(>98 CLXI. GRAMINK^. AGROSTIS. 



the length of the paleae ; pakcs smooth, the lower one shorter ; sta. 3. Long 

 Island, Kneiskern. July. 



9. A. HETEROLEPIS. Wood. (Vilfa heterolepis. Gray.} 



St. I 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, interior valve 

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

 anth. linear, reddish; stig. 2 ; sty. short; fr. roundish, smooth. "Watertown, N. 

 Y. Crawe. Aug., Sept. 



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



Glaucous ; st. erect, 1 Bf high, terete, slender ; Ivs. erect, 2 6" by 1", 

 concave, convolute when dry, margin 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. 7J_ Penn. to Flor., 

 barrens. Oct. 



3. MUIILENBERGIOIDEJE. Glumes shorter than the palea. 



11. A. MEXICANA. (A. lateriflora. MX. Muhlenbergia. Mex. Trin.) 



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

 above, often nearly leafless below, 1 3f high; Ivs. 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 palere. i\. Wet shades, 

 N. Eng. to Oh'o ! 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; nodes not swelling; Ivs. linear-lanceolate, 

 with open sheaths ; panicle simple, filiform, with appressed branches, and 

 crowded spikelets ; palccz equal, longer than the acute glumes. 7J. 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 G' long, with smooth, open sheaths ; 

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

 than the paleee ; awn several times longer than the spikelet. ?j, 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, scabrous, spreading, with 

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

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

 3 4 times the length of the spikelet. 1\. Rocky woods, Can. and U. S. 

 July, August. 



15. A CRYPT ANDRIA. Torr. 



Panicle pyramidal, with spreading, generally alternate branches, hairy at 

 the axils ; fls. subracemed ; lowfr glume very short, upper one as long as the 

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

 at Buffalo. Aikin. 



161 A. LONGIFOLIA. Torr. (A. aspera. Michx.?} 



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

 closed sheaths and bearded stipules; panicles terminal and lateral, contracted 

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

 Purple, much shorter than the subequal, smooth, spotless paleae. Sandy fields, 

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



