Ordeb 156.— GRAMINEJ3. 803 



joints ; from creeping rhizomes, 1 to 2f ; lvs. 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; axons short or none; glumes 

 lanceolate, 5-veined, acuminate. — 1( A vilo weed, in lields 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; lvs. 



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.g 



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 a very loiif awn, 

 upper often bifid at apex ; scales abortive, hairy. 



S. Cereale L. Culm hairy beneath the spike, 4 — 6f; lvs. lance-linear, rough- 

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

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

 erect. — (£ or © The native country of this highly valuable grain is unknown. 

 It has long been cultivated. Jn., Jl. 



53. LEPTOCH'LOA, Beany. (Gr. Xenroc, slender, %Aoa, grass.) 

 Spikelets 2 to co-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.) 



§ Spikelets sessile, few-flowered, lower p.iUs entire at the acutish apex Nos. 1, 2 



5 Spikelets pedicellate, 6 to 9-flu\vered, lower pale notched and mucronate at eud No.' H 



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

 ing ; sheaths hairy, loose ; lvs. 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 the imtcronale-pointed glumes. — (T> Fields, S. States, common. Jl. — Oct. 



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

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

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

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

 the merely acute glumes; fls. obtuse. — Qj? Fields, S. States. (Oxydenia attena- 

 ata Xutt.) 



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

 4f; lvs. long and broad (If by 9", more or less); pan. dense, oblong, 9 to 15', 

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

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

 mucronate-awned in the notch at the apex. — Marshy soils, N. Y. to La., W. to 

 I1L (Festuca, Lam. F. multiflora Walt. F. polystaehia Mx.) 



^ 54. GYMNOPCVGON, Beanv. (Gr. yvfivfy naked, irwywv, 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. racemesum Beam-. Culm ascending 18 to 24', with short internodes; 

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

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

 rigid, flowerin g near their xchole lengtft, soon spreading or reflexed, 3 to 5' long; 



