62 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
New Mexico: Trout Spring; Pecos Baldy. Meadows, in the Hudsonian and 
Arctic-Alpine zones. 
23. LYCURUS H.B. K. 
Cespitose erect perennial with narrow or convolute leaves and densely flowered 
cylindrical spikelike terminal panicles; spikelets 1-flowered, usually in pairs; glumes 
nerved, the nerves often produced into awns; lemma 3-nerved, awned, broader and 
longer than the glumes; palea 2-nerved, 2-keeled; stamens 3 ; Styles short, distinct; 
grain included within the glumes, free. 
1. Lycurus phleoides H. B. K. Nov. Gen. & Sp. 1: 141. pl. 45. 1816. 
TEXAS TIMOTHY. 
TyPE Locauity: “Crescit in temperatis Mexici, inter Guanazuato et Temescatio 
et in radicibus aridissimi montis La Buffa, alt. 1030 hexap.”’ 
Rance: Western Texas and southern Arizona to Mexico. 
New Mexico: Abundant from the Mogollon Mountains and Santa Fe and Las 
Vegas mountains southward and eastward across the State. Dry hills, in the Lower 
and Upper Sonoran zones. 
Texas timothy is abundant on the dry hills of the southern part of the State. Itis 
less common in the north. It grows in bunches and is a rather important range grass 
in some sections. 
24. ARISTIDA L. Neep.ie arass. 
Tufted annuals or perennials with narrow leaves; spikelets 1-flowered, on long or 
short slender pedicels, in more or less expanded terminal panicles; rachilla articulated 
above the glumes and produced into a hard obconical hairy callus below the lemma 
but not extending beyond it; glumes more or less unequal, acute or bristle-pointed, 
slightly keeled; lemma somewhat firmer in texture, closely rolled around the floret 
and the usually short palea, terminating in a usually trifid awn; grain slender, tightly 
inclosed in the hardened lemma but free from it. 
KEY TO THE SPECIES. 
Annual...... 2222.02.02 eee eee eee eee cece ccc ceceecee. 1, A. bromoides. 
Perennials. 
Plants widely divaricate-branched, the branches of the panicle 
rigid and straight. 
Awns 3, all of about the same length..................... 2. A. divaricata. 
Awns apparently 1, the lateral ones short or obsolete... ... 3. A. schiediana. 
Plants with erect or at most rather weakly spreading stems. 
Glumes nearly equal. 
Plants stout and strict, 30 cm. high or more ; pedicels 
short, straight; glumes conspicuously awned.... 4. A. arizonica. 
Plants slender, 20 cm. high or less, rather spreading; 
pedicels slender, sinuous; glumes acuminate, 
not awhed......... 2.0... cece cece eee eee 5. A. havardii. 
Glumes very unequal, the first usually about half as long 
as the second. 
Mature lemma not tapering upward, the neck of about 
the same diameter as the base; second glume 
considerably longer than the lemma, the latter 
smooth; awns 6 to 8 cm. long................... 6. A. longiseta. 
Mature lemmas tapering upward into a slender neck ; 
second glume barely surpassing the lemma, 
usually shorter, the lemmas usually scabrous; 
awns usually much less than 6 cm. long. 
