88 TRIANDRIA. DIGYNIA. agrostis- 



JRoot creeping?, perennial. Culm 2—3 feet high; branches at 

 first erect, but at length diffuse; nodes swelling. Leaves 

 spreading, distinctly nerved, sprinkled with subdiaphanous 

 dots, scabrous. Sheaths f^pen and smooth. Branches of the 

 panicle appressed and very slender. Calyx a little unequal j 

 glumes lanceolate, acuminate, white with a green scabrous keel, 

 1 -nerved. Corolla a thu'd longer than the calyx, a littlehairy 

 at the base; valves lanceolate, acute; the inferior with a straight 

 scabrous awn at the tip sometimes four times as long as the 

 flower. Stamens 3 ; anthers white. Seed dark brown, oblong. 



Hab. In rocky situations; common on the mountains of New- 

 Jersey. August. 



Nearly allied to the preceding, and perhaps not a distinct 

 Species. It is, however, easily distinguished by its branched, 

 diftuse culm. 



8. A. compressa*: whole plant very smooth ; culm erect, 

 compressed, simple ; panicle oblong, subcontracted, with ca- 

 pillary branches ; calyx equal shorter than the corolla, acute 5 

 corolla rather obtuse, smooth at the base. Tor ret/ Cat. 

 pi. New-York, p. 91. 



Root creeping, perennial. Culm a foot and a half high, sobo- 

 liferous at the base, leafy. Leaves linear, very narrow, almost 

 as long as the culm, compressed. Sheaths carinate, open. 

 Sti/iuie truncate, very short. Panicle terminal, purple, con- 

 sisting of a few simple, erect and flexuous branches. Glumes 

 of the calyx lanceolate; superior glume I -nerved, serrulate on 

 the keel, notciied at the apex, (sometimes muoonate and ra- 

 ther obtuse, or denticulate.) Corolla ovate ; valves often split 

 down 10 the base. Staineris — . Htyle 2 ; siig7nas plumose, 

 purple. 



Hab. Sandy swamps in the pine-barrens of New-Jersey. Sept. 

 Collected in 1817 by Mr. J. Goldy, an English botanist, 

 from whom I obtained specimens. 



9. A.serolina*: culm filiform,, much compressed ; leaves 

 very narrow, carinate, erect ; panicle attenuate, capillary, 

 erect; branches alternate ; calyx unequal, half as long as the 

 awnless corolla. 



Root perennial, fibrous. Culm a foot or 18 inches, very slender, 

 smooth, simple, or with one or two short branches at the base. 

 Leaves 2 — 3 inches long and half a line broad, finely attenu- 

 ated at the extremity. Sheaths compressed, shorter than the 

 joints, smooth. Stifiule ovate. Panicle very slender, 4 — 10 

 inches long; branches alternate, solitary, flexuous. Flowers 

 elliptical, on long pedicels, which are thickened below the 

 calyx. Glumes of the calyx unequal, ovate, obtuse or acute, 

 1 -nerved ; the inferior shorter than the corolla. Corolla twice 

 the length of the shorter valve of the calyx ; valves equal, ob- 

 long, obtuse, smooth. Stamens 3. Stigmas plumose. Seed 

 ovate, smooth, dark brown. 



