GRAMINEJE. (GRASS FAMILY.) G27 



rootstocks ; the spikclets panicled. (Name from yXvKepos, sweet, in allusion to 

 the taste of the grain.) 



§ 1. GLYCERIA proper. Lower palet conspicuously nerved: styles present: 

 plumes of the stigma branched or toothed : grain grooved on the inner side : 

 leaves fiat, the sheaths nearly entire. 



* Sjiikelets ovate, oblong, or linear-oblong, l"-3" in length, 

 ■*- At length nodding in an open panicle, jiattish laterally but turgid. 



1. G. Canadensis, Trin. (Rattlesnake-Grass.) Panicle -oblong- 

 pyramidal, at length drooping ; sjiikelets ovate, at length very broad and tu- 

 mid, Briza-like, 2" long, pale, with purplish glumes ; lower palet acute or blunt- 

 pointed, firm, with not very prominent nerves, longer than the rounded upper 

 one; culm stout, 2° -3° high; leaves long, roughish. (Briza Canadensis, 

 Michx. — Bogs and wet places : common from Penn. northward. July. 



h- •<- Erect in a narrow contracted panicle, somewhat flattened and turgid. 



2. G. obtUSa, Trin. Panicle narrow) 'y oblong ; dense ; (3' -5' long); spike- 

 lets 6 - 7-flowered ; 2" -3' long; lower palet obtuse; culm stout, l°-2° high, 

 very leafy; leaves long, smooth. (Poa obtusa, Muhl.) — Bogs, E. New Eng- 

 land to Penn., near the coast. 



3. G. elongata, Trin. Panicle narrowly racemose, elongated (1° long), 

 recurving ; the branches and 3 - 4-flowcred spikelets oppressed ; lower palet ob- 

 tuse ; leaves very long (1° or more), rough. (Poa elongata, Torr.) — Wet 

 woods, New England to Michigan, and northward. July -Aug. 



-t- •*- +- Diffuse : lower palet truncate-obtuse, prominently 7 -nerved ; upper 2-toothed. 



4. G. nervata, Trin. (Fowl-Meadow Grass, in part.) Branches of 

 the loose panicle capillary, at length drooping, the very numerous small spikelets 

 ovate-oblong, 3 - 7-flowered ; leaves rather long. (Poa nervata, Willd. P. stri- 

 ata, Michx. P. parviflora, Pursh.) — Moist meadows : very common. June. 



— Culm erect, l°-3° high. Spikelets l"-2" long, commonly purplish. 



5. G. pallida, Trin. Branches of the rather simple panicle slender, erect- 

 spreading, rough ; the spikelets usually few, somewhat oppressed, oblong -linear, 5 - 9- 

 flowercd (pale, 2''-3" long) ; lower palet minutely 5 -toothed ; the upper lanceolate, 

 conspicuously 2-toothed ; leaves short, sharp-pointed, pale. (Windsbria pallida 

 & Poa dentata, Torr.) — Shallow water : common, especially northward. July. 



— Culms slender, l°-3° long, ascending from a creeping base. 



6. G. aquatica, Smith. (Reed Meadow-Grass.) Panicle much branched, 

 ample (8'- 15' long) ; the numerous branches ascending, spreading ivith age; spikelets 

 oblong or linear-oblong, 5-9-flowered (usually purplish, 2" -3" long) ; lower palet 

 entire ; leaves large (1° - 2° long, J' to ^' wide. — Wet grounds : common north- 

 ward. July. — Culm stout, upright, 3° -5° high. (Eu.) 



# * Spikelets linear (£'-1' long), pale, oppressed on the branches of the long and 

 narrow racemose panicle, terete except during anthesis : pahis minutely roughish, 

 the upper 2-toothed : squamuhe unilateixil or united : ligule long: culm flattened 

 ( 1 ° - 5° high ) , ascending from a rooting base. ( Glyceria, R. Br.) 



7. G. fluitans, R.Br. Spikelets 7 - 13-flowered ; lower palet oblong, obtuse, 

 or the scarious tip acutish, entire or obscurely 3-lobed, usually rather longer 



