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..............----------- 222 e eee ee eee 1. H. murinum. 
Plants not glaucous. 
Glumes 8 to 6 cm. long............-..----------+---------- 2. H. jubatum. 
Glumes 1 to 2 cm. long. 
Awns spreading; spikes yellowish.................-..-- 3. H. caespitosum. 
Awns erect; spikes reddish or brownish green........... 4. H. nodosum. 
1. Hordeum murinum L. Sp. Pl. 85. 1753. WALL BARLEY. 
Type Locauiry: ‘‘Habitat in Europae locis ruderatis.”’ 
Ranae: 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 Locatity: ‘‘Habitat in Canada.”’ 
Rance: 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; Mora; 
Pescado Spring; Santa Fe; Kingston; White Mountains. Plains and meadows, in 
the Upper Sonoran and Transition zones. 
Often a troublesome weed in cultivated ground. 
8. Hordeum caespitosum Scribn. in Pammel, Proc. Davenport Acaa. 7: 245. 1899, 
Type LOCALITY: Edgemont, South Dakota. 
Rance: 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 Locauity: ‘‘Habitat in Italia, Anglia.” 
Rance: 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 Raf. 
Cespitose perennials with mostly flat leaves ‘and terminal bearded spikes; spike- 
lets usually 2, sometimes 3 or 1, at each joint of the rachis, 2 to several-flowered; 
glumes many-parted from near the base or merely bifid, or subulate and entire, awned; 
lemmas terminating in a single long awn, or trifid and 3-awned; palea as long as the 
lemma, entire, bidentate, or 2-awned. 
KEY TO THE SPECIES. 
Glumes bifid from about the middle, the lobes abruptly divergent. 
Sheaths long-villous............------------- 22 eee eee eee eee 1. S. molle. 
Sheaths not villous. 
Glumes 3 to 4.cm. long..........----.-.---.----++++--+--- 2. S. caespitosum, 
Glumes 2 to 3 cm. long..........--.----------2++++-++--- 3. S. rigidum. 
Glumes entire, subulate-setaceous. 
Culm leaves long and flexuous........---.---------2+--++-+-- 4. S.longifolium. 
Culm leaves short, rigid, spreading. 
Lemmas 10 mm. long, glaucous......-..-....--------++-: 5. S. brevifolium. 
Lemmas 7 mm. long, soft-pubescent.............-.----+-- 6. S. pubsflorum. 
