620 CLXl. GRAMINE^. Elymus. 



53. HORDEUM. 

 Spikelets 3 at each joint of the rachis, 1 -flowered, the lateral ones 

 sometimes abortive ; glumes 2, subulate, nearly equal, awned ; palete 

 2, lower lance-ovate, long-awned, upper obtusely acuminate ; caryop- 

 sis adhering to the paleae. 



1. H. vuLGARE. Barley. 



St. smooth, 2 — 3f high ; Ivs. lance-linear, carinate, nearly smooth ; sheaths 

 auriculate at the throat ; spike thick, about 3' long ; spikelets all fertile, l-flower- 

 ed, with an awn-like rudiment at the base of the upper palea ; ^Zmwcs collateral, 

 shorter than the flowers j //•. arranged in 4 rows. — (D Extensively ultivated. 

 May. ^ 



2. H. DisTiCHUM. Two-rov^ed Barley. 



St. 2 — 3f high ; Ivs. lance-linear, scabrous above ; sheaths auriculate at 

 the throat ; spike ^—4' long, linear, compressed ; lateral spikelets abortive, awn- 

 less ; fr. arranged in 2 rows. — (I) More common, and is generally preferred for 

 malting to the former species. June. ^ 



3. H. JUBATUM. Squirrcl-tail Grass. 



St. slender, round, smooth, simple, about 2f high ; Ivs. 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 palees produced into fine, 

 smooth awns, 6 times as long as the flowers; abortive jioivers on short pedicels. — 

 ^ Marshes, N. Eng. to Mo., N. to Subarc, Am. June. 



4. H. PUSILLUM, Nutt. 



St. 4 — 6' high, decumbent or geniculate at the base ; Ivs. about 1|' long, 

 rather obtuse, glaucous, striate ; upper sheath tumid, embracing the spike ; spike 

 linear, about IJ' long; glumes by 3s, collateral, imbricated, lateral; abortive /s. 

 awnless ; awn of the central sessile, ^ as long as those of the involucre ; glumes 

 all awned, the inner setaceous from the base ; awns V or more long. — Ohio ! to 

 111. and Mo. 



54. LOLIUM. 



Celtic loloa; a name applied to one of the species. 



Spikelets many-flowered, sessile, remote, with the edge to the ra- 

 chis ; glume to the lower spikelet single, to the terminal one 2 ; pa- 

 lese herbaceous, subequal, lower one short-awned or mucronate, upper 

 bifid-toothed. 



1. L. PERENNE. Darnel Grass. 



Smooth ; st. terete, 1 — 2f high ; Ivs. lance-linear, shining-green, on striate 

 sheaths with truncate stipules; rachis flexuous, grooved, 5 — & long; spikelets 

 about 16, longer than the glumes, 7 — 9-liowered, alternate, in two opposite 

 rows ; loiver palea 5- veined, upper with 2, prominent, rough keels. — % Natu- 

 ralized in meadows, cultivated grounds, &c. May, June. 



2. L. TEMULENTUM. Poisouous Darnel. 



St. terete, smooth, 2f high ; Ivs. lance-linear, rongfh-edged, and with the 

 sheaths, smooth on the surface ; stip. truncate ; rachis flexuous, 4 — 6' long ; 

 spikelets much compressed, 5 — 7-flowered, longer than the glumes ; lower palea 

 5-veined, produced into an awn twice its length. — Remarkably distinguished 

 from all other grasses by its poisonous seeds. N. Eng. to Penn. July. 



55. E L Y M U S. 



Gr. eXuft), to fold up ; the spike is enveloped in the sheaths in some of the species. 



Spikelets 2 or more at each joint of the rachis, 2 — 6-flowered ; 

 glumes 2, collateral, subequal, subulate ; paleae lanceolate, lower one 

 entire, mucronate or awned ; scales ciliate. 



1. E, ViRGiNicus. Lime Grass. Wild Rye. 



St. erect, smooth, 3 — 4rhigh ; lis. lance-linear, flat, scabrous, deep green, 

 I' broad; sheaths veined; stip. very .short; spike erect, thick, 3—5' long; spike- 



