552 GRAMINEiE. (GRASS FAMILY.) 



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

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

 and margins ; upper palca 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° liigh. 



8. POLYPOGON", Dcsf. Beard-Gras.s. 



Flat-Icavcd chiefly annual grasses, with the 1-flowered spikelcts stalked, and 

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

 and much longer than the paleaj, of wiiich the lower one is truncated and tootiied 

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

 free. 



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

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

 unawncd. (Phlcum pratense, Ell., Herb) — Sca-siiore 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, la#t'eolatc, 

 acute, the sharp keel his[)id-scrrulate. Palea; 2, raised on a stalk, smooth, the 

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

 oblong, free. 



I. C. arvindinacea, L. Culms (2° -7° high) simple; leaves linear- 

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

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

 ward. — Panicle 6'- 1.5' long, rather dense. — Var. pendi;la. Gray. Culms and 

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

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



10. MUHLENBERGIA, Schrcb. Duop seed Grass. 



Spikelets l-flowered. Glumes j)crsistent, pointed or awned, equal, or the 

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

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

 awned at the apex. Stamens 3. 



^ 1. MUIILENBETJGIA PuorER. — Spiblrts ronmiouli/ much rrnmlrd, in hit- 

 end and terminal panicles, s/iort-slalkrd : culms hranchiiHj: Uanajhil. 



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

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

 awnless palem. (Agrostis lateriflora, Michr.) — Damp soil, North Carolina, and 

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



2. M. W"illdenovii, Trin. Culms sparingly brandicd, erect; pnnirlcn 

 linear; spikelets scattered ^^ pah tc twice as long as the nearly equal short-pomtcd 



