39 



CYPERACEAE. 



VOL. I. 



8g. Carex rupestris All. Rock Sedge. Fig. 956. 



Carex rupestris All. Fl. Fed. 2 : 264. pi. '92. f. i. 1785. 



Carex Drummondiana Dewey, Am. Journ. Sci. 29: 251. 

 1836. 



Culms slender, obtusely 3-angled, erect, i'-6' tall. 

 Leaves i"-i" wide, involute in drying, often curved, 

 shorter than or exceeding the culm; bract wanting; 

 spike solitary, androgynous, slender, 6"-i2" long, the 

 pistillate part loosely few-flowered; perigynia erect, 

 smooth, oblong-obovoid, triangular, long-stipitate, 

 firm, faintly nerved, ii"-2" long, abruptly very short- 

 beaked, the beak truncate; scales purple-brown, 

 ovate, obtuse or subacute, wider and longer than the 

 perigynia ; stigmas 3. 



Quebec and Greenland to British Columbia, south in 

 the Rocky Mountains to Colorado. Also in northern 

 Europe and Asia. Summer. 



90. Carex filifolia Nutt. Thread-leaved Sedge. Fig. 957. 



Carex filifolia Nutt. Gen. 2: 204. 1818. 



Densely tufted, pale green and glabrous, culms slen- 

 der but wiry, smooth, erect, 3'- 14' tall, equalling or 

 longer than the leaves. Leaves filiform, rather stiff, 

 scarcely i" wide, their sheaths persistent and ultimately 

 fibrillose ; spike solitary, erect, bractless, androgynous, 

 3"~I5" long, the pistillate part about 2" in diameter; 

 perigynia 5-10, ovoid-oval, obtusely triangular, nearly 

 nerveless, closely enveloping achene, puberulent at least 

 above middle, li" long, rather more than ' thick, 

 tipped by a short cylindric hyaline entire beak; scales 

 very broad and enveloping perigynia, concave with 

 wide white scarious margins, obtuse or cuspidate, 

 about as long as the perigynia; stigmas 3. 



In dry soil, Manitoba to British Columbia, south to 

 Kansas, Colorado and California. May-July. 



91. Carex scirpoidea Michx. Scirpus-like Sedge. Fig. 958. 



Carex scirpoidea Michx. Fl. Bor. Am. 2: 171. 1803. 



Dioecious, foliage glabrous, rather bright green, 

 culms from elongated rootstocks, aphyllopodic, erect, 

 slender but stiff, 6'-i8' tall. Leaves \"-\" wide, nearly 

 erect, usually much shorter than the culm ; spike soli- 

 tary or rarely with an additional and very small one 

 near its base, linear-cylindric, densely many-flowered, 

 8"-is" long, \\"2\" in diameter, subtended by a short 

 or sometimes subulate bract ; perigynia numerous, oval, 

 two-nerved, obscurely triangular, densely pubescent, 

 li" long, i" thick, narrowed at the base, tipped with a 

 very short entire or at length slightly bidentate beak ; 

 scales oblong-obovate, dark purple with a narrow green 

 midvein', ciliate, obtusish, nearly as long as the peri- 

 gynia. 



In rocky soil, Greenland to Alaska, south to the higher 

 mountains of New England, Lake Huron and British Co- 

 lumbia. Also in northern Europe. Summer. 



