SEDGE FAMILY. 303 
34. Carex riparia Curtis. River-bank Sedge. (Fig. 704.) 
Carex riparia Curtis, Fl. Lond. 4: pl. 60, 1821. 
Glabrous, pale green, culms stout or rather slender, 
smooth, or somewhat rough above, erect, 2°-3 4° tall. 
Leaves elongated, sometimes nodulose, slightly sca- 
brous, somewhat glaucous, 3//-6’’ wide, about equal- 
ling the culm; lower bract similar to the leaves, the 
upper mostly narrower and shorter; staminate spikes 
I-5; pistillate spikes 2-5, cylindric, 114’—4’ long, about 
4// in diameter, the upper erect, sessile or nearly so, 
the lower more or less stalked and sometimes spread- 
ing or drooping; perigynia narrowly ovoid, firm, 
scarcely inflated, ascending, tapering gradually into a 
short 2-toothed beak, the teeth divergent; scales 
lanceolate or oblanceolate, long-aristate or acute, the 
lower longer, the upper equalling or shorter than the 
perigynia; stigmas 3. 
In swamps, Newfoundland to James’ Bay and Manitoba, 
south to Florida, Iouisiana, Texas and Idaho. Also in 
Europe. May-Aug. 
35- Carex acutiformis Ehrh. Swamp Sedge. (Fig. 705.) 
Carex acutiformis FEiirh. Beitr. 4: 43. 1789. 
Carex paludosa Gooden. Trans. Linn. Soc. 2: 202. 
1794. 
Culms stout, erect, sharp-angled, 2°-3° tall, 
smooth below, often rough above. Leaves 2%4//— 
6’ wide, flat, pale green, equalling or sometimes 
exceeding the culm; lower bracts similar to the 
leaves, the upper short and narrow; staminate 
spikes 1-3, stalked; pistillate spikes 3-5, nar- 
rowly linear-cylindric, 1 %4/—3/ long, 2’/-214’’ thick, 
the upper sessile or nearly so and erect, the others 
slender-stalked, spreading or drooping; perigynia 
ovoid, 144’ long, not inflated, strongly many- 
nerved, tapering into a very short and minutely 
2-toothed beak; scales awn-tipped, longer than the 
perigynia or the upper equalling them; stigmas 3. 
In swamps and wet meadows, eastern Massachu- 
setts. Naturalized from Europe. June-Aug. 
36. Carex Shortiana Dewey. Short’s Sedge. (Fig. 706.) 
Carex Shortiana Dewey, Am. Journ. Sci. 30:60. 1836. 
Glabrous, culms rather slender, erect, rough 
above, 1°-3° tall, usually overtopped by the upper 
leaves. Leaves elongated, roughish, 2//-214// 
wide; bracts short, narrow, rarely much exceed- 
ing the spikes; spikes 3-7, linear-cylindric, densely 
many-flowered, %’-114’ long, 144’/-2/” in diam- 
eter, erect, the lower stalked, the uppermost 
staminate below for about one-half its length; 
perigynia dark brown at maturity, compressed, 2- 
edged, orbicular or obovate, nerveless, slightly 
wrinkled, abruptly and minutely beaked, equal- 
ling or shorter than the scales, which are hyaline, 
scarious-margined, ovate or oblong-lanceolate, 
acute or obtuse and persistent; orifice of the peri- 
gynium entire or very nearly so; stigmas 3. 
In moist meadows and thickets, Pennsylvania to 
Virginia and Tennessee, west to Illinois, Missouri 
and the Indian Territory. May-July. 
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