i86 



GRAMINEAE. 



Vol. I. 



5. Muhlenbergia racemosa (Michx.) B.S.P. 



Fig. 443- 



Wild Timothy. Satin-grass. 



Agrostis racemosa Michx. Fl. Bor. Am. 1 : 53. 1803. 

 Muhlenbergia glomerata Trin. Unifl. 191. 1824. 

 Muhlenbergia racemosa 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 i" long, 

 erose-truncate ; blades 2'-s' long, i"-3" wide, scabrous; 

 panicle 2'-4i' in length, usually dense and interrupted, 

 the branches i'-i' long, erect or appressed, the spike- 

 lets much crowded; outer scales of the spikelet acumi- 

 nate, 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, Maryland and New Mexico. Aug.-Sept. 



6. Muhlenbergia tenuiflora (Willd.) B.S.P. Slender Satin-grass. Fig. 444. 



Agrostis tenuiflora Willd. Sp. PI. 1: 364. 1798. 



Agrostis pauciflora Pursh, Fl. Am. Sept. 1 : 63. 1814. 



Muhlenbergia Willdenovii Trin. Unifl. 188. 1824. 



M. tenuiflora B.S.P. Prel. Cat. N. Y. 67. 1888. 



Glabrous, culms 2°-3° tall, erect, slender, simple or 

 sparingly branched, smooth. Sheaths usually shorter than 

 the internodes ; ligule short and truncate ; blades 2F-7' 

 long, 1 "-4" wide, narrowed toward the base, acuminate, 

 scabrous; panicle s'-o/ long, slender, its branches i'-3i' 

 long, appressed ; • outer scales of the spikelet unequal, half 

 to two-thirds the length of the third one, awn-pointed, 

 scabrous; third scale ii"-ii" long, scabrous, bearing an 

 awn 2-4 times its length. 



In rocky woods, Massachusetts to Minnesota, Alabama and 

 Texas. Slender-flowered Dropseed. Aug.-Sept. 



7. Muhlenbergia umbrosa Scribn. Wood or Woodland Dropseed. Fig. 445. 



Agrostis diffusa Muhl. Gram. 64. 1817. Not Host, 1809. 

 Agrostis sylvatica Torr. Fl. U. S. 1 : 87. 1824. Not L. 



1763- 

 Muhlenbergia sylvatica Torr. Cat. PI. N. Y. State, 188. 



1840. 

 M. umbrosa Scribn. Rhodora, 9: 20. 1907. 



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

 what scabrous. Sheaths smooth or slightly scabrous, 

 those of the culm shorter than the internodes, those 

 of the branches overlapping and often crowded; ligule 

 about 4" long, erose-truncate; blades 2'-/ long, i"-3" 

 wide, rough; panicle 3'-7' in length, somewhat lax, the 

 branches i'-$' long, erect or ascending; outer scales of 

 the spikelet il"-i4" 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, New Brunswick to 

 South Dakota, south to North Carolina and Oklahoma. 

 Aug.-Sept. 



