82 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



New Mexico: Truchas Peak; El Rito Creek; Laa Vegaa 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. PI. 64. 1753. 



Type locality: "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. False oats. 



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 3. T. spicatu m . 



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 locality: 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 locality: Not stated. 



Range: 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. PI. Eur. 1: 59. 1890. 

 Aira spicata L. Sp. PI. 63. 1753. 



Aira subspicata L. Syst. Veg. ed. 10. 873. 1759. 



Trisetum subspkatum Beauv. Ess. Agrost. 88. 1812. 



Type locality: "Habitat in Lapponiae Alpibus." 



Range: 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. Buffalo grass. 



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 



