WOOTON AND STANDLEY FLORA OF NEW MEXICO. 81 



New Mexico: Horsethief Canyon {Standley 4880). Meadows, in tlie Canadian 

 Zone. 



2. Danthonia parryi Scribn. Bot. Gaz. 21: 133. 1896. 

 Type locality: Colorado. 



Range: Colorado and New Mexico. 



New Mexico: Grass Mountain {Standley 4371). Meadows, in the Canadian Zone. 



3. Danthonia spicata (L.) Beauv.; Roem. & Schult. Syst. Veg. 2: 690. 1817. 

 Avena spicata L. Sp. PI. 80. 1753. 



Type locality: "Habitat in Pennsylvania." 



Range: British America to New Mexico, Louisiana, and North Carolina. 

 New Mexico: Harveys Upper Ranch; West Fork of the Gila. Damp woods, in the 

 Canadian Zone. 



39. AVENA L. Oats. 



Annuals or perennials with rather large si^ikelets variously paniculate; spikeleta 2 

 to 6-flowered; rachilla jointed above the glumes, bearded below the lemmas; glumes 

 2, unequal, membranaceous, longer than the lemmas, these rounded on the back, 5 to 

 9-nerved, often bidentate at the apex, with a long dorsal twisted awn; grain pubes- 

 cent, at least at the apex, frequently adherent to the lemma or palea. 



KEY TO THE SPECIES. 



Glumes shorter than the lemmas; panicles lax, somewhat nodding; 



lemmaa hairy at the base 1. A. striata. 



Glumes longer than the lemmas; panicles open; lemmas often hairy up 



to the base of the awn 2 . A. fatua. 



1. Avena striata Michx. Fl. Bor. Amer. 1: 73. 1803. 



Type locality: "Hab. in sinn Hudsonis per tractus montium ad Canadam." 



Range : British America to New Mexico and Pennsylvania. 



New Mexico: Ponchuelo Creek (Standley 4185). Meadows, in the Canadian Zone. 



2. Avena fatua L. Sp. PI. 80. 1753. Wild oats. 

 Type locality: "Habitat in Europae agris inter segetes." 



Range: Native of Europe and Asia, widely introduced into the United States; 

 especially common in grain fields. 



New Mexico: Shiprock; Carrizo Mountains; Dulce; Cedar Hill; Cleveland; Taos; 

 Pecos; Mora. 



40. DESCHAMPSIA Beauv. 



Annuals or perennials with flat or convolute leaves and rather small shining spikelets 

 in terminal or lateral, narrow or loose panicles; spikelets mostly 2-flowered; rachilla 

 hairy, jointed above the glumes and prolonged beyond the upper floret as a hairy 

 bristle; glumes 2, thin and scarious, acute or obtuse, nearly equal; lemmas subhyaline, 

 4-nerved, truncate and more or less regularly 2 to 4-toothed, aAvned on the back, the 

 awn slender, twisted below; palea narrow, 2-nerved; grain oblong, free. 



KEY to the species. 



Plants low, 20 to 40 cm. high; glumes 4 mm. long; awns much longer 



than the lemmas 1 . D. alpicola. 



Plants tall, 60 to 100 cm.; glumes 3 to 3.5 mm. long; awns little if at 



all longer than the lemmas 2. D. caespitosa. 



1. Deschampsia alpicola Rydb. Bull. Torrey Club 32: 601. 1905. 

 Type locality: Mountain meadows, Pikes Peak, Colorado. 

 Range: Wyoming and Utah to northern New Mexico. 

 52576°— 1.5 6 



