WOOTON AND STANDLEY FLORA OF NEW MEXICO. 107 



the central spikelet into a naked bristle; glumes 2, narrowly lanceolate, subulate, 

 or setaceous, rigid, persistent; lemmas lanceolate, rounded on the back, obscurely 

 5-nerved above, usually awned; palea shorter than the lemma, 2-keeled; stamens 3; 

 styles very short, distinct; grain sulcate, adherent to the palea. 



KEY TO THE SPECIES. 



Plants glaucous throughout 1. 77. murinum. 



Plants not glaucous. 



Glumes 3 to 6 cm. long 2. 77. jubatum. 



Glumes 1 to 2 cm. long. 



Awns spreading; spikes yellowish 3. 77. caespitosum. 



Awns erect; spikes reddish or brownish green 4. 77. nodosum. 



1. Hordeum murinum L. Sp. PI. 85. 1753. Wall barley. 

 Type locality: "Habitat in Europae locis ruderatis." 



Range: Native of Europe, widely naturalized in the United States. 

 New Mexico: Mangas Springs; Mesilla Valley. 



2. Hordeum jubatum L. Sp. PL 85. 1753. Squirrel-tail grass. 

 Type locality: "Habitat in Canada." 



Range: Alaska and British America to California, New Mexico, and Missouri. 



New Mexico: Farmington; Carrizo Mountains; Tunitcha Mountains; Chama; 

 Raton; Sierra Grande; Magdalena Mountains; Pecos; Torrance; Rio Pueblo; Menu; 

 Pescado Spring; Santa Fe; Kingston; White Mountains. Plains and meadows, in 

 the Upper Sonoran and Transition zones. 



Often a troublesome weed in cultivated ground. 



3. Hordeum caespitosum Scribn. in Pammel, Proc. Davenport Acad. 7: 245. 1899. 

 Type locality: Edgemont, South Dakota. 



Range: Wyoming and South Dakota to northern New Mexico. 

 New Mexico: Farmington (Standley 6904). Dry hills and plains, in the Upper 

 Sonoran Zone. 



4. Hordeum nodosum L. Sp. PL ed. 2. 126. 1762. Meadow barley. 

 Type locality: "Habitat in Italia, Anglia." 



Range: Temperate North America, Asia, and Europe. 



New Mexico: Tunitcha Mountains; Chama; Ramah; Grants Station; El Rito 

 Creek; Rio Pueblo. Wet ground, in the Transition Zone. 



73. SITANION Rat. 



Cespitose perennials with mostly tlat haves and terminal bearded Bpike ; spike- 

 lets usually 2, sometimes 3 or I, at each j^int of the rachis, 2 I" Beveral-flowered; 

 glumes many-parted from near the base or merely bit id, or subulate and entire, awned; 

 lemmas terminating in a single long awn, or trifid and :; awned; palea as long as the 

 lemma, entire, bidentate, or 2-awned. 



KKY TO THE SPECIES. 



Glumes bifid from about the middle, the lobes abruptly divergent. 



Sheaths long-villous ' ■ s - >"" !l ''- 



Sheaths not villous. 



Glumes 3 to 4 cm. long 2. 8. cat spiloaum. 



Glumes 2 to 3 cm. Ion- 3. 8. rigidum. 



Glumes entire, subulate-setaceous. 



Culm leaves long and flexuous '• 8.Umgifolium. 



Culm leaves short, rigid, spreading. 



Lemmas It) mm. long, glaucous '• N '• ■'• ' ifolium. 



Lemmas 7 mm. long, soft-pubescenl ,; - 8. pwnflorum. 



