318 



CYPERACEAE 



89. Carex pseudo-scirpoidea Rydb. 

 Western Single-spiked Sedge. Fig. 765. 



Carex psciido-scirpoidcn Rydl). Mem. X. Y. Bot. Garden 1 : 78. 190C. 



Rootstocks stout, long-creeping, the culms phyllopodic, 1-4 

 dm. high, little roughened above, reddened at base. Leaves 5-10 

 to a culm, the blades flat, 2-3 mm. wide, the sheaths reddish- 

 brown tinged and puberulent ventrally ; culms dioecious, the 

 spikes solitary, 12-36 mm. long, 2-5 mm. wide, often with a bract 

 1-2.5 cm. long inserted a short distance below the head ; scales 

 covering perigynia, broadly ovate, brownish black with con- 

 spicuous hyaline margins ; perigynia numerous, appressed-ascend- 

 ing, obovoid, obtusely triangular in cross-section, 2.5 mm. long, 

 1.25 mm. wide, strongly pubescent all over, 2-keeled. tapering at 

 base, very abruptly contracted into the minutely bidentate beak 

 about 0.4 mm. long; achenes triangular, 1.5 mm. long; stigmas 3. 



Mountain sides, Canadian and Hudsonian Zones; ^Montana and Colorado, 

 west to Utah and Washington. Type locality: Montana. 



90. Carex stenochlaena (Holm) Mackenzie. 

 Alaskan Singie-spiked Sedge. Fig. 766. 



Carex scirpoidea stenochlaena Holm, Am. Journ. Sci. 18: 20. 1904. 

 Carex stenochlaena Mackenzie, Bull. Torrey Club 35: 269. 1908. 



Rootstocks densely matted, stout, the culms stoutish, 2.5-4 dm. 

 high, aphyllopodic, strongly roughened, reddened and somewhat fila- 

 mentose at base. Leaves 3-6 to a culm, the blades flat, 2-2.5 mm. 

 wide, the sheaths brownish tinged and puberulent ventrally; culms 

 dioecious, the spike solitary; staminate spike 2 cm. long, 3-5 mm. 

 wide; pistillate spikes linear, 1.5-3 cm. long, 4-7 mm. wide with an 

 elongated bract 0.5-5 cm. long inserted 0.5-3 cm. below; scales 

 somewhat shorter than perigynia, oblong-ovate, puberulent and 

 slightly ciliate, black with lighter midvein and narrow hyaline mar- 

 gin; perigynia numerous, black (at least towards apex), 4 mm. 

 long, 1.5 mm. wide, appressed-pubescent, the body lanceolate, 

 flattish, rounded at base, tapering at apex into the nearly entire 

 beak, 0.5 mm. long ; achenes triangular, 2 mm. long ; stigmas 3. 



Mountains, Transition and Canadian Zones; Alaska to Alberta, Idaho and 

 Washington. Type locality: Juneau, Alaska. 



91. Carex scirpoidea Michx. Canadian Single-spiked Sedge. Fig. 767. 



Carex scirpoidea Michx. Fl. Bor. Am. 2: 171. ISOo. 

 Carex wormskjoldiana Hornem. Fl. Dan. pi. 1528. 1816. 

 Carex michauxii Schw. Ann. Lye. N. Y. 1: 64. 1824. 



Rootstocks creeping, stout, the culms aphyllopodic, 

 2-4 dm. high, roughened above, reddened at base. 

 Leaves 2-4 to a culm, the blades flat, 1-2 mm. wide, 

 brownish tinged and minutely puberulent ventrally; 

 culms dioecious, the spike solitary ; staminate spike 

 somewhat smaller than the pistillate; pistillate spike 

 linear 1.5-3 cm. long, 2.5-5 mm. wide with a bract 

 some 3-10 mm. long at base ; scales shorter than peri- 

 gynia, oblong obovate, puberulent, obtusish, chocolate 

 brown with lighter midrib and narrow hyaline mar- 

 gins ; perigynia numerous, erect-appressed, 3 mm. 

 long, 1 mm. wide, oblong-elliptic, compressed orbicular 

 in cross-section, 2-keeled, obscurely triangular, whitish 

 pubescent, rounded at base, rounded at apex and ab- 

 ruptly narrowed into a nearly entire beak about 0.25 

 mm. long; achenes triangular, 1.5 mm. long; stigmas 3. 



Along streams, Arctic- Alpine Zone; Greenland to Alaska, 

 south to New Hampshire, New York, Michigan, Montana, and 

 Washington. Type locality: Hudson Bay. 



