72 TRIANDRIA, DIGYNIA. 



66. Elymus, Gen. pi. 128. (Gr amine a.) 



Calices lateral, 2-valved, many-flowered, aggre- 

 gated by pairs, in the manner of a 4 leaved 

 involucrum. Corolla 2-valved. Nutt. 



virginicus. j # £. spike erect, spikelets 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. 



villosus. 



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 

 Breck's Island, frequent. I have not found it elsewhere. Pe- 

 rennial. July. 



3. E. culm erect four feet high terete jointed, the 

 joints smooth. Leaves lanceolate smooth, scabrous 

 on the margin. Ligida 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. Fist. 2. MuhL 



A large species. On the rocky eminences near the 

 Schuylkill, west side, between Market street bridge and the 

 Woodlands. Rare. Perennial. July. 



