panicle contracted, 7-14 cm. long, its branches short; usually erect: 

 spikelets 3—1 min. long: glumes scabrous, acute; lemma nearly as long and 

 usually equaled by the callus hairs; awn about as long as the lemma. — Colo- 

 rado to Greenland and Alaska. 



7a. Calamagrostis hyperborea elongata Kearney, Rev. Calamagr. 41. 

 1898. Taller and less tufted. 



7b. Calamagrostis hyperborea americana (Vasey) Kearney, 1. c. Panicle 

 very dense and the spikelets usually only 3 mm. lo'ng. — This form occurs very 

 frequently in our range. 



8. Calamagrostis inexpansa Gray, Gram. & Cyp. 1 : No. 20. 1834. Culms 

 but little' tufted, 8-12 dm. high: sheaths smooth and glabroijs; leaves rough, 

 2-3 dm. long: panicle 15-20 cm. long, usually nodding at the summit, the rays 

 rathfer long, ferect'; spikelets 4-5 mm. long: glumes rigid, hispid on the keel, 

 acute; lemma scabrous; caUus hairs aa long as the glume or shorter; awn 



