TWO NEW SEDGES FROM THE SOUTHWESTERN 

 UNITED STATES 



By KENNETH K. MACKENZIE 



In going over the collections of the Agricultural College of New 

 Mexico, two species of Carex, which are apparently undescribed, 

 have been noted. At the request of Mr. Paul C. Standley, who 

 wishes to use the names in the Flora of New Mexico, soon to be 

 published, descriptions are given herewith. 



CAREX WOOTONI Mackenzie, sp. nov. 



Clumps medium-sized, without long running rootstocks, the culms 

 3-6 dm. high, usually exceeding the leaves, slightly roughened on 

 the angles above, phyllopodic; leaves with well developed blades, 

 3-8 to a culm, on the lower third, the sheaths overlapping, white- 

 hyaline opposite the blades, the blades flat, 1.5-3.5 mm. wide, 1-2 dm. 

 long, roughened toward the apex; blades of sterile culm leaves 

 longer and more attenuate; inflorescence consisting of 3-8 spikes 

 aggregated into a head 1.5-4 cm. long and 1-2 cm. wide, the spikes 

 ovoid-oblong, 8-16 mm. long, 6-8 mm. wide, containing a few incon- 

 spicuous staminate flowers at base and numerous appressed-ascend- 

 ing perigynia above ; lowest bract 3 cm. long or less, 2-4 mm. wide at 

 base, usually long-cuspidate, with hyaline margins at base and often 

 brownish tinged; upper bracts much shorter or wanting; scales 

 ovate, brownish, with green midrib and hyaline margins, usually 

 acute but varying from short-cuspidate to acutish, narrower and 

 noticeably shorter than the mature perigynia; perigynia lanceolate 

 or narrowly ovate-lanceolate, 7 mm. long, 2.5-3 mm - wide, narrowly 

 winged to the base, the margins often incurved, nerveless or nearly 

 so on both faces, noticeably dilated by the thick achene, round- 

 tapering at base, tapering at apex into the serrulate, shallowly bi- 

 dentulate beak, this about one- fourth the length of the whole peri- 

 gynium and winged to near the tip ; achenes lenticular, with oblong 

 faces, 2.5 mm. long, 1.5 mm. wide, rounded to a nearly sessile base, 

 rounded at apex, tipped by the straight style ; stigmas two. 



Smithsonian Miscellaneous Collections, Vol. 65, No, 7 



