352 CYPERACEAE. 
180. Carex arcta Boott. Northern Clustered Sedge. (Fig. 850.) 
Carex canescens var. polystachya Boott; Richards. Arct. 
Exp. 2: 344. 1851. Not C. polystachya Sw. 1803. 
Carex arcta Boott, Il. 155. pl. 497. 1867. 
Rather light green but not glaucous, culms slen- 
der, usually strictly erect, 1°-24° tall, rough above, 
longer than or sometimes overtopped by the leaves 
which are flat and about 1’’ wide. Lower bract 
bristle-form and longer than its spike, or short, or 
wanting; spikes oblong, many-flowered, 3//-4/% 
long, about 214’’ in diameter, all aggregated into a 
terminal ovoid cluster about 1/ long, the staminate 
flowers basal; perigynia pale, ovate, many-nerved, 
mostly spreading, tapering into a rough beak about 
one-half as long as the body; scales membranous, 
pale brown, usually acute, shorter than the peri- 
gynia; stigmas 2. 
In swamps and wet woods, Maine and New Bruns- 
wick to Manitoba, Minnesota and British Columbia. 
June-July. 
181, Carex tenuiflora Wahl. Sparse-flowered Sedge. (Fig. 851.) | 
Carex tenuiflora Wahl. Kongl. Vet. Acad. Handl. (IT.) 
24:147. 1803. 
Light green, culms very slender or filiform, erect or 
reclining, rough above, 8’-2° long. Leaves '3’’ wide 
or rather more, flat, usually much shorter than the 
culm; spikes only 2-4, clustered at the summit, sub- 
globose, few-flowered, about 21%’’ in diameter, bract- 
less or the lowest with a short bract; perigynia pale, 
elliptic, very obscurely few-nerved, narrowed at both 
ends, 1//-1(’’ long, more than 14’ wide, narrowed — 
at both ends, beakless, spreading; staminate flowers 
basal; scales nearly white, hyaline, acute or obtusish, 
about equalling the perigynia; stigmas 2. 
In bogs, New Brunswick to Manitoba, south to Maine, 
Vermont, central New York and Michigan. Local. Also 
in Europe. Summer. 
182. Carex Heleonastes Ehrh. Hudson 
Bay Sedge. (Fig. 852.) 
Carex Heleonastes Ehrh.; l. f£. Suppl. 414. 1781. 
Culms slender, stiff, erect, very rough above, 6/— 
18’ high. Leaves rigid, erect, becoming involute, 
less than 1’ wide, shorter than the culm; bracts 
very short or none; spikes 3-5, subglobose, several- 
flowered, brown, about 214’/ in diameter, clustered 
at the summit, the staminate flowers basal; perigynia 
broadly ovate or ovate-elliptic, blunt-edged, faintly 
several-nerved, about 1’’ long, more than 4’ wide, 
tipped with a short sharp beak; scales ovate, brown 
with broad hyaline margins, about as long as the 
perigynia; stigmas 2. 
Hudson Bay to Manitoba and the Canadian Rocky 
Mountains. Alsoin Europe. Summer. 
