GKAMINE.E. (GRASS FAMILY.) 590 



capillary short branches flower-bearing from the middle ; glumes nearly equal, 

 one third longer than the floret. Damp shaded ground. July - August. 



3. A. SCabra, Willd. Culms l-2 high; leaves 3' -6' long; panicle 

 large and open, the long (3' - 6') straight capillary scabrous branches closely 

 flower bearing at their summits ; glumes nearly equal, the keel scabrous. 



Low ground, common. June - July. 



4. A. cauina, L. Culms slender, erect ; panicle small, oblong, with erect 

 smooth branches; glumes lanceolate, nearly equal, rough- keeled; flowering 

 glume short-awued below the middle; palet minute. High mountains of 

 North Carolina, and northward. July. Culms 1 high. 



2. AGKOSTIS proper. Palet manifest. 



5. A. alba, L. (Fioriu). Culms ascending from creeping rootstocks; 

 leaves short, the ligule long, acute ; panicle expanded in flower, contracted in 

 fruit, mostly pale green ; lower glumes nearly equal, the flowering one rarely 

 short-awned. Low ground. Introduced. 



Var. vulgaris, ilmrber. (RED TOP.) Panicle spreading, mostly pur- 

 ple ; ligule short truncate ; leaves commonly wider. With the preceding. 

 Introduced. 



6. A. arachnoid 68, Ell. Culms and leaves very slender ; panicle con- 

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

 keel and margins ; pakt minute ; flowering glume with two minute bristles at 

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



Fields and open woods in the upper districts. April -May. 2/ Culms 

 1 high. 



32. POLYPOGOW, Desf. BEARD GRASS. 



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

 crowded in close clusters in a terminal spiked panicle. Glumes 5, equal, 

 awned, and much longer than the floret, the flowering glume 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 pubes- 

 cent, hispid on the keel, one third as long as the slender awns ; flower- 

 ing glume 4-toothed, unawned. Coast of North and South Carolina. 

 Introduced. 



33. 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. Floret raised on a stalk, smooth, its 

 glume 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-lan- 

 ceolate, \' wide ; branches of the panicle in fours or fives, erect in fruit ; spike- 

 lets often purplish, 2i" - 3" long. Shaded swamps. July. Panicle 6' - 1 5' 

 long, rather dense. Var. PENDTTLA, Gray. Culms and branches of the droop- 

 ing panicle more slender; pedicels very rough; spikelets smaller; glumes 

 thinner Mountains O f North Carolina (Curtis). 



