598 CLXI. GRAMINEJE. AGROSTIS. 



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

 Island, Kneiskern. July. 



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



St. 1 2f high, smooth ; Iv s. 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; Jr. roundish, smooth. Watertown, N. 

 Y. Crowe. 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, 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. 1\. Penn. to Flor., 

 barrens. Oct. 



3. MUHLENBERGIOIDE.E. 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 paleae. 9J. 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; nodes not swelling; Ivs. linear-lanceolate, 

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

 crowded spikelets ; palea 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 6' long, with smooth, open sheaths ; 

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

 than the paleae ; awn several times longer than the spikelet. 1L 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 23", 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. 1J. Rocky woods, Can. and U. S. 

 July, August. 



15. A CRYPTANDRIA. Torr. 



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

 the axils ; Jls. subracemed ; lower glume very short, upper one as long as the 

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

 at Buffalo. Aikin. 



167 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 the swelling sheaths ; glumes dusky- 

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

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



