72 TRIANDRIA, DIGYNIA. 
66. Elymus, Gen. pL 128. f' Graminete. J 
lateral, 2=valved, many-flowered, aggre- 
gated by pairs, in the manner of a 44eaved 
involucrum. Corolla 2-valved. Nutt. 
virginicus. 1. E. Spike crcct, spikelcts 3-flowered, awned, gla- 
brous, by pairs ; calix lanceolate, nerved, as long 
as the spikes. Willd. enum. 
E. Carolinianus, Walt. 
Virginian Rye-grass- 
Three feet high. Between Market street bridge and the 
Woodlands, near the Schuylkill, frequent — elsewhere not so 
common. Perennial. July. 
hystrix. 2. E. culm erect ; spikelets expanding, destitute of 
an involucrum. Sp. pi 
Asprella hystrix, Willd. 
A very handsome species of Rye-grass two or three feet 
high. On the shaded woody banks of the Schuylkill near 
Brack’s Island, frequent. I have not found it elsewhere. Pe- 
rennial. July. 
tuiosus. 3. E. culm erect four feet high tei^ete jointed, the 
joints smooth. Leaves lanceolate smooth, scabrous 
on the margin. Ligula obsolete. Sheaths hir- 
sute ; strigose ; the upper ones smooth. Spike 
sub-erect, rachis hairy, nutant at the apex. Spike- 
lets somewhat spreading binate, 2 — 3-flowered. 
Involucre 4— 6-leaved, leaflets linear two-nerved 
aristated hairy-ciliated, 4 — 6-flowered. Cor. 2- 
valved hairy in the margin, one-valve awned, the 
awn upright, longer than the involucre, hispid. 
Stam^ 3. Pist< 2. MuhL 
A large species. On the rocky eminences near the 
Schuj^lkill, west side, between Market street bridge and the 
Woodlands. Rare. Perennial. July. 
