552 GRAMINE^E. (GRASS FAMILY.) 



6. A. araclinoid.es, Ell. Culms and leaves very slender; panicle con- 

 tracted, weak and drooping ; glumes nearly equal, lanceolate, rough on the keel 

 and margins; upper palea minute, the lower with two minute bristles at the 

 truncated apex, and a long and very fine awn on the back above the middle. 

 Near Orangeburg, South Carolina, Elliott, and westward. April and May. Ij. 

 Culms 1 high. 



8. POLYPOGON, Desf. BEARD-GRASS. 



Flat-leaved chiefly annual grasses, with the 1-flowered spikelets stalked, and 

 crowded in close clusters into a terminal spiked panicle. Glumes 2, equal, awned, 

 and much longer than the palese, of which the lower one is truncated and toothed 

 at the apex, and often short-awned. Stamens 3. Stigmas 2. Grain elliptical, 

 free. 



1. P. maritimus, Willd. Culms simple (6'- 8' high); glumes pubescent, 

 hispid on the keel, one third as long as the slender awns ; lower palea 4-toothed, 

 unawned. (Phleum pratense, Ell., Herb.) Sea-shore of North and South 

 Carolina. Introduced. 



9. CINNA, L. 



Tall perennial grasses, with broad leaves, bearing the 1-flowered compressed 

 spikelets in a large compound terminal panicle. Glumes unequal, lanceolate, 

 acute, the sharp keel hispid-serrulate. Palese 2, raised on a stalk, smooth, the 

 lower one short-awned on the back below the apex. Stamen 1. Grain linear- 

 oblong, free. 



1. C. arundinacea, L. Culms (2 -7 high) simple; leaves linear- 

 lanceolate (' wide) ; branches of the panicle in fours or fives, erect in fruit; 

 spikelets often purplish (2"-3" long). Shaded swamps, Georgia, and north- 

 ward. Panicle 6'- 15' long, rather dense. Var. PEXDULA, Gray. Culms and 

 branches of the drooping panicle more slender ; pedicels very rough ; spikelets 

 smaller ; glumes and paleae thinner. Mountains of North Carolina, Curtis. 



10. MUHLENBERGIA, Schreb. DROP-SEED GRASS. 



Spikelets 1-flowered. Glumes persistent, pointed or awned, equal, or the 

 lower one smaller. Paleae 2, sessile in the glumes, commonly hairy at the base, 

 deciduous with the enclosed grain ; the lower one 3-nerved and mucronate or 

 awned at the apex. Stamens 3. 



$ 1. MUHLENBERGIA PROPER. Spikdets commonly much crowded, in lat- 

 eral and terminal panicles, short-stalked: culms branching: leaves flat. 



1. M. Mexicana, Trin. Panicles oblong, dense ; glumes unequal, lance- 

 olate, ending in slender hispid awn-like points, the upper one as long as the 

 awnless palete. (Agrostis laterifloni, Michx.) Damp soil, North Carolina, and 

 northward. June and Julv. Culms ascending, much branched. 



2. M. Willdenovii, Trin. Culms sparingly branched, erect; panicles 

 linear ; spikelets scattered ; paleae twice as long as the nearly equal short-pointed 



