362 



CYPERACEAE. 



Vol. I. 



5. Carex chordorrhiza Ehrh. Creeping Sedge. Fig. 872. 



Carex chordorrhiza Ehrh. in L. f. Suppl. 414. 1781. 



Culms elongated, the old ones prostrate, sending up 

 from apical nodes (usually) fertile culms and from 

 lower nodes sterile culms, the latter in succeeding 

 seasons becoming prostrate and sending forth new 

 culms from the nodes, the roots little developed. Fertile 

 culms erect, smooth, 4-18' tall; leaves i"-il" wide, 

 shorter than the culm, somewhat involute in drying, 

 straight, the lower ones reduced to short sheaths ; spikes 

 2-;4, bractless, androgynous, aggregated into a terminal 

 ovoid or oblong head 3"-6" long; perigynia broadly 

 ovoid, i" long, 1" wide, flat on the inner side, convex 

 on the outer, very thick, strongly many-nerved, slightly 

 margined, abruptly tipped by a very short entire beak; 

 scales ovate or ovate-lanceolate, brown, acute or acumi- 

 nate, equalling the perigynia or a little longer ; stigmas 2. 



In sphagnum bogs and shallow water, Anticosti to Hudson 

 Bay and the Northwest Territory, south to Maine, New 

 York, northern Pennsylvania, Illinois and Iowa. Also in 

 Europe and Asia. Summer. 



6. Carex stenophylla Wahl. Involute-leaved 

 Sedge. Fig. 873. 



Carex stenophylla Wahl. Kongl. Vet. Acad. Handl. (II.) 



24: 142. 1803. 

 ?C. Eleocharis Bailey, Mem. Torr. Club 1 : 6. 1889. 



Culms in small tufts from long creeping rootstocks, 

 pale green, smooth, stiff, erect, 3'-8' high. Leaves 

 involute, about i" wide, shorter than to exceeding the 

 culm; spikes 5 or 6, androgynous, sessile and aggre- 

 gated into an ovoid dense head 3i"-7$" long, 5" wide 

 or less, appearing like a solitary spike; perigynia 

 ovate or ovate-oval, about ii" long and i" wide, 

 slightly margined above, faintly several-nerved, 

 plano-convex, gradually narrowed into a short ser- 

 rulate beak, the orifice oblique or in age slightly 

 bidentate; scales ovate, brownish, membranous, ob- 

 tuse to cuspidate, about equalling the perigynia; 

 stigmas 2. 



In dry soil, Manitoba to British Columbia, south to 

 Iowa, Kansas and Colorado. Also in Europe and Asia. 

 June-Aug. 



7. Carex camporum Mackenzie. Clustered Field Sedge. Fig. 874. 



C. marcida Boott ; Hook. Fl. Bor. Am. 2 : 212. pi. 213. 1840. 



Not J. F. Gmel. 1791. 

 Carex camporum Mackenzie, Bull. Torr. Club 37 : 244. 1910. 



Light green, culms slender, sharply 3-angled, smooth- 

 ish, or rough at least above, i°-2° tall, from long creep- 

 ing rootstocks. Leaves $"-2" wide, flat or nearly so, 

 much shorter than the culm; bracts short, subulate 

 from a broader base, or wanting; spikes several, 

 androgynous or gynaecandrous, clustered in a terminal 

 linear-oblong to ovoid-oblong head 6"-i8" long, 3"-s" 

 wide, the lower ones rarely compound ; perigynia ovate, 

 dark brown at maturity, ii"-2" long, faintly nerved, 

 sharp-margined, tapering into a flat serrate beak shorter 

 than the body ; scales ovate or ovate-lanceolate, brown- 

 ish, hyaline-margined, acute or cuspidate, usually ex- 

 ceeding the perigynia; stigmas 2. 



In dry soil, Michigan to British Columbia, south to 

 Nebraska, Kansas, New Mexico and Nevada. Rarely ad- 

 ventive eastward. June-Sept. 



