GLYCERIA. CLXI. GRAMINE.E. 613 



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

 longer. 'Zj. Ohio, W. S. SuUivant ! 

 /?. 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 ; slip. 

 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 ; pokes equal, awnless, obtuse, 

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



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 clustefed racemes, on short, suberect 

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

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

 /3. major. Lvs. 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 ; panicle very slender, loose, 4 8' long ; spikekts about 3- 

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

 veined ; paleac awnless. 7|_ Rocky woods, N. England (rare) to Ky. ! 111. 

 May, June. 



5. K. PANICULATA. Nutt. 



St. tall (2 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. 1\. Michigan. Also Florida. 



39. TRICCJSPIS. 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, tricuspidate 

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

 most emarginate ; caryopsis 2-horned. 



T. sESLERiolDEs. 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.Q; 

 panicle loose, expanding, branches flexuous, smooth, long; spikekts ovate- 

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

 palea with 3 projecting veins. % A splendid grass in sandy fields, N. Eng. to 

 m. and S. States. 



40. GLYCERIA. Brown. 



Gr. yXuACDf, 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 ; panicle secund, long, slender, slightly branched ; spikekts 1 1 $' 

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

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



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



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

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

 ered ; As. very slender, acute, indistinctly veined. 7|. Inundated meadows, JN". 

 Eng., N. Y. June. 



