560 graminejE. (grass family.) 



than tlio !iwn-|)ointed teeth. (Uralepis cornuta. Ell.) — Dry sandy soil, Florida 

 to North Carolina. Aug. and Sept. 11. 



2. T. purpurea. Culms procumbent or ascending, l°-l^°long; leaves 

 and sheaths smooth or rougliish ; lateral panicles included ; awn of the lower 

 palca bearded, about as long as the obtuse teeth, and much shorter than the 

 palese. (Aira, Ell. Uralepis purpurea, Nutt.) — Drifting sands along the coast, 

 Florida, and northward. Aug. -Oct. — Leaves 1'- 4' long. Spikelets bright 

 purple. 



26. EATONIA, Raf 



Slender erect and tufted grasses, with narrow leaves, and small smooth (not 

 hairy) spikelets of pale flowers in a racemose or spicate panicle. Spikelets awn- 

 less, 2-5-flowered, the uppermost flower usually an awn-like pedicel. Glumes 

 membranaceous, shorter than the flowers ; the lower one linear and 1-nerved ; the 

 upper obovate, 3-nerved. Paleae unequal, the lower one obtuse. Stamens 3. 

 Grain linear-oblong. 



1. E. Obtusata, Gray. Panicle dense, S]rike-like, the 2-flowercd spikelets 

 much crowded on the short erect branches ; glumes rough on the back, the upper 

 one round-obovate, somewhat truncate, rather rigid ; lower palea lanceolate- 

 oblong, obtuse, rough-keeled. {Aira obtusata, Michx.) — Dry soil, Florida, and 

 northward. April and May. 1). and — Culms 1 ° - 2° high. 



2. E. Pennsylvanica, Gray. Panicle slender, loo^e, the 2-3-flowered 

 spikelets scattered on the slender branches ; glumes slightly roughened on the 

 back, the upper one obovate, obtuse, or abruptly short-pointed ; lower palea ob- 

 tuse ; leaves flat, with the sheaths smooth, rough, or soft-downy. (Aira mollis. 

 Ell.) — Upper districts. April. 1). — Culms l°-2° high. 



Var. ? flliformis. Culms 1° high, very slender, barely longer than the fili- 

 fonn involute leaves ; panicle linear, loose ; spikelets scattered, mostly 3-flowered, 

 the flowers distant on the rachis, the lowest one and glumes nearly smooth. (Aira 

 mollis, var. Ell.) — Dry pine barrens, Florida to South Carolina. March. 



27. MELICA, L. 



Perennial grasses, with flat leaves, and 3 - 5-flowered spikelets of large flowers 

 in a simple panicle. Flowers awnless, the upper ones imperfect. Glumes mem- 

 branaceous, unequal, convex, obtuse, scarious on the margins, many-nerved. 

 Paleas similar to the glumes ; the upper one smaller, concave on the back. Sta- 

 mens 3. Grain free. 



1. M. mutica, Walt. Culms l°-2°high; leaves and sheaths smooth or 

 rough-pubescent ; panicle loose, of few nodding racemose spikelets ; upper flow- 

 ers imperfect, truncate-obovate ; palea roughish. (M. glabra, Michx.) — Dry 

 open woods, Florida, and northward. April. 



28. GLYCERIA, Brown. 



Smooth perennial marsh or water grasses, with flat leaves, nearly entire sheaths, 

 and terete or tumid many-flowered spikelets disposed in a simple or compound 



