GLTCERIA. CLXI. GRAMINE^E. 613 



an abortive pedicel ; glume linear-oblong, acute, serrulate on the keel, upper one 

 longer. Tj. Ohio, W. S. SiMivant ! 

 0. Nuttalii. St. 8' high. Mich. 



2. K. OBTUSATA. Torr. (Aira obtusata. Michx. ?) 



St. erect, geniculate below, leafy, 18 24' high ; nodes pubescent, blackish, 

 contracted ; Ivs. 3 6' by 2", scabrous, acuminate, shorter than the sheaths ; stip. 

 lacerate ; panicle contracted, 3 5' long, 6 12" diam., dense, branches fascicled, 

 short, appressed; spikelets 1|" long, 2-flowered, tumid; lower glume linear-ob- 

 long, upper larger, obovate, obtuse, puberulent ; palece equal, awnless, obtuse, 

 scarious at summit, a little exserted. Tj. Ohio, Sullivant ! 



3. K. TRUNCATA. Torr. (Aira truncata. Muhl. Holcus striatus. Linn.') 

 St. slender, 2f high ; Ivs. smooth, narrow, 4 6' long ; panicle oblong, 



loose, racemose ; spikelets 2-flowered, in clustered racemes, on short, suberect^ 

 branches ; glumes subequal, the lower one linear, upper one much broader, very 

 obtuse or truncate ; pak<z awnless. Tj. Fields and open woods, Can. to Ky. Jn 

 B. major. Las. broad-linear, very long; panicle large, spreading. 



4. K. PENNSYLVANIA. DC. (Aira mollis. Muhl.} * " 



St. smooth, 2 3f high ; nodes black ; Ivs. 1 2' long, narrow, flat, lower 

 ones soft pubescent; panick very slender, loose, 4 8' long; spikelets about 3- 

 flowered, shining ; lower glume linear, upper one much broader, oblanceolate, 3- 

 veined ; pokes awnless. Tj. Rocky woods, N. England (rare) to Ky. ! 111. 

 May, June. 



5. K. PANICULATA. Nutt. 



St. tall (2 r 3f high) ; Ivs. elongated (4 6'), on long sheaths ; panicle ob- 

 long, glabrous ; spikelets 2 3-flowered, shining ; glumes awnless, very unequal, 

 the larger one truncately obtuse. % Michigan. Also Florida. 



39. TRICUSPIS. Palis. 



Lat. tres, three, cuspis, a point ; alluding to the structure of the flowers. 



Spikelets terete, tumid, about 5-flowered ; glumes 2, unequal, cari 

 nate, shorter than the flowers ; lower palea bifid-toothed, tricuspidat* 

 by the projecting keel and two lateral veins, upper one truncate, al 

 most emarginate ; caryopsis 2-horned. 



T. sF.sLERiolDEs. Torr. (Poa. Michx. Winsoria poaeformis. Nutt.) 

 False Red-top. St. very hard and smooth, erect, 4 5f high ; Ivs. smooth 

 beneath, lance-linear, veined, 12 18' long ; lower sheaths often hairy ; stip. ; 

 panick loose, expanding, branches flexuous, smooth, long; spikelets ovate- 

 lanceolate, purple, shining, 4 5-flowered ; glumes unequal, mucronate ; lower 

 paka with 3 projecting veins. 7{. A splendid grass in sandy fields, N. Eng. to 

 111. and S. States. 



40. GLYCERIA. Brown. 



Gr. y\VKvs, sweet ; on account of the sweet taste of the seeds. 



Spikelets slender, many-flowered; glumes 2, unequal, veinless, 

 truncate, shorter than the flowers ; lower palea herbaceous, embrac- 

 ing the upper, bidentate one ; scales connate, truncate. 



1. G. FLUITANS. Brown. (Festuca fluitans. Linn.) 



St. compressed or ancipitous, ascending at base, 3 5f high; Ivs. lance- 

 linear, smooth beneath, about a foot long ; sheaths veined, smooth, with a very 

 large stipule ; panick secund, long, slender, slightly branched ; spikekts 1 1 \' 

 long, linear, appressed, about 10-flowered; fls. obtuse; lower paka 7- veined, den- 

 ticulate. 1\. Aquatic. N. and N. W. States. June, July. 



2. G. ACUTIFLORA. Torr. (Festuca brevifolia. MM.) 



St. somewhat compressed, 1 2f high ; Ivs. narrow, attenuated above, half 

 as long as the stem ; panicle simple, long, appressed ; spikekts linear, 4 6-flow- 

 ered ; fls. very slender, acute, indistinctlv veined. 71 Inundated meadows, N. 

 Eng,, N. Y. June. 



