60 GRAMINEAE (GRASS FAMILY) 



variable, sometimes exceeding the lemma. From our range to the Atlantic 

 States. 



9. Calamagrostis scopulorum Jones, Proc. Cal. Acad. Sci. II. 5: 722. 1895. 

 Culms densely tufted, 5-7 dm. high: leaves coarse, striate-nerved, 6 mm. 

 broad and about 3 dm. long; ligule scabrous: inflorescence spicate, 8-15 cm. 

 long; rays about 5, pubescent: spikelets pale, appressed, about 4 mm. long: 

 glumes equal, ovate-lanceolate, acute, glabrous and hyaline except the sca- 

 brous nerve; lemma 4-toothed at apex, scabrous throughout, equaling the 

 glabrous 2-toothed hyaline palet; callus hairs shorter than the palet. South- 

 western Colorado to Nevada. 



31. CALAMOVILFA Hack. 



Rather tall, rigid perennials with stout horizontal rootstocks, elongated 

 leaves and loosely spreading panicles. Spikelets 1-flowered, the rachilla not 

 prolonged beyond the flower. Glumes 1-nerved, acute, unequal; lemma 

 longer or shorter than the second glume, with a ring of hairs at the base ; palet 

 strongly 2-keeled. Stamens 3. Styles distinct; stigmas plumose. Grain free. 



1. Calamovilfa longifolia (Hook.) Hack. True Grasses 113. 1890. Culms 

 3-9 dm. long, erect, simple, stout, smooth and glabrous: sheaths crowded and 

 overlapping, glabrous or rarely pilose; leaves 2-3 dm. long or more: panicle 

 narrow, often 3 dm. long or more, pale, the branches erect or ascending, the 

 lower 10-25 cm. long: spikelets 6-8 mm. long: glumes acute, smooth, the first 

 shorter than the second; lemma a little longer or slightly shorter than the 

 second glume, and nearly twice the length of the copious basal hairs; palet 

 slightly shorter than the lemma. Sandy soil; more or less frequent through- 

 out our range. 



32. DESCHAMPSIA Beauv. HAIR GRASS 



Annuals or perennials with flat or involute leaves, and rather small, shining 

 spikelets in terminal or lateral, narrow or loose panicles. Spikelets 2-flowered, 

 both flowers perfect, the hairy rachilla extended beyond the flowers or rarely 

 terminated by a staminate one. Glumes keeled, acute, membranous, shining, 

 persistent; the lemmas of about the same texture, deciduous, bearing a dorsal 

 awn, the apex toothed ; palet narrow, 2-nerved. Stamens 3. Styles distinct; 

 stigmas plumose. Grain oblong, free, inclosed in the lemma. 



Panicle open, its branches spreading . . . . . . . 1. D. caespitosa. 



Panicle strict, its branches erect or appressed . . . . 2. D. elongata. 



1. Deschampsia caespitosa (L.) Beauv. Agrost. 91, t. 18. 1812. Densely 

 caespitose, with very numerous basal leaves: stems erect, slender, 6-10 dm. 

 high: sheaths much shorter than the internodes; leaves flat, smooth beneath, 

 scabrous above; the basal about one third as long as the stem: panicle open, 

 8-15 cm. long, the branches widely spreading, often somewhat flexuous, the 

 lower 5-12 cm. long: spikelets 3-4 mm. long: glumes unequal, 1-3-nerved, 

 lanceolate, acute; lemmas oblong, erose, truncate at the apex; awn straight, 

 inserted above the middle, 2-4 mm. long. Frequent in moist meadow-like 

 grounds; throughout our range, far northward and across the continent. The 

 species i> variable and some varieties have been named, but they are in turn 

 variable. 



!. Deschampsia elongata (Hook.) Munro, in Benth. PL Hartw. 342, t. 228. 

 ls.~>7. Culms slender, tufted, 2-4 dm. high: leaves narrow, mostly smooth, 

 1 1(l ''" l"g: panicle narrow, simple or branching, about one third as long 

 Mltfl culm; the rays capillary, scabrous, appressed, bearing spikelets from the 

 middle up: glumea equal, ovate-lanceolate or narrower, 3-nerved, green and 

 scabrous on the keel; lemma broad, 5-toothed, indistinctly or not nerved; 

 palet 2- toothed; a\\n slender, from near the base, about 4 mm. long. North- 

 ern Wyoming to California and Washington. 





