431 
23. Muhlenbergia Sobolifera. Trinius. 
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Syn. —Agrostis sobolifera, Muhl. Cinna sobolifera, Link. 
Culm erect, sparingly branched ; panicle simple, contracted, very 
slender or filiform ; glumes barely pointed, almost equal, one-third shorter 
than the equal paleae; lower palea abruptly short-mucronate. Open 
rocky woods. Perennial; flowers in August. Culms 1 to 2 feet high. 
Ohio, Michigan and Illinois. 
24. Muhlenbergia Glomerata. Trinius. 
Stn. —Agrostis racemosa, Michx. A. setosa, Muhl. Polypogon 
glomeratus, Willd. P. setosus, Spreng. P. racemosus, Nutt, Cinna 
racemosa, Kunth. 
Culm erect, sparingly branched or simple ; panicle oblong, linear, 
contracted into an interrupted glomerate spike, long-peduncled, the 
branches sessile; glumes awned, nearly equal, and (with the bristle-like 
awn) about twice the length of the unequal very acute paleae. Peren- 
nial; flowers in August and September. Culms 1 to 2 feet high. Grows 
mostly in swamps. Wisconsin, Illinois, Michigan and Ohio. 
25. Muhlenbergia Mexican a. Trinius. 
Syn. —Agrostis Mexicana, Linn. A. lateriflora, Michx. A. filiformis, 
Muhl. Cinna Mexicana, Link. 
Culm erect, much branched; panicles lateral and terminal, often in¬ 
cluded at the base, contracted, the branches densely spiked-clustered, 
linear, (green and purplish ;) glumes awnless, sharp-pointed, unequal, 
the upper about the length of the very acute lower palea. Perennial; 
flowers in August. Culms 2 to 3 feet high. A troublesome weed in 
low grounds. Wisconsin, Illinois, Michigan and Ohio. 
Dr. Darlington says that this species makes an indifferent pasture in 
the latter part of summer. Here it is not found in sufficient quantity to 
he of any value, except as it helps to make up the general grassy sur- . 
face by which the earth is beautified and adorned. 
26. Muiilenbergia Sylvatica. Torrey and Gray. 
g yNi —Agrostis sylvatica, Torr A. diffusa, Muhl. 
Culm ascending, much branched and diffusely spreading, smooth; 
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