620 CLXL GRAMINE^E. ELTMUS. 



53. HORDEUM. 



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

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

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

 sis adhering to the palese. 



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, 1-flower- 

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

 shorter than the flowers ; fr. arranged in 4 rows. (J) Extensively ultivated. 

 May. 



2. H. DISTICHUM. Two-rowed Barley. 



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

 the throat ; spike 3 4' long, linear, compressed ; lateral spikelets abortive, awn- 

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

 malting to the former species. June. 



3. H. JUBATUM. Squirrel-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 palece produced into fine, 

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

 (D Marshes, N. Eng. to Mo., N. to Subarc. Am. June. 



4. H. PUSILLUM. Nutt. 



St. 4 & high, decumbent or geniculate at the base ; hs. about !' long, 

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

 linear, about !' long; glumes by 3s, collateral, imbricated, lateral; abortive Jls. 

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

 all awned, the inner setaceous from the base ; awns 1' 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; hs. 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. 7J. Natu- 

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



2. L. TEMULENTUM. Poisonous Darnel. 



St. terete, smooth, 2f high ; Ivs. lance-linear, rough-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. (D Remarkably distinguished 

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



55. ELtMUS. 



Gr. eXvw, 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 4f high ; Ivs. lance-linear, flat, scabrous, deep green, 

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



