Ordeb 156 — GBAMIKB^. 801 



brakes and scarcely over Cower. Tho firm, jointed, hollow, straight and tall 

 ciilma are variously useful. 



47. LEPTU'RUS, Br. Spikelct 1 on each joint of the filiform rachis, 

 immersed in a cavity, 1 or 2-flowered ; glumes coriaceous, acute, the 

 lower often wanting; pales membranous, awnless, shorter, than the 

 glumes ; grain free. — Lvs. and spikes very narrow. 



Ii. panioullitus Nutt. Culm scarcely 1^ compressed ; lvs. short, rigid, sheathing 

 the base of the panicle ; pan. or nailed rachis incurved, acutely triangular, rigid, 

 bearing 6—10 compressed, subulate spilces on one side, each 1 — 2' long; spike- 

 lets remote, on one side the rachis ; glumes rigidly fixed, unequal, parallel ; palesB 

 2, the outer of the same texture as the glumes, inner membranaceous. — 111. (Mead), 

 Mo. (NuttaU). 



48. HOR'DEUffl, E. Barlbt. (The ancient Latin name.) Spike- 

 lets 3 at each joint of tho riicliia, l-f.owcrod, the lateral ones spmetimes 

 abortive ; glumes 2, subulate, nearly equal, awned ; palese 2, lower 

 lance-ovate, long-awned, upper obtusely acuminate ; caryopsis adhering 

 to the palete. 



1 H. viilgare L. Foue-eowed Baelet. Culm smooth, 2 — 3f; lvs. lance-lin- 

 ear, carinate, nearly smooth ; sheaths aurieulate at the throat ; spike thick, about 3' 

 long ; spikelets all fertile, 1-flowered, with an awn-like rudiment at the base of 

 the upper palea ; glumes collateral, shorter than the flowers ; fr. arramged in 4, 

 rows. — 11 Extensively cultivated. May. 



2 H. distiolmm L. Two-rowed Barley. Culm 2 — 3f ; lvs. lance-linear, 

 scabrous above ; sheaths aurieulate at the throat ; spike 3 — 4' long, linear, com- 

 pressed ; lateral spikelets abortive, awnless ; fr. arranged in 2 rows. — ,'J) More 

 common, and is generally preferred for malting to the former species. June. 



3 H. jubatum L. Sqbieeel-tail Grass. Culm slender, round, smooth, simple, 

 about 2f; lvs. broad-linear, 4 — 6' long, rough-edged, otherwise smooth, as well 

 as the sheaths; spikes 2 — 3' long spikelets with the lateral flowers neuter; 

 glumes and paleas produced into fine, smooth awns, 6 times as long (2') as the 

 flowers; abortive flowers on short pedicels. — ©Marshes, N. Eng. to Mo., N. to 

 Subarc. Am. June. 



4 H. pusiUum Nutt. Culm 4 — G', decumbent or geniculate at the base; lvs. 

 about IJ' long, rather obtuse, glaucous, striate; upper sheath tumid, embracing 

 the spike ; spike linear, about 1 J' loug ; glumes by 3s, collateral, imbricated, 

 lateral ; aijortive fls. awnless ; awn of the central sessile 5 , as long as those of the 

 involucre, twice the length {1") of the pales, glumes all awned, the inner setaceous 

 from the base. — Ohio to 111. and Mo. 



49. EL'YMUS L. Lyme Geass. "Wild Eye. (Gr. eXvu, to en- 

 velop ; as' the spike in tho sheath.) Spikelets 2 to 4 at each joint of 

 the rachis, 2 to 6-flowered ; glumes 2, subequal, subulate, both placed 

 on the outer side of their spikelct forming an involucre to the group, 

 sometimes minute or obsolete ; pales lanceolate, coriaceous, the lower 

 mostly awned. 



§ Eltmus proper. InvoIucrG present, consisting of the conspicuons glumes (a) 

 a Spikelets 1 to 5-flawerecl, hard, rough, with conspicuous awns, (b) 



b Spilcelets glabrous, merely rough, 2 or S-flowereil Nos. 1, 2 



b Spikelets llispid with hairs, 1 to 8, or 2 to 5-iiowered Nos. 8, 4 



a Spikelets 5 to 8-flowered. .soft-pubescent, without awns No. 5 



§ Gymnostaohum. Invol. obsolete or the gls. minute. Awns divaricate.. No. '6 



1 E. Virgiuious L. Cuhn smooth, 3 or 4f; erect ; lvs. lance-linear, flat, scabrous, 

 deep green, 4" broad ; sheaths striate ; lig. very short ; spike erect, thick, 3 to 5' 

 long ; spikelets in pairs; 2 or 3-flowered, the collateral glumes in front, thickened 

 and subconnate at base, striate, and with the pales, produced into rather short (6 

 to 10"), scabrous awns. — U Banks of streams, IT. S. A Southern variety has 

 the glumes very thick and arcuate at base (like E. Gaput-Medusae L.). Aug. 



51 



