440 Mackenzie: Notes on Carex 



in the foothills of north Colorado, near Ft. Collins, altitude 5,500 



feet, May 24, 1896. 



To this species also belong the following, collected in Wyom- 



ing : 



Sheridan county, Big 



weedy 2251, July 2, 

 Mountains, Tweedy 



July 20-Aug. 15 



' Carex concinnoides sp. nov. 



Plants strongly stoloniferous, the culms arising singly, slender, 

 smooth, 25 cm. or less high. Leaves crowded at the base of the 

 culm, the sheaths reddish-brown, strongly striate and more or less 

 filamentose, the blades flat, glabrous, more or less glaucous, 

 shorter than the culm, 20 cm. or less long, 2-4 mm. wide ; culm 

 bearing 2-4 bladeless long-acuminate sheaths at base, which are 

 usually tinged with purplish-red ; pistillate spikes one or two, 

 approximate at the summit of the culm, erect, sessile or short- 

 peduncied, 5-10-flowered, 5-10 mm. long and 4-5 mm. wide ; 

 the bract much shorter than the spike, usually tinged with reddish- 

 purple and hyaline on the margins above ; scales ovate-lanceolate, 

 narrower and shorter than the perigynia, acute, reddish-purple 

 with hyaline margins ; perigynium 2.5—3 mm. long, 1.5 mm. wide, 

 the body oblong-elliptical, tapering to a short stipitate base and 

 rather abruptly contracted into a short entire beak 0.5 mm. long, 

 strongly loosely pubescent ; staminate spike short, sessile or nearly 

 so, 8-15 mm. long, 2-3 mm. wide, the scales broadly ovate, 

 purplish-brown with a hyaline margin ; achenes closely enveloped 

 by the perigynia, 2 mm. long. 



This species may be distinguished from Carex Richardsonii 



R. Br. and Carex concinna R. Br., to which it is related, by the 



following key : 



Staminate spike 3-6 mm. long ; scales obtuse, one-half the length of the perigynia. 



C. concinna, 

 Staminate spike 8-22 mm. long; scales acute to acuminate, from little shorter than 



to exceeding the perigynia. 

 Perigynia loosely pubescent, wider and longer than the scales; staminate spike 



nearly sessile; pistillate spikes few-flowered. C. concinnoides. 



Perigynia appressed-pubescent, narrower and shorter than the scales ; staminate 

 spike noticeably peduncled ; pistillate spikes many-flowered. 



C Richardsonii. 



The type-specimen of this pretty little species was collected by 

 R. S. Williams at Columbia Falls, Montana, on June 7 and July 

 28, 1893, and is in the New York Botanical Garden Herbarium. 



