598 CLXI. GRAMINE^. Agrostis. 



the lengtli of the paleae; palecz smooth, the lower one shorter; sta. 3. — Long 

 Island, Kneiskern. July. 



0. 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, interior valve 

 veined, apiculate, superior valve 2-veined, shorter than the outer one ; sta.'6\ 

 anth. linear, reddish; stig. 2; sty. short; //•. roundish, smooth. — Watertown, N. 

 Y. Craive. 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 w^hen dry, margin scabrous ; sheaths much shorter than the 

 internodes ; stip. short; jian. 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.-T-Tj. Penn. to Flor., 

 barrens, Oct. 



§ 3. MuHLENBERGioiDE.i:. Glumes shorter tlmii the palecz. 



11. A. Mexican A. (A. lateriflora. M:c. 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. — % Wet shadesj 

 N. Eng. to Ohio f 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 ; _^«/r/c/5 simple, filiform, with appressed branches, and 

 crowded spikelets; palcce equal, longer than the acute glumes. — % Rocky hills, 

 New Eng. to 111., frequent. Aug. 



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



St. ascending, 2— 3f long, much branched, difluse, 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 paleas ; awn several times longer than the spikelet. — U Rockv shades, 

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



14. A. WiLLDENowii. Trin. (A. tenuiflora. Wllld.) 



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

 branches ; Ivs. 6 — 9' by 2—3", lanceolate, veined, scabrous, spreading, wuth 

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

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

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

 July, August. 



15. A CRYPTANDRiA. Torr. 



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

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

 nearly equal paleag ; stems 3f high ; sUaths bearded at the throat. Very abundant 

 at Buffalo. Aikin. 



16? A. LONGiFOLiA. Torr. (A. aspera. M/cA.t. ?) 



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

 closed sheaths and bearded stipules; 7;a?i/cto terminal and lateral, contracted 

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

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

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



