618 MACKENZIE: NOTES ON CAREX 
August 19, 1915 (K.M.); Rock Creek Lake, Elkhorn Mountains, 
M. E. Peck 31, August 12, 1915 (K.M.); East Pine Creek, near 
Cornucopia, M. E. Peck 45, August 30, 1915 (K.M.); top of Mt. 
Ashland, Jackson County, M. E. Peck 6, July 16, 1913 (K.M.). 
“Carex abrupta sp. nov. 
Densely cespitose, the culms 4-6 dm. high, slender but erect, 
triangular, smooth, much exceeding the leaves, aphyllopodic, 
light brownish at base. Sterile shoots less numerous than fertile, 
with four to six erect leaves. Fertile culms normally making 
growth in one year, with three or four well-developed leaves just 
above the base, the sheaths hyaline ventrally, the blades flat, 
I.5~2.5 mm. wide, 5-15 cm. long; sterile shoots with similar leaves. 
Spikes four to eight, very densely aggregated in a suborbicular 
head 9-16 mm. long and nearly as wide, the spikes gynaecandrous, 
with few staminate flowers, ovoid, 5-8 mm. long, 5-6 mm. wide, 
rounded at base and apex, the perigynia ten to twenty in several 
ranks, ascending. Bracts scale-like. Scales ovate, chestnut brown 
with greenish center and at length hyaline margins, the midvein 
not conspicuous, obtuse, narrower and shorter than perigynia. 
Perigynia 3.75-4 mm. long, 1.5 mm. wide, plano-convex but 
thin-walled, soon brownish tinged with several conspicuous 
slender nerves on: both sides, oblong-lanceolate, rather nar- 
rowly margined to the rounded base, the body serrulate on 
the margins above, abruptly contracted into the slender blackish- 
tipped beak with smooth margins and white-hyaline apex, ob- 
liquely cut dorsally. Achenes lenticular, oblong-ovoid, yellowish, 
substipitate, 1.8 mm. long, nearly 1 mm. wide, apiculate, the style 
slender straight, at length deciduous; stigmas two. 
_ Distinguished by its abruptly beaked thin-walled strongly 
nerved perigynia. 
SPECIMENS EXAMINED 
CALIFORNIA: West Branch of North Fork of Feather River, 
near Sterling, Butte County, 3,000 ft., Heller 10820, June 7, 1913 
(type, in Herb. K.M.); Hot Springs Valley near Lassen Peak, 
6,000 ft., Jepson gror, June 9, 1910 (K.M.); Poison Meadow, Big 
Arroyo, Sierra Nevada, 9,500 ft., Jepson 1131, August 1-12, 1900 
(K.M.); Vivian Creek, San Bernardino County, 9,500 ft., Geo. B. 
Grant 6403, July 24, 1904 (Parish, K.M.); Mt. Tallac, near Lake 
Tahoe, 9,000 ft., Abrams 4848, July 29, 1911 (K.M.); North- 
eastern Modoc County, Mrs. Manning 952 in part, June, 1903 
