86 TRIANDRIA. DIGYNIA. 
valves coriaceous, broad, with many awns; 
awns rigid and divergent. Corolla 2 vaiveds 
outer valve terminated by 2 or 3 awns.—Flow- 
ers spiked, intermediate masculine; lateral, her- 
maphrodite, sessile. 
Small grasses, allied to Elymus, valves of the calix re- 
markably rigid and truncate, deeply divided in.o many 
flat and long scabrous awns; valves of the corolla also sl- 
milarly divided and awned. : = 
| Species. 1.4. *Hystrix. Spike squarrose, with very 
long recurved and divergent awns: calix smooth. gene- 
rally 4-parted: to the base: segments mosily bifid, un- 
equally 2-awned; spikelet about 4 flowered, the 2 mascu~ 
line or neuter pedicellate, and intermediate; dorsal valve 
of the corolla terminated by about 2 or 3 unequal awns. 
Considerably allied to Elymus. Culm 4 to 6 inches 
high. Leaves scabrous, strate, pungently acute, about 
2 inches long. Spike 1 or 2 inches, sheathed at the base. 
Richis flexuose, compressed, narrow, articulations dis- 
tinct. Spikelets alternate, about 4-flowered, lateral her- 
maphrodite flowers 2, sessile; intermediate, pedicellate, 
the lower masculine, the uppermost smaller, abortive. 
Calix as in Elymus, mostly 4-cleft to the base; segments 
usually bifidy striate, divergent, terminating in very long 
_-* ‘Unequal awns, exterior awn more than 2 inches, subulate, 
: and recurved at an obtuse angle, interior awn shor er and 
more slender. Corolla, dorsal valve terminated by a Jong 
: wn arising from betwixt two slender and unequal setz; 
“inner valve somewhat ciliate, terminated also by 2 short 
 eap tlary awns. 
On the arid plains of the Missouri. 
Of this genus there are 2 species in the South of Fu- 
~ rope, one of them also common to Barbary, and the other 
-» to Candia, there are likewise 2 other species peculiar 
"to those two places, : 
118, ELYMUS. LZ, (Lyme-grass. Wild-Rye.) 
_ Calices lateral, 2-valved, many-flowered, ag- 
: -gregated | y pairs, in the manner of a 4-leaved 
~ involucrum. Corolla 2-valved. ; 
Flowers in simple spi kes, alternately imbricate aed 
a common axis; spikelets 2, 4, or re lest ie Sak ge 
more rarely by threes in each indenture of the axis; valves 
ef the calix or common inyolucrum, very narrow and ri- 
