598 CLXI. GRAMINE^. Agrostis. 



the length of the palese ; palece smooth, the lower one shorter ; sta. 3. — Long 

 Island, Kneiskern. July. 



9. A. HETEROLEPis. Wood. (Vilfa heterolepis. Gray.) 



St. 1 — 2f high, smooth ; Ivs. setaceous, somewhat convolute, scabrous on 

 the margins; lower sheaths pubescent, upper ones smooth; panicle spreading, 

 pyramidal, few-flowered; glumes purplish, outer one subuliform, inner one 

 ovate, cuspidate, membranaceous in texture, 1-veined ; valves of the perianth 

 oblong, obtuse, thin, a little shorter than the superior glume, inferior valve 

 veined, apiculate, superior valve 2-veined, shorter than the outer one ; sta. 3 ; 

 a7ith. linear, reddish ; stig. 2 ; sly. short ; fr. roundish, smooth. — Watertown, N. 

 Y. Crawe. Aug., Sept. 



10. A. JUNCEA. Michx. (A. Indica. Muhl.) 



Glaucous ; St. erect, 1 — 2f high, terete, slender ; Ivs. erect, 2 — 6" by 1", 

 concave, convolute when dry, mai'gin scabrous ; sheaths much shorter than the 

 internodes ; slip, short; pan. oblong-pyramidal, branches verticillate, about in 

 6s ; glumes purple, lanceolate, acute, upper as long as the paleae, the lower 

 twice shorter ; palea subequal ; anth. and sty. whitish. — % Penn. to Flor., 

 barrens. Oct. 



^ 3. MuHLENBERGioiDE^. Gliimes shorter than the palecp. 



11. A. Mexican A. (A. lateriflora. Mr. Muhlenbergia. Mex. Trin.) 



St. erect or ascending, with swelling nodes, much branched and leafy 

 above, often nearly leafless below, IJ — 3f high ; Irs. lanceolate, scabrous, 

 with half-clasping sheaths ; panicles numerous, terminal and lateral, narrow 

 and dense-flowered, lateral ones partly enclosed in the sheath ; glumes narrow, 

 acuminate, mostly shorter than the subequal, pubescent palese. — '2J- Wet shades, 

 N. Eng. to Ohio ! and 111., common. 



12. A. soBOLiFERA. Muhl. (Tricochloa. Trin. Muhlenbergia. Gray.) 

 St. erect, slender, producing shoots at base, sparingly branched, 18 — 30' 



high ; branches erect and filiform ; Jiodcs not swelling ; Ivs. linear-lanceolate, 

 with open sheaths ; panicle simple, filiform, with apprcssed branches, and. 

 crowded spikelets ; palea equal, longer than the acute glumes. — 1\ Rocky hills, 

 New Eng. to 111., frequent. Aug. 



13. A. sYLVATiCA. Torr. (Muhlenbergia. Gray.) 



St. ascending, 2 — 3f long, much branched, diffuse, smooth, with swelling 

 nodes ; Ivs. lanceolate, scabrous, veined, 4 — 6' long, with smooth, open sheaths ; 

 panicles slender, rather dense ; glumes nearly equal, acuminate, a little shorter 

 than the palese ; awn several times longer than the spikelet. — 71 Rocky shades, 

 N. Y. to 111., N. J., Penn. Sept. 



14. A. WiLLDENOwii. Trin. (A. tenuiflora. Willd.) 



St. erect, subsimple, pubescent at the nodes, with a few appressed 

 branches ; Ivs. 6 — 9' by 2-— 3", lanceolate, veined, scabrotis, spreading, with 

 pubescent sheaths ; panicle contracted, very slender and long, with remote, fili- 

 form branches; glumes subequal, acuminate, half as long as the palese; awn 

 3 — 4 times the length of the spikelet. — %. Rocky woods, Can. and U. S. 

 July, August. 



15. A CRYPTAXDRIA. Tom 



Pa?iicZe pyramidal, with spreading, generally alternate branches, hairy at 

 the axils ; fis. subracemed ; lower gluvie very short, upper one as long as the 

 nearly equal paleas ; stems 3f high ; sheaths bearded at the throat. Very abundant 

 at Buffalo. Aikin. 



IGl A. LONGiPOLiA. Torr. (A. aspera. Michx.?) 



St. erect, simple, 2 — 4f high; Its. 2f long, filiform at the end, with smooth, 

 closed sheaths and bearded stipules; ;)«?i/cZo- terminal and lateral, contracted 

 into a spiked form, generally concealed in the swelling sheaths ; glumes dusky- 

 purple, much .shorter than the subequal, smooth, spotless palese. — Sandv fields. 

 Northern States. Sept., Oct.— Perhaps a Sporobolus. 



