TOO FLORA. 



glabrous. Leaves 5-12.5 cm. long, 2-6 mm. wide, scabrous; panicle 5-11.25 cm. 

 in length, usually dense and interrupted, the branches 1.25-2.5 cm. long, erector 

 appressed, the spikelets much crowded; outer scales of the spikelet acuminate, 4-6 

 mm. long, including the awn, smooth, or scabrous, especially on the keel; third 

 scale one-half to two-thirds as long, acuminate, the strongly scabrous midrib 

 excurrent in a short point. In wet places, Newf. to Br. Col., south to N. J.. Mo. 

 and N. Mex. Aug. -Sept. 



4. Muhlenbergia sylvatica Torn WOOD MUHLENBERGIA. (I. F. f. 323.) 

 Culms 3-9 dm. tall, erect, branched. Leaves 5-17.5 cm. long, 2-6 mm. wide, 

 rough; panicle 7.5-17.5 cm. in length, somewhat lax, the branches 2.5-7.5 cm. 

 iong, erect or ascending; outer scales of the spikelet 2. 5-3 mm. long, awn-pointed, 

 scabrous ; third scale equalling or somewhat exceeding the outer ones, strongly 

 scabrous, attenuate into a slender awn 2-4 times its length. In moist woods and 

 along streams, N. B. to Ont. and Minn., south to N. Car., Tenn., Neb. andthelnd. 

 Terr. Aug. -Sept. 



5. Muhlenbergia ambigua Torr. MINNESOTA MUHLENBERGIA. (I. F. f. 

 324.) Glabrous; culms 3 dm. tall or lower, erect, branched, smooth. Sheaths 

 shorter than the internodes; leaves 2.5-7.5 cm. long. 2-4 mm. wide, scabrous; 

 panicle 2.5-7.5 cm. long, rigid, its branches 1.25-2.5 cm. long, dense, appressed; 

 outer scales of the spikelet awn-pointed, unequal, the longer about 4 mm. in length 

 and exceeding the body of the third scale, which is scabrous, villous, and attenuate 

 into an awn 2-3 times its length; a fourth narrow awned scale is nearly always 

 present. Along a lake shore in Minn. 



6. Muhlenbergia comata (Thurb.) Benth. HAIRY MUHLENBERGIA. (I. F. f. 

 325.) Culms 3-7.5 dm. tall, erect, slender, smooth and glabrous. Sheaths shorter 

 than the internodes, smooth or slightly scabrous; leaves 6.2-12.5 cm. long, 2-4 mm. 

 wide, erect, flat, rough; panicle often tinged with purple, 5-10 cm. in length, dense, 

 branches 1.25-3.75 cm. long, erect; outer scales of the spikelet equal, or the sec- 

 ond a little the longer, smooth, scabrous on the keel; third scale shorter, smooth 

 and glabrous, bearing an awn 2-3 times its length, the basal hairs silky, erect, 

 fully as long as the scale. On prairies, Kans. (?) and Colo, to Cal. Aug. -Sept.- 



7. Muhlenbergia tenuiflora (Willd.) B. S. P. SLENDER MUHLENBERGIA. 

 (I. F. f. 326.) Culms 6-9 dm. tall, erect, slender, simple or sparingly branched, 

 smooth. Sheaths usually shorter than the internodes ; leaves 6.25-17.5 cm. long, 

 2-8 mm. wide, narrowed toward the base, acuminate, scabrous; panicle 1.25-2.25 

 dm. long, slender, its branches 2.5-8.75 cm. long, appressed; outer scales of the 

 spikelet unequal, half to two-thirds the length of the third one, awn-pointed, sca- 

 brous; third scale 2.53 mm. long, scabrous, bearing an awn 24 times its length. 

 In rocky woods, Mass, to southern Ont. and Minn., south to Ala. and Tex. Aug.- 

 Sept. 



8. Muhlenbergia difftisa Willd. NIMBLE WILL. DROPSEED-GRASS. (I. F. 

 f. 327. ) Culms 3-9 dm. long, decumbent, or often prostrate or creeping and as- 

 cending, very slender, diffusely branched. Sheaths shorter than the internodes, 

 loose; leaves 3.75-8.75 cm. long, 1-4 mm. wide, scabrous; panicle 5-20 cm. long, 

 slender, somewhat lax, its branches 2.5-5 cm - l n g erect, outer scales of the spike- 

 let minute, the lower one often wanting ; the third scale, exclusive of the a\vn, about 

 2 mm. long, strongly scabrous, particularly upon the nerves; the awn 1-4 mm. in 

 length. On dry hills and in woods, Me. and southern Ont. to Minn., south to 

 Fla., Kans. and Tex. Aug. -Sept. 



9. Muhlenbergia palustris Scribn. SWAMP MUHLENBERGIA. Culms slen- 

 der, weak, 6-10 dm. long. Sheaths smooth and glabrous; leaves erect, 3-5 cm. 

 long, about 2 mm. wide, smooth beneath and rough above; panicle slender, con- 

 tracted, 1-1.5 dm. l n g> i ts branches appressed; spikelets, exclusive of the awn. 

 2.5-2.8 mm. long, the first scale shorter than the second, which is about one-third 

 as long as the spikelet; the flowering scale 2.3-2.5 mm. long, shortly 2-toothed at 

 the apex, bearing an awn between the teeth 5.5-8 mm. long, the callus hairy. In 

 a swamp at Washington, D. C. Sept. 



10. Muhlenbergia microsperma (DC.) Trin. SMALL-SEEDED MUIILENBER- 

 GIA. (I. F f . 328.) Culms 1.5-4.5 dm. tall, erect, finally decumbent or somewhat 

 prostrate at base, slender, diffusely branched. Leaves 1.25-6.25 cm. long. 2 mm. 

 wide or less, scabrous; panicle 5-10 cm. in length, slender, open, the branches 2.5 



