GKAMINE-E. (GKASS FAMILY.) 599 



capillary short brauclies flower-bearing from the middle ; glumes uearly equal, 

 oue third louger thau the floret. — Damp shaded ground. July - August. 



3. A. seabra, Willd. Culms l°-2° high; leaves 3' -6' loug; panicle 

 large and ujjeu, tlie long (3' - 6') straight capillary scabrous branches closely 

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



— Low ground, common. June - July. 



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

 smooth brauclies; glumes lanceolate, nearly equal, rough keeled ; flowering 

 glume .-ihort-awned below the middle; palet minute. — High mountains of 

 North Carolina, and nortliward. July. — Culms 1° high. 



§ 2. Aguostis proper. — Palet muni/est. 



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 oue rarely 

 short-awned. — Low ground. Introduced. 



Var. vulgaris, ihurber. (Red Top.) Panicle spreading, mostly pur- 

 ple lioule short truncate; leaves commonly wider. — With the preceding. 

 Introduced. 



6. A. araehnoides, 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 upi)er districts. April - May. 2/ — Culms 

 1° high. 



32. POLYPOGON, Desf. Beard Grass. 



Flat-leaved chiefly animal 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 

 tootlied at tlie 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, oue third as long as the slender awns; flower- 

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

 Introduced. 



33. CINNA, L. 



Tall perennial grasses, with broad leaves, hearing the 1-flowered coni]iressed 

 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. V wide : branches of the panicle in fours or fives, erect in fruit ; spike- 

 lets often purplish, 2i"-3" long. — Shaded swamps. July. — Panicle 6'- 15' 

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

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

 thinner. — Mountains of North Carolina ( Curtis). 



