ORAMINEa:. 



441 URALEPSIS, 



bent awn from near the base, the other with a straight awn from the back 

 near the summit. An early-flowering, deliciously fragrant grass. Introduc- 

 ed. May, June. 



Tribe 6. AVENEiE. 



Inflorescence paniculate. Spikelets solitary, feiv-flowered. Glumes and paletB of similar texture. 



Upper flowers generally pedicellate, with awn-like processes or abortive rudiments between tha 



upper and the lower ones. Upper palea with 2 keels. 



25. AI'RA. 

 Spikelets 2-flovverecl, without abortive rudiments; glumes 

 2, membranaceous and shining, subequal; one of the flowers 

 pedicellate; paleaj subequal, pilose at base, the lower one 

 lacerate at apex and awned on the back. 



1. A. FLEXUO'SA. 



Stem smooth, 1 — 2 feet high, nearly naked ; leaves setaceous, smooth, with 

 striate sheaths and truncate stipules; panicle loose, spreading, trichotomous, 

 with long, flexuous branches; aiotis geniculate, longer than the palete. Vales 

 and hills. Saddle Mt., Ms. An erect, elegant grass, growing in tufts. Jn. 



2. A. CjESPito'sa. 



Caespitose, glabrous ; stein 18 — 30 inches high ; leaves narrow-linear, scab- 

 rous above, smooth beneath, flat; panicle pyramidal, capillary, oblong, finally 

 diff'use; aw?is straight, about as long as the paleae which are longer than the 

 bluish glumes. Swamps. May. 



26. TRISE'TUM. 



Spikelet 2 — 5-flowered ; glumes 2, as long as the flowers ; 

 lower palea with 2 bristles at the apex and a soft flexuous 

 awn from above the middle of the back; scales ovate; fruit 

 coated, furrowed. 



1. T. PALu'sTRE. Torr. Avena palustris. Mx. 

 S^sm erect, contracted at the nodes, slender, smooth, about 2 feet high; 



leaves lance-linear, about 3 inches long, roughish, on smooth, striate sheaths ; 

 panicle oblong, contracted, nodding, yellowish green ; spikelets 2 — 3-flowered, 

 middle flower abortive, upper one pedicellate, its lower palea ending in 2 

 setose teeth, and awned below the tip, lower one mostly awnless. Wet 

 meadows. May — July. 



2. T. purpura'scens. Torr. Avena striata. Mx.f 

 Stem leafy, 2 feet high ; leaves narrow-linear, keeled, 4 — 6 inches long and 



with the sheaths smooth ; panicle very simple, almost a raceme, few-flowered, 

 4 — 6 inches long; glumes 3-flowered, very unequal, entire ; spikelets lanceo- 

 late, terete, purple, smooth ; loicer palea 7-nerved, 2-cleft at the extremity; 

 awn geniculate. Mountain bogs. 



3. T. subspica'tum. Br. T. aroides. P. rfe B. Aira. L. 

 Stem a foot high; leaves narrow, 2 — 4 inches long; panicle contracted into 



a spike 2 inches long; aicn at length deflexed,longerthan the glume. Rocks 

 and mountains. Little Falls, N. Y. Gray. White Mts., N. H. Pickering. Jn. 



27. URALE'PSIS. 



Spikelets 2 — 3-flowered; glumes 2, shorter than the flow- 

 ers; flowers stipitate and distinct; paleas 2, very unequal, 

 distinctly villous on the margins, the lower one tricuspidate, 

 the central cusp setose ; upper palea concave on the back ; 

 fruit gibbous, coated. • 



