GRASS FAMILY. 143 
3. Muhlenbergia racemosa (Michx.) B.S.P. Marsh Muhlenbergia. 
(Fig. 322.) 
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 1°-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 1%’ long, erose-truncate; leaves 2’—5’ long, 
1//-3/’ wide, scabrous; panicle 2/-414’ in length, 
usually dense and interrupted, the branches 14/— 
1’ 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. 1817. Not Host, 1809. 
Muhlenbergia sylvatica Torr. Fl. U. S. 1:87. 1824. 
Culms 1°-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 %’ long, erose-truncate; leaves 2/—7’ long, 1//— 
3// wide, rough; pahicle 3/-7’ in length, somewhat 
lax, the branches 1/—3/ long, erect or ascending; outer 
scales of the spikelet 11(’//-1%4’’ 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 streams, New Brunswick to 
Ontario and Minnesota, south to North Carolina, Tennessee 
and the Indian Territory. Aug.—Sept. 
5. Muhlenbergia ambigua Torr. Minnesota 
Muhlenbergia. (Fig. 324.) 
Muhlenbergia ambigua Torr. Nicollet’s Rep. 164. 1843. 
Glabrous, culms 1° tall or lower, erect, branched, 
smooth, Sheaths shorter than the internodes; ligule 
about 1%4’’ long, erose-truncate; leaves 1/-3/ long, 
1/’-2/’ wide, scabrous; panicle 1/-3/ long, rigid, its 
branches }4/-1/ 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. 
