43 



GRASS FAMILY. 



3. Muhlenbergia racemdsa (Michx.) B.S.P. Marsh Mul 



(Fig. 322.) 



Agrostis racemosa Michx. Fl. Bor. Am. i: 53. 1803. 

 J\fnlili'iih,-i-i>-ia glomerata Trin. Unifl. 191. 1824. 

 Muhlenbergta raconosa B.S.P. Prel. Cat. N. Y. 67. 1888. 



Culms i-3 tall, erect, usually much branched, 

 smooth and glabrous. Sheath smooth, those of 

 the culm shorter than the internodes, those of the 

 branches overlapping and often crowded; ligule 

 about ft" long, erose-truncate; leaves 2 / ~5 / long, 

 i // -3 // wide, scabrous; panicle 2 / ~4^ / in length, 

 usually dense and interrupted, the branches #'- 

 i' long, erect, or appressed, the spikelets much 

 crowded; outer scales of the spikelet acuminate, 

 2 // -3 // long, including the awn, smooth or sca- 

 brous, 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, Newfoundland to British Columbia, 

 south to New Jersey, Missouri and New Mexico. 

 Aug.-Sept. 



4. Muhlenbergia sylvatica Torr. Wood Muhlenbergia. 'Fig. 323.) 



Agrostis diffusa Muhl. Gram. 64. \ Ho*, 1809. 



Muhlenbergia sylvatica Torr. Fl I s i 



Culms i-3 tall, erect, branched, smooth or i 

 what scabrous. Sheaths smooth or slightly tcml 

 those of the culm shorter than the internodes, thoae 

 of the branches overlapping and often crowded; ligule 

 about y 2 " long, erose-truncatc; leaves a'-?' long, i"- 

 3" wide, rough; panicle 3'-?' in length, somewhat 

 lax, the branches i'-3' long, erect or ascending; outer 

 scales of the spikelet iV'-l^" long, awn-pointed, 

 scabrous; third scale equalling or somewhat exceed- 

 ing the outer ones, strongly scabrous, attenuate into a 

 slender awn 2-4 times its length. 



In moist woods and along strear 

 Ontario and Minnesota, south t< North Carolina, Tcn 

 and the Indian Territory. Anp. B 



5. Muhlenbergia ambigua Torr. Minnesota 

 Muhlenbergia. (Fig. 324.) 



Muhlenbergia ambigua Torr. Nicollet's Rep. 164. 1*43. 



Glabrous, culms i tall or lower, erect, branched, 

 smooth. Sheaths shorter than the internodes; ligule 

 about y 2 " long, erose-truncate; leaves \'-$ r long, 

 i "-2" wide, scabrous; panicle \'-$ f long, rigid, its 

 branches y 2 '-\' long, dense, appressed; outer scales of 

 the spikelet awn-pointed, unequal, the longer about 

 2" 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 Minnesota. 



