﻿Mackenzie: Notes on Carex 



Specimens examined 



Oregon: "Along Clark's Creek, about three miles above 

 mouth. Altitude 3,140 ft.," E. P. Sheldon 8854, September 9, 

 1897 (type in Herb. K. M., duplicate in Herb. N. Y. Bot. 

 Garden); Crow Creek, Wallowa County, 4,300 feet alt., E. P. 

 Sheldon 8428, June 29, 1897 (N. Y., K. M.); ditch sides of Mal- 

 heur River, Cusick 2549^ June 7, 1901 (N. Y.). 



Idaho: House Creek, Owyhee County, Nelson & Machride 

 1826, June 30, 1912. 



California: "Jess Valley to Blue Lake," Griffiths & Hunter 

 42Q, August, 1902 (N. Y.). 



Carex exserta sp. nov, 



'ostrata Kiikenth.; Engler's Pflanzenreich 42": 



Very densely cespitose, the culms very slender and wiry, 5-25 

 cm. high, obtusely triangular, smooth, equalling or exceeding 

 leaves, brownish, the basal sheaths filamentose. Leaves with well- 

 developed blades two to four to a fertile culm, clustered above base, 

 acicular, channelled, little roughened towards apex, 0.25-0.5 mm. 

 wide, i-io cm. long, the sheaths tight, hyaline ventrally. Spike 

 solitary, androgynous, 7-15 mm. long, the staminate part half or 

 more length of whole, the scales reddish-brown, obovate, obtuse, 

 minutely hyaline margined, the pistillate part up to 6 mm. wide with 

 two to twelve ascending perigynia, the scales orbicular-ovate, 

 obtuse, dull reddish brown with hyaline margins, exceeded by ripe 

 perigynia. Bract scale-like or slightly developed. Perigynia obo- 

 void, obtusely triangular, 2-5 mm., nearly 2 mm. wide, rounded at 

 base and apex, nerveless, TDUt obscurely two-ridged, essentially beak- 

 less, papillose-puberulent, brownish tinged, hyaline and obliquely 

 cut at mouth. Achenes triangular, obovoid, closely filling peri- 

 gynia, sessile brownish, 2 mm. long, apiculate, jointed with the 

 very short, black exserted style. Stigmas three. Racheola 

 conspicuous. 



This characteristic Californian species differs constantly from 

 the more eastern and northern Carex filifolia Nutt. in the essen- 

 tially beakless perigynia and the duller colored scales. The style 

 although very short is exserted, black and conspicuous. 



The following specimens have been examined, all from the Sierra 

 Nevada of California, at elevations between 1,500 and 3,500 meters: 



