552 GRAMINEJE. (GRASS FAMILY.) 



6. A. araehnoides, Ell. Culms and leaves very slender; panicle con' 

 traded, 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. y. 

 — 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 paleag, 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, WiUd. 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. Paleaj 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. pendula, Gray. Culms and 

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

 smaller ; glumes and ))aleffi thinner. — Mountains of North Carolina, Cuiiis. 



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 tlie base, 

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

 awned at the apex. Stamens 3. 



§ 1. MUHLENBERGIA Proper. — Spikelets commonly much crowded, in lat- 

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



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 lateriflora, Michx.) — Damp soil. North Carolina, and 

 northward. June and July. — Culms ascending, much branched. 



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

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



