82 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
New Mexico: Truchas Peak; El Rito Creek; Las Vegas Range; near the head of 
the Nambe. Meadows, in the Arctic-Alpine Zone. 
2. Deschampsia cespitosa (L.) Beauv. Ess. Agrost. 91, 160. 1812. 
Aira cespitosa L. Sp. Pl. 64. 1753. 
Tyre Locauity: ‘‘Habitat in Europae pratis cultis & fertilibus.”’ 
RanGE: Arctic America to California, Arizona, Illinois, and New Jersey; also in 
Europe and Asia. 
New Mexico: North of Ramah; Chama; Tunitcha Mountains; Harveys Upper 
Ranch; Rio Pueblo; Spirit Lake; Silver Spring Canyon. Meadows, Transition to 
Hudsonian Zone. 
41. TRISETUM Pers. [Fase oars. 
Cespitose perennials or rarely annuals, with flat leaves and dense, spikelike or 
narrow, loose panicles; spikelets 2-(rarely 3 to 5-)flowered; rachilla hairy or naked, 
jointed above the glumes and between the florets, produced beyond the upper flower 
as a usually hairy bristle; glumes 2, awnless, carinate, unequal, usually longer than 
the lemmas; lemmas subhyaline, carinate, cleft or 2-toothed at the apex, the teeth 
sometimes produced into slender awns, awned between or a little below the teeth; 
awns twisted and usually geniculate; palea narrow, 2-toothed; grain smooth, free. 
KEY TO THE SPECIES. 
Panicles slender, interrupted; plants slender..............-.---- 1. T. interruptum. 
Panicles dense and crowded, not interrupted; plants stout. 
Leaf blades and sheaths long-hairy; upper part of the stem 
densely pubescent. ...........-.020-e0- eee eee eeeeee es 3 L' spicatum. 
Leaf blades and sheaths glabrous or the lowest sheath short- 
pubescent with reflexed hairs; stems glabrous or 
slightly scabrous in the inflorescence........-..---.-- 2.- T. montanum., 
1. Trisetum interruptum Buckl. Proc. Acad. Phila. 1862: 100. 1863. 
TypE Locauity: Middle Texas. 
RANGE: Western Texas and southern New Mexico. 
New Mexico: Bishops Cap (Wooton). Upper Sonoran Zone, 
2. Trisetum montanum Vasey, Bull. Torrey Club 13: 118. 1886. 
TypE Locauity: Not stated. 
Rance: Wyoming to northern New Mexico. 
New Mexico: Winsors Ranch; Cowles; Rio Pueblo; mountains near Las Vegas; 
Eagle Creek. Meadows, in the Transition and Canadian zones. 
3. Trisetum spicatum (L.) Richt. Pl. Eur. 1: 59. 1890. 
Aira spicata L. Sp. Pl. 63. 1753. 
Aira subspicata L. Syst. Veg. ed. 10. 873. 1759. 
Trisetum subspicatum Beauv. Ess. Agrost. 88. 1812. 
Tyre Locauity: ‘‘Habitat in Lapponiae Alpibus.”’ 
RaneGE: Arctic America to California, New Mexico, and New Hampshire; also in 
Europe. 
New Mexico: Pecos Baldy; Truchas Peak; Jemez Mountains. Meadows, in the 
Arctic-Alpine Zone. 
42. BULBILIS Raf. Burrato arass. 
Creeping or stoloniferous perennial with narrow flat leaves and unlike staminate 
and pistillate flowers borne on the same or different plants; staminate spikelets 2 or 
3-flowered, sessile in 2 rows along the short one-sided spikes, the glumes obtuse, 
unequal, the lemmas larger, 3-nerved, the palea 2-nerved; stamens 3; pistillate 
spikelets 1-flowered, in nearly capitate one-sided spikes scarcely exserted from the 
a ee 
