ACROSTis. TRIANDRIA. DIGYNIA. 91 



branches smooth. Calyx smooth ; glumes carinate ; one of 

 them 3-nerved. Co7-oUa twice as long as the calyx; one of 

 the valves acuminate and somewhat awned. 6>f</ oblong, 

 brown, transparent, spotted or scaly at the base. Afu h t. 

 Hab. On dry hills. Pennsylvania. M u /i i e n b c r if. Sep- 

 tember. 



The two last species are very nearly allied, and are by 

 Muhlenberg thought to be scarcely distinct. It is pro- 

 bable that one ol tliem is the Agrostis asperu of Michaux, 

 but which, can only be determuiea by a comparisou with the 

 Herbarium of this botanist. 



10. ClNNAp L. 



Calyx 2-valved, compressed, nearly equal. Corolla 

 linear, compressed, shortly stipitate, naked at the base ; 

 inferior valve inclosijig the superior, with a short awn 

 near the summit. Stamen 1. Style 1. Gen. pi. 20. 

 Nu 1 1. Gen. I. p. 45. Ju s s. p. 29. P.de Beau v, 

 Agrost. p. 31. t. VII. f. 12. Trin. Agrost. 43. Habit 

 ot Arundo. Allied to Agrostis. Flowers panicled. 



C. arundinacea Wi lid.: panicle large, capillary, loose ; 



leaves broad-linear; culm smooth. W Hid. Spec. 1. p. 31. 



4xcL syn. FoTsk, Mich. Fl. I. p. 38. Muhl, Gram. 



p. 1. Agrostis Cnina L a wz. ^^c Are 6. Gram. t. 49. Pursh 



Fl.]. p. 64. Eoem. 4^ Schuit. II. p, 373. A. monan- 



lira {Home m.) R. ^ S. 1. c. p. 374 ? 



Boot a little tuberous, perennial. Cuhn 2 — 5 feet high, erect, 

 simple, terete, very smooth. Leaves a foct or m(»re in length, 

 3 — 4 lines wide, smooth, pale green. Stipule elongated, la- 

 cerate. Panicle terminal, 6 — 10 inches long, aiteiiuated, a 

 little secund or nodding ; ^floivcrfi green. Glumes of the calyx 

 linear-lanceolate, very acute, scarious on the margin; the su- 

 perior 3-nerved, scabrous on the keel. Corolla abcut as long 

 as the superior glume of the calyx, snjooth ; inferior valve 

 with a short straight awn a little below the tip. Antlitr purple. 

 Style 1 ; stigmas 2, plumose. Seed oblong, acute. jVectaries 

 minute, ovate, collateral. 

 Hab. In swamps and wet shady woods; common. August- 

 September. Pursh remat ks that this plant grows on rivers 

 and islands under tide water ; which must be some mistake, 

 as it is by no means an aquatic grass. It is stated by Mu h- 

 lenberg to be good lodder. The height of the culm and 

 size of the flowers vary considerably. 



11. POLYPOGON. Desfontaines, 



Calyx 2-valved, l-fiouered; valves nearly equal, 

 terminating in a bristle. Corolla 2-valved, shorter than 



