NoTeEWorRTHY NortTH AMERICAN GRASSES 469 
KoELERIA BRACHYSTACHYS DC. Hort. Monsp. 120. 1813. 
This European species was found at Pensacola, Florida, by S. 
M. Tracy, June 1, 1901, and we also have a specimen from King’s 
Valley, California, collected by Mrs. R. M. Austin, July, 1882. 
By some European authors it is reduced to Koeleria phleoides, but 
although closely related to that species we believe it to be valid, 
being distinguished by its glabrous spikelets. In Koeleria phleoides 
the glumes are prominently pilose. 
SCLEROPOA RIGIDA (Linn.) Griseb. Spicil. Fl. Rumel. 2: 431. 1844 
Poa rigida Linn, Amoen. Acad. 4: 265. 1759. 
Festuca rigida Kunth. Enum. 1: 392. 1833. 
This European species was introduced at Charleston, S. C., 
early in the nineteenth century, as it was considered by Elliott in 
his Sketch of the Botany of South Carolina and Georgia 1: 164. 
1817.* It has also been found at Mobile, Alabama, on ballast, 
by Dr. Chas. Mohr, and at Fort Morgan, Alabama, by S. M. 
_ Tracy, no. 7212, April 27, 1901, and should, we believe, be con- 
sidered as a constituent of the flora of the southern United States. 
Sitanion marginatum sp. nov. 
A densely caespitose, bright green glabrous perennial, 2-3 
dm. high with short, usually spreading leaves, rather short 
spikes, and broad empty glumes. Ligule short, membranaceous ; 
leaf-blades linear-lanceolate, the basal ones 5-9 cm. long, those 
of the culm shorter, glabrous beneath, scabrous on the rather 
prominent white, cartilaginous margins. Spikes 3-6 cm. long, 
exserted, rarely partly enclosed in the upper sheath. Spikelets 
crowded ; empty glumes lanceolate, 1-1.2 mm. wide, about 5 mm. 
long, acuminate into a spreading awn about 1.5 cm. long; flower- 
ing glumes glabrous, about 7 mm. long, bearing an awn similar to 
that of the empty glumes. 
Type specimen, no. 334. E. D. Merrill and E. N. Wilcox, col- 
lected on bare open slopes, Teton Mountains, above Leigh’s Lake, 
Wyoming, July 26, 1901, altitude about 3,300 m. 
A peculiar species very similar in habit to Szfanion glabrum, 
J. G. Smith, but on account of its relatively broad empty glumes 
must be placed in the section Elymoides in relation with Sztanion 
ROE U.S: Dept. Agr. Div. Agros. 29: II. 1901. 
