OBDBB 156. GRAMINE^E. 803 



joints ; from creeping rhizomes, 1 to 2f ; Ivs. lance-linear, rough above and some- 

 what hairy ; stip. short truncate ; spike compressed, about 3' in length ; spikelets 

 remote, alternate, lance-oblong, 5 6-flowered ; awns slwrt or none ; glumes 

 lanceolate, 5-veined, acuminate. U A vile weed, in nelds and gardens, extreme]} 

 difficult to eradicate. June Aug. 



3. DASYSTACHIUM. Glaucous, very smooth ; spikelets 5 to 9-flowered, whitish 



all over with downy hairs. Lake shores, Wis., Mich., Can. 



3 T. caninum R. & S. DOG'S COUCH GRASS. St. 2 3f, erect or oblique ; IVP. 

 flat, smooth ; stip. almost wanting ; spikelets about 5-flowered ; glumes 3-veined, 

 and with the outer palea, terminating in a straight, scabrous bristle, longer than 

 the flowers. Delaware (Muhlenberg) to Mich. 



52. SECA'LE, L. RYE. (Celtic segal, from sega, a sickle.) Spike- 

 lets solitary on the teeth of the rachis, 2 3-flowered, the 2 lower flow- 

 ers fertile, sessile, opposite, the upper one abortive ; glumes subulate, 

 opposite, shorter than the flowers ; lower palea with .1 very long awn, 

 upper often bifid at apex ; scales abortive, hairy. 



S. Cereals L. Culm hairy beneath the spike, 4 6f ; Ivs. lance-linear, rough- 

 edge, and rough above, glaucous; spike about 5' long, linear, compressed; paleaa 

 smooth, lower ciliate on the keel and margin ; awns scabrous-ciliate, long, straight, 

 erect. -Op or The native country of this highly valuable grain is unknown. 

 It has long been cultivated. Jn., Jl. 



53. LEPTOCH'LOA, Beauv. (Gr. ASTTTO^, slender, %Aoa, grass.) 

 Spikelets 2 to QO-flowered, subsessile, in one-sided spikes forming a pani- 

 cle raceme; glumes carinate, awnless; pales membranous, lower 3-veined, 

 carinate, awnless or awned ; stamens 3 ; stigmas simply plumous. 

 Lvs. flat and soft. Pan. composed of many slender spikes. (Oxydenia 

 Nutt.) 



S Spikelets sessile, few-flowered, lower pale entire at the .icntish apex Nos. 1, 2 



S Spikelets pedicellate, 6 to 9-flowered, lower pale notched and mncronate at end No. 3 



1 L. mucronata Kunth. Culm geniculate at the lower joints, 2 to 3f, ascend- 

 ing ; sheaths hairy, loose ; Ivs. lance-linear, tapering to a long acumination ; pan. 

 a foot or more long, the numerous spikes very slender, 2 to 4', flowering their 

 whole length; spikelets green, sessile, minute, 2 to 4-flowered, awnless, shorter 

 than Hie mucronate-pointed glumes. Q) Fields, S. States, common. Jl. Oct. 



2 L. filiforxnis R. & S. Culm geniculate below, upright 3 to 4f ; sheaths some 

 hairy; Ivs. lance-linear, rough-edged, twice larger (If by 9" or less) than in tho 

 last ; pan. near 2f long, the numerous spikes very slender, straight and suberect, 

 5 to 8' long ; spilcekts purple, sessile, minute, sub-3-flowered, a little exceeding 

 the merely acute glumes ; fls. obtuse. (X 1 ? Fields, S. States. (Oxydenia attenu- 

 ata Nutt.) 



3 L. fascicularis Gr. Glabrous, stout, ascending from a geniculate base 2 to 

 If; Ivs. long and broad (If by 9", more or less); pan. dense, oblong, 9 to 18', 

 with very many sessile, secund spikes 2 to 3' long ; spikelets short-pedicelod, 

 lance-oblong (3 to 4"), flat, about 9-flowered; lower pale oblong, ciliate below, 

 Tiiucronate-awned in the notch at the apex. Marshy soils, N. Y. to La., \V. to 

 111. (Festuca, Lam. F. multiflora Walt. F. polystachia MX.) 



54. GYMNOPCTGON, Beauv. (Gr. yvpvo?, naked, Trwywv, beard.) 

 Spikes setaceous, corymbously paniculate ; spikelets remote, 1 -flowered, 

 with a rudiment ; glumes 2-keeled, subequal, lance-linear ; lower pale 

 with a straight awn from a little below the tip ; rudiment aristiform. 

 Low, reed-like. (Anthopogon, Nutt.) 



1 G-. racemosum Beauv. Culm ascending 18 to 24', with short internodes; 

 Ivs. ovate-lanceolate, 1 to 2' by 4 to 8'', glabrous, flat, spreading, in 2 rows; 

 sheaths hairy at (he throat; lig. obsolete; pan. large, pyramidal, branches simple, 

 rigid, fiowiring near their whole length, soon spreading or reflexed, 3 to 5' long; 



