80 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Calamagrostis canadensis (Michx.) Beauv. Ess. Agrost. 15. 1812. 

 Arundo canadensis Michx. Fl. Bor. Amer. 1: 73. 1803. 



Type locality: Canada. 



Range: British America to Oregon, New Mexico, Ohio, and New Jersey. 

 New Mexico: Ponchuelo Creek; Winsor Creek. Wet ground, in the Transition 

 and Canadian zones. 



2. Calamagrostis hyperborea americana Vasey; Kearney, U. S. Dept. Agr. Div. 



Agrost. Bull. 11:41. 1898. 

 Deyeuxia neglecta americana Vasey; Macoun, Cat. Can. PI. 4: 206. 1888. 

 Type locality: Donald, Columbia Valley, British Columbia. 

 Range: British America to Oregon, New Mexico, and Vermont. 

 New Mexico: Tunitcha Mountains; Harveys Upper Ranch. Damp woods, in the 

 Canadian Zone. 



37. CALAMOVILFA Scribn. Sand grass. 



Rather tall rigid perennials with loosely spreading panicles; spikelets 1-flowered; 

 rachilla jointed above the glumes but not prolonged beyond the floret, the callus 

 densely bearded; glumes laterally compressed, keeled, chartaceous, awnless, unequal, 

 acute; lemma 1-nerved, acute; stamens 3; styles distinct. 



KEY TO THE SPECIES. 



Panicle branches erect; spikelets about 6 mm. long 1. C. longifolia. 



Panicle branches spreading; spikelets 8 mm. long 2. C. gigantea. 



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

 Calamagrostis longifolia Hook. Fl. Bor. Amer. 2: 241. 1840. 

 Type locality: "Saskatchawan." 



Range: British America to New Mexico and Indiana. 



New Mexico: Near Texline (Griffiths 5650). Plains, in the Upper Sonoran Zone. 



2. Calamovilfa gigantea (Nutt.) Scribn. & Men. U. S. Dept. Agr. Div. Agrost. 



Circ. 35: 2. 1901. 

 Calamagrostis gigantea Nutt. Trans. Amer. Phil. Soc. n. ser. 5: 143. 1837. 

 Type locality: "On the sandy banks of Great Salt river of the Arkansas." 

 Range: Sandy soil, Kansas to Arizona. 

 New Mexico: A single specimen seen, without definite locality. 



38. DANTHONIA DC. Wild oat grass. 



Low cespitose perennials with simple, spreading or narrow panicles; spikelets several- 

 flowered, the uppermost flower imperfect or rudimentary; rachilla jointed above the 

 glumes; glumes 2, much exceeding the lemmas, these rounded on the back, 2-toothed 

 or bifid, awned between the teeth, the awn formed by an extension of the 3 middle 

 nerves of the lemma. 



KEY TO THE SPECIES. 



Lemmas pubescent only on the margin and at the base 1. D. intermedia. 



Lemmas pubescent on the back as well as on the margin. 



Glumes 15 to 20 mm. long 2. D. parryi. 



Glumes 10 mm. long or less 3. D. spicata. 



1. Danthonia intermedia Vasey, Bull. Torrey Club 10: 52. 1883. 



Type locality: "California, Rocky Mountains, Plains of British America to Mount 

 Albert, Lower Canada." 



Range: British America to California and New Mexico. 



