620 CLXI. GRAMINEZ. ELyMus. 
53. HORDEUM. - 
Spikelets 3 at each joint of the rachis, 1-flowered, the lateral ones 
sometimes abortive ; glumes 2, subulate, nearly equal, awned ; paleze 
2, lower lance-ovate, long-awned, upper obtusely acuminate; caryop- 
sis adhering to the pale. 
1. H. vunGare. Barley. 
St. smooth, 2—3f high; lwvs. lance-linear, carinate, nearly smooth; sheaths 
auriculate at the throat; spike thick, about 3’ long; spikelets all fertile, 1-flower- 
ed, with an awn-like rudiment at the base of the upper palea ; glwmes collateral, 
May 6 than the flowers; fr. arranged in 4 rows,—@) Extensively ultivated. 
May. 
2. H. pisticnum. Two-rewed Barley. , 
St. 2—3f high; lvs. lance-linear, scabrous above; sheaths auriculate at 
the throat; spike 3—4’ long, linear, compressed ; lateral spikelets abortive, awn- 
_ less; fr. arranged in 2 row8.—@ More common, and is generally preferred for 
malting to the former species. June. § 
3. H. susitum. Squirrel-tail Grass. 
St. slender, round, smooth, simple, about 2f high ; lwvs. 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 palee produced into fine, 
smooth awns, 6 times as long as the flowers; abortive flowers on short pedicels.— 
@ Marshes, N. Eng. to Mo., N. to Subarc. Am. June. 
4. H. pustttum. Nutt. 
St. 4—6’ high, decumbent or geniculate at the base; /vs. about 14/ long, 
rather obtuse, glaucous, striate ; upper sheath tumid, embracing the spike ; spike 
linear, about 13’ long; glwmes by 3s, collateral, imbricated, lateral; abortive fls. 
awnless ; awn of the central sessile, § as long as those of the involucre ; elwmes 
all awned, the inner setaceous from the base; awns 1/ or more long.—Ohio ! to 
Ill. and Mo. 
54. LOLIUM. 
Celtic Joloa ; 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- 
leze herbaceous, subequal, lower one short-awned or mucronate, upper 
bifid-toothed. 
1. L. perENNE. Darnel Grass. 
Smooth ; st. terete, 1—2f high; /vs. lance-linear, shining-green, on striate 
sheaths with truncate stipules; rachis flexuous, grooved, 5—6’ long; spikelets 
about 16, longer than the glumes, 7—9-flowered, alternate, in two opposite 
rows; lower palea 5-veined, upper with 2, prominent, rough keels— 2 Natu- 
ralized in meadows, cultivated grounds, &c. May, June. 
2. L. TEMULENTUM. Poisonous Darnel. 
St. terete, smooth, 2f high; dvs. lance-linear, rough-edged, and with the 
sheatns, 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. ELYMUS. 
Gr. ev, 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 ; paleze lanceolate, lower one 
entire, mucronate or awned; scales ciliate. 
1, E, Vircinicus. Lime Grass. Wild Rye. 
St. erect, smooth, 3—4f high ; lwvs. lance-linear, flat, scabrous, deep green 
3’ broad; sheaths veined; stip. very short; spike erect, thick, 3—5’ long; spike- 
