CYPERACEAE. 8 1 



Carex angustata Boott. ( C. acutina Bailey.) Tufted, glabrous, pale green; 

 stems 50-60 cm. high, usually scabrous above; leaves flat, thin, equalling or 

 shorter than the stems; lower bract as long as the inflorescence; spikes 4 or 5, 

 cylindrical, erect, approximate, 3-7 cm. long, the upper one or two staminate; 

 perigynia oval or elliptic, thin, straw-colored, granular, faintly nerved, the 

 short beak entire; scales obtuse, almost as long as the pergynia, not divaricate 

 at maturity. 



Infrequent; Portland, Oregon, Kellogg & Harford; Mount Hood, Oregon, 

 Henderson. 



Carex dives Holm. Stems 30-60 cm. high, erect, very rough; leaves flat, 

 broad, as long as the stems; bracts sheathless, leaf-like, the lowest exceeding 

 the inflorescence; spikes 6-7, the uppermost one or two staminate, the others 

 pistillate, densely flowered, 4-10 cm. long, peduncled, the lowest nodding; 

 perigynia oval, compressed, granular, 2-nerved, denticulate above, 2.5 mm. 

 long, pale green with purplish blotches, the beak short and entire; scales oblong, 

 purple with green midvein; stigmas 2. 



In swamps, British Columbia to California; rare. 



Carex kelloggii Boott. Stems tufted, slender, 15-40 cm. tall, erect; 

 leaves numerous, flat, 2-3 mm. wide, commonly as long as the stem, some- 

 times longer; spikes 4-15, the bracts commonly exceeding the stem; staminate 

 spike usually single, slender, purplish; pistillate spikes 3-many, mostly 

 sessile or nearly so, greenish, dense, 2-4 cm. long, 3 mm. thick; perigynia 

 ovate, plane, promptly deciduous, 2 mm. long, smooth, flattened, 3-or4-nerved 

 on the outer face, stipitate at the base, short-beaked, the beak emarginate; 

 scales green with purple margins, obtusish, shorter than the perigynia. 



On wet stream banks and lake shores, common. 



Carex lenticularis Michx. Glabrous, tufted; stems erect, 30-60 cm. high; 

 leaves 1-3 mm. wide, equalling or exceeding the stems; lower bract sheathing, 

 exceeding the spikes; spikes 3-8, narrowly cylindric, 1^-4 cm. long, erect, close 

 together, sessile or the lower short-peduncled; perigynia ovate, minutely 

 granulate, faintly nerved, pale green or the nerves brownish, each with a very 

 short entire beak; scales obtuse, green with broad hyaline margins, much 

 shorter than the perigynia. 



Rare in our limits. 



Carex hindsii Clarke. Very similar to C. kelloggii; pistillate spikes 3 or 4, 

 stouter, 1-3 cm. long, 5 mm. thick; perigynia pale green, lanceolate, stipitate, 

 curved and spreading, smooth, 7-nerved on the back, 5-nerved on the anterior 

 face, flat and empty above, the short beak entire, 3 mm. long; scales obtuse, 

 purple with the midrib and margin pale. 



Along the ocean coast, Vancouver Island to Oregon. First found at the 

 mouth of the Columbia River by Hinds. 



95. CYPERUS. 



Annual or perennial; stems simple, 3-angled, leafy near the 

 base, and with one or more leaves at the summit which form an 

 involucre for the simple or compound umbellate or capitate 

 inflorescence; rays of the umbel sheathed at the base, usually 

 very unequal, one or more of the heads or spikes commonly 

 sessile; spikelets flat or roundish, few to many-flowered; scales 

 concave, 2-ranked, all but the lower one flower-bearing; flowers 

 perfect; perianth none; stamens 1-3; akene lenticular or 3-angled. 



Rachis wingless; scale tipped with a recurved awn. C. inflexus. 



Rachis winged; scale merely mucronate. C. erythrorhizos. 



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