GRAMINEAE (GRASS FAMILY) 59 



acute; lemma nearly as long, 2-toothed at 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: 26. 1897. Sheaths rarely slightly bearded at junction with the blade which 

 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-toothed, 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 awn near 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. 

 long, culm leaves similar but shorter, scabrous: panicle linear to oblong, 

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

 mm. long, with the pedicels scabrous, whitish; lemma shorter bifid; hairs of 

 callus much shorter than the glume. Wyoming to Canada and west to the 

 Pacific. 



6. Calamagrostis 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; those of 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; 

 lemma obtuse, shorter than the glumes, its awn exceeding the body. Colo- 

 rado and far northward and thence across the continent. 



7. Calamagrostis hyperborea Lange, 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 34 mm. 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 elongate Kearney, Rev. Calamagr. 41. 

 1898. Taller and less tufted. 



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

 very dense and the spikelets usually only 3 mm. long. 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 glabrous; leaves rough, 

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

 rather long, erect: spikelets 4-5 mm. long: glumes rigid, hispid on the keel, 

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



