2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



This plant of the mountains of New Mexico and Arizona has 

 heretofore been referred to the northern Carex petasata Dewey 

 (Carex Liddonii Boott). In the size and shape of its perigynia the 

 resemblance is very strong, but that species has perigynia strongly 

 and finely nerved on both faces, and in addition its scales are equal 

 in length to the perigynia, while in the species here proposed the 

 perigynia are nerveless or nearly so and the scales are noticeably 

 shorter than the perigynia. The long narrow perigynia with margins 

 serrulate to the tip serve to distinguish it from Carex f estiva and 

 its allied species. 



Specimens examined — New Mexico: San Francisco Mountains, 

 Wooton, July 15, 1892 (type, in herb. New Mexico Agricultural 

 College) ; Winter Folly, Sacramento Mountains, Otero County, 

 Wooton, August 13, 1899; North Eagle Creek, White Mountains, 

 Lincoln County, Turner 204, September 14, 1899. Arizona: 

 Southern slope of San Francisco Mountains, Cannon and Lloyd, 

 August, 1904. 



CAREX RUSBYI Mackenzie, sp. nov. 



Culms strictly erect, densely cespitose, 2.5-3.5 dm. high, much 

 exceeding the leaves, roughened on the angles above, brown and 

 slightly fibrillose at the base; leaves with well developed blades, 

 usually three or four to a culm, clustered near the base, the blades 

 erect-ascending, flat, with somewhat revolute margins, 1.5-3 mm. 

 wide, 1-2 dm. long, roughened on margins, the sheaths tight, not 

 readily breaking, not septate-nodulose, the opaque part neither trans- 

 versely rugulose nor red-dotted; spikes about five, all aggregated 

 into a rather stiff head, this 1.5-2.5 cm. long and about 7.5 mm. wide, 

 the upper spikes scarcely distinguishable, the lower readily dis- 

 tinguishable but little separated, each spike bearing the rather incon- 

 spicuous staminate flowers above and the one to N five ascending 

 perigynia below; bracts (except lowest) inconspicuous and resem- 

 bling the scales, the lowest bract exceeding its spike, 1 cm. long, 

 enlarged at base and terminating in a long cusp ; scales ovate, white- 

 hyaline, with green midrib, faintly tinged with reddish brown, 

 acuminate or cuspidate, about the width of and rather shorter than 

 the perigynia, these not completely concealed; perigynia narrowly 

 ovate, strongly plano-convex, with slightly raised borders, somewhat 

 spongy at base, nerveless or nearly so, 4 mm. long, about 1.75 mm. 

 wide, tapering to the substipitate base, tapering to the minutely 

 serrulate or nearly smooth beak, this about one-third the length of 



