144 GRAMINEAE. 
6. Muhlenbergia comata (Thurb.) Benth. Hairy Muhlenbergia. 
) (Fig. 325.) 
Vaseya comata 'Thurb. Proc. Phila. Acad. 1863: 79. 1863. 
Muhlenbergia comata Benth.; Vasey, Cat. Grasses U. S. 39. 
1885. 
Culms 1°-214° tall, erect, slender, smooth and glabrous. 
Sheaths shorter than the internodes, smooth or slightly 
scabrous; ligule about 4’ long, truncate, naked or mi- 
nutely ciliate; leaves 2%4’-5’ long, 1/’-2’’ wide, erect, 
flat, rough; panicle often tinged with purple, 2’-4’ in 
length, dense, branches 1%4’-114’ long, erect; outer scales 
of the spikelet equal, or the second 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; Kansas (?), Colorado to California. Aug.— 
Sept. 
7. Muhlenbergia tenuiflora ( Willd.) B.S.P. Slender Muhlenbergia. 
(Fig. 326.) 
Agrostis tenuiflora Willd. Sp. Pl. 1: 364. 1798. 
Agrostis pauciflora Pursh, Fl. Am. Sept. 1:63. 1814. 
Muhlenbergia Willdenovii Trin. Unifl. 188. 1824. 
oh el TG tenutfiora 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; leaves 
2%4/-7’ long, 1’/-4’’ wide, narrowed toward the base, 
acuminate, scabrous; panicle 5/-9’ long, slender, its 
branches 1/—3%’ long, appressed; outer scales of the 
spikelet unequal, half to two-thirds the length of the 
third one, awn-pointed, scabrous; third scale 11¢//— 
1%’ long, scabrous, bearing an awn 2-4 times its 
length. 
In rocky woods, Massachusetts to southern Ontario and 
Minnesota, south to Alabama and Texas. Aug.—Sept. 
imble 
) 
Muhlenbergia diffusa Schreb. Beschr. Gras. 2: 143. pl. 57. 
1772-9. 
Glabrous, culms 1°-3° long, decumbent, or often 
prostrate or creeping and ascending, very slender, dif- 
fusely branched. Sheaths shorter than the internodes, 
loose; ligule short, fringed; leaves 132’-3'4’ long, 
14//-2/’ wide, scabrous; panicle 2’-S’ long, slender 
somewhat lax, its branches 1/-2’ long, erect; outer 
scales of the spikelet minute, the lower one often 
wanting; the third scale, exclusive of the awn, about 
1’’ long, strongly scabrous, particularly upon the 
nerves; the awn 14//-2”’ in length. 
8. Muhlenbergia difftsa Schreb. N 
Will. Dropseed Grass. (Fig. 327. 
On dry hills and in woods, Maine and southern Ontario 
to Minnesota, south to Florida, Kansas and Texas. 
Aug.—Sept. 
