22 Rhodora [FEBRUARY 
bergia Schreberi, M. tenuiflora and M. umbrosa, all awned species, 
present forms in which the awns are very much reduced and that in 
the awnless M. sobolijera an awned form occurs. ‘The importance 
of the awn as a character for diagnosis in this group of species has 
apparently been much overestimated. 
7. MUHLENBERGIA RACEMOSA (Michx.) B. S. P. Prelim. Cat. Pl. 
N. Y. 67. 1888. Agrostis racemosa Michx. Fl. 1:53. 1803. 
Agrostis setosa Muhl. Gram. 68. 1817.  Trichochloa glomerata 
Trin. Fund. Agros. 117. 1820. Muhlenbergia glomerata Trin. 
Gram. Unifl. 191. 1824. This well known species ranges from 
Newfoundland to Washington and British Columbia and south- 
ward in the east to North Carolina and in the west to Texas 
(?), New Mexico and Arizona. 
7a. MUHLENBERGIA RACEMOSA RAMOSA (Vasey) Beal. Grasses N. 
Am. 2:253. 1896. M. glomerata ramosa Vasey Cat. Grasses 
U. S. 40. 1885. “A much branched spreading form, Illinois to 
Colorado and Montana” (Vasey l. c.). "Stout, much branched 
below, very leafy. Prairie regions." (Vasey Contrib. U. S. 
Natl. Herb. 3: 68. 1892.) No. 397 Griffiths from South Dakota, 
no. 405 B. F. Bush from Missouri, no. 2853 F. Clements from 
Nebraska and no. 265 B. B. Smyth from Kansas belong here. 
This is the common form in the prairie regions of the west. 
7b. MUHLENBERGIA RACEMOSA violacea Scribn. n. subsp. charac- 
terized by its slender simple culms usually violet or dark purple 
and more or less interrupted panicles, abruptly aristate glumes 
and comparatively small spikelets. ‘Type from North Hannibal, 
New York, collected by O. E. Pearce 1883 without number. No. 
748 E. H. Mearns from Minnesota belongs here. This subspe- 
cies is less well defined than the last. Itis apparently common 
in the north growing usually in bogs. 
8. Muhlenbergia glabrifloris Scribn. n. sp. A slender branching 
glabrous perennial 4-6 dm. high, from scaly rootstocks, with flat 
erect or ascending leaves, slender strict panicles and awnless 
spikelets 2.5-3 mm. long. Culms terete, very minutely scabrous 
for a short distance below the nodes, soboliferous at the base; 
sheaths somewhat compressed, smooth, mostly shorter than the 
internodes, crowded on the branches, naked at the throat; ligule 
very short, 1 mm. or less long, minutely ciliate on the edge; leaf- 
blades 2-10 cm. long, 1-4 mm. wide, acute, very minutely scabrous 
t. 
