ELYMUs. TRIANDRIA. DIGYNIA. 137 



Gen. pi. 128. Nutt. Gen. I. p. 86. Roein. ^ 

 Schult. Gen. 351. P. de Beauv. t. XX. f. 7 et 

 11. Trin. Agrost. 108. Calyx almost wanting in 

 E. Hystrix. Lyme grass. 



1. E. virginicus L. : spike erect, coarctate ; spikelets in 

 pairs, 2 — 3-flowered ; florets smooth ; glumes lanceolate, 

 nerved. Willd. Enum, h. Berol. I. p. 131. Spec. 1. p. 469. 

 Mich, Fl.l.p.65. B ig. Bost. ip. 28. Pursh Fl. \.ip. 89. 

 Elliott Sk. l. p. 180. Muhl. Gram. ip. 176. Roem.^ 

 Schult. II. p. 776. E. caroliniamis Walt. Car. p. 82. 

 HoRDEUM flosculis omnibus hermaphroditis, &ic. Gron. Virg. 

 p. 13. 



i?oor perennial. Culm 3 — 4 feet high, erect, smooth, terete. 

 Leaves flat, 8 — 10 inches long, nearly half an inch broad, 

 bright green. Stifiule nearly obsolete. Spike stiffly erect, 

 thick. Glumes lateral, a little connate and thickened at the 

 base, forming a sort of involucrtim around the spikelets, with 

 several elevated nerves on the external surface ; the extremity 

 produced into a subulate bristle. Inferior valve of the corolla 

 oblong-lanceolate, naked ; superior valve a little shorter, emar- 

 ginate, concave on the back, scabrous on the margin and to- 

 wrards the extremity. Bristle of the inferior florets longer than 

 the calyx. Stamens 3. Germen bearded at the tip. 



Hab. On the banks of rivers ; abundant on the Island of New- 

 York and at Hoboken. July — August. 



2. E. canadensis L.: spike nodding at the extremitj, 

 patulous ; spikelets 3 — 5-flowered ; florets hairy ; glumes 

 linear-subulate. W ill d. Enum.h. Berol. I. p. 131. Spec. 

 I. p. 468. PurshFUl.^. 89. Muhl. Gram. p. 178. 

 Roem. ii- Schult. II. p. 776. E. philadelphicus Lin. 

 Amoen. acad. IV. p. 266. 



Root creeping. Culm 3 — 4 feet high. Leaves flat and smooth, 

 dark green. Sheaths sometimes a little pubescent on the 



• margin. Stifiule very short. Sfiike about 6 inches long, gen- 

 erally a little pendulous at the extremity. Spikelets spread- 

 ing ; the lower ones sometimes ternate. Glumes marked on 

 the outside with 3 or 4 elevated nerves, terminating in a bristle 

 shorter than that of the florets. Inferior valve of the corolla 

 strigosely hairy ; superior valve obtuse. 

 Hab. On the banks of rivers ; rarer than the preceding species. 

 August. 



/S. g/awci/b/ii/5*: leaves glaucous. E, glaucifolius Willd. 

 Enum. h. Btrol. I. p. 13. PurshFl. I. p. 89. Muhl. 

 Gram. p. 177. Roem. ^ Schult. II. p. 776. 



Hab. On the rocky shore at Hoboken, New- Jersey, &c. 

 August. 



18 



