122 GRAMINEAE 



26. CALAMAGROSTIS Adans. 



Spikelets 1-flowered, in narrow or open panicles. Glumes subequal, usually 

 longer than the floret. Rachilla prolonged behind the palea as a usually hairy 

 pedicel. Lemma with 2 pairs of lateral nerves, surrounded at the base with 

 tuft of hairs, awned from the back usually below the middle. Palea shorte 

 than the lemma, faintly 2-nerved. Usually tall or reed-like perennials. Species 

 about 120, distributed throughout the world in temperate and arctic regions. 

 (Greek calamos, a reed, and agrostis, a grass.) 

 Awn longer than the glume, and geniculate. 

 Panicle open, the branches spreading. 



Blades mostly basal, capillary 1. C. breweri. 



Blades scattered, broad and flat 2. C. bolanderi. 



Panicle compact. 



Glumes about 5 lines long, gradually long-acuminate 3. C. foliosa. 



Glumes 3 to 4 lines long, abruptly acute or acuminate 4. C. purpurascens. 



Awn shorter than the glumes, straight or somewhat genieulate. 

 Panicle loose, the branches spreading or ascending. 



Callus hairs copious, as long as lemma 5. C. canadensis. 



Callus hairs sparse, shorter than lemma. 



Glumes 1% to 2 lines long 6. C. calif ornica. 



Glumes 2 1 / to 3 lines long 7. C. aleutica. 



Panicle narrow, more or less spike-like. 



Sheaths pubescent on collar 8. C. rubescens. 



Sheaths glabrous on collar. 



Glumes ovate, firm or indurated, 2 lines long; awn straight 9. C. crassiglumis. 



Glumes lanceolate, thin. 



Glumes l l /2 lines long; awn straight 10. C. hyperborea. 



Glumes 2i/-> lines long; awn geniculate 11. C. densa. 



1. C. breweri Thurb. Culms slender, erect, cespitose, 6 to 12 inches high; 

 leaves mostly basal, usually involute-filiform ; panicle ovate, open, purple, 1 to 

 3 inches long, the lower branches slender, spreading, few-flowered, ^ to 1 

 inch long ; glumes 1% to 2 lines long, 1-nerved, smooth, acute ; lemma nearly 

 as long as glumes, cuspidate-toothed, the awn borne near the base, geniculate, 

 exserted, twisted below, about 1 line long above the bend; rudiment long- 

 pilose, 1 line long. 



Mountain meadows of the high Sierra Nevada. 



Locs. Webber Lake, Leiberg 5259; Donner Pass, Heller 7130; Mt. Tallac, Hitchcock 

 3146; Yosemite Nat. Park, Bolander 6098, Hall $ Babcock 3627, Hitchcock 3258, 3306, 3430, 

 Lemmon in 1897; Sequoia Nat. Park, Hitchcock 3470, Purpus 5210. 



Eefs. CALAMAGROSTIS BREWERI Thurb. in Wats. Bot. Cal. 2: 280. 1880, type from Carson 

 Pass, Brewer 2128. C. lemmoni Kearn. U. S. Dept. Agr. Div. Agrost. Bull. 11: 16. 1898, 

 type collected in California by Lemmon in 1875. 



2. C. bolanderi Thurb. Culms 3 to 4 feet tall ; sheaths scabrous ; blades flat, 

 scattered, nearly smooth ; panicle open, 4 to 8 inches long, the branches vertic- 

 illate, spreading, naked below, the longer 2 to 4 inches long; glumes I 1 /? to 

 2 lines long, purple, scabrous, acute ; lemma very scabrous, about as long as 

 glumes, the awn from near base, geniculate, exserted, about 1 line long above 

 the bend ; rudiment pilose, 1 line long. 



Bogs and moist ground, prairie or open woods, Mendocino and Humboldt 

 cos. near the coast. 



Locs. Humboldt Co., Kellogg $ Harford 1092; Mendocino, Davy $ Blasdale 6074, 6090, 

 Pringle; Pt. Arena, Davy $ Blasdale 6128; Noyo Eiver, Bolander 6471 in part, Davy $ 

 Blasdale 6574. 



Eefs. CALAMAGROSTIS BOLANDERI Thurb. in Wats. Bot. Cal. 2: 280. 1880, type Bolander 

 6471 in part. 





