CYPERACEAE (SEDGE FAMILY) 



185 



long); sheaths with oblique tips; spikeht cylindrir^ovoid, acu- 

 tish, loosely b-20-floirered (2-7 mm. long); scales oblong, obtuse, 

 green-keeled, the sides purplish-brown ; achene 

 obovoid with a narrowed base, beaked with 

 a slender conical-awl-shaped tubercle, which 

 nearly equals the 6 bristles. — Wet places, 

 Gasp^ Co., Que., to w. ()nt.. s. to n. Me., 

 w. Ct., N. J., Pa., 0., and la. Fig. 261. 

 Var. Habereri Fernald. Bristles absent or 

 rudimentary. — Shores of Oneida L., N. Y. 

 {J. V. Haherer). 



25. E. Macounii Fernald. Annual ; culms 

 weak, 2 or 2.5 dm. long ; spikelet lance-ellip- 

 soid, 1 cm. long, densely flowered ; scales 

 ovate-lanceolate, acutish or blunt, dark hrovni ; 

 compressed^ trigonous-obovoid, twice as long 

 deltoid-conical tubercle. — Border of marsh, 

 North Waketield, Que. (J. 31. JIaconn). Fig. 262. 



26. E. rostellata Torr. Perennial, from short thick 

 caud'x; culms flattened and striate -grooved^ wiry, erect (8-12 

 dm. long), the sterile ones reclining, rooting and proliferous 

 from the apex, the sheath transversely truncate ; spikelet 

 spindle-shaped, 12-20-flowered, 6-15 mm. long; scales ovate, 

 obtuse (light brown); achene obovo id-triangular, narrowed 

 into the confluent pyramidal tubercle, which is overtopped 

 by the 4-6 bristles. — Salt marshes, N. H. to Fla., and locally 

 in alkaline situations inland. (Mex., Cuba.) Fig. 263. 



262. E. Macouuii. 

 Spikelet x 2. 

 Achene x 10. 



achene much 

 as the broad 



261. E. intermedifc. 

 Spikelet x 2. 

 Achene x 10. 



263. E. rostellata. 

 Spikelet x 2. 

 Achene x 10. 



5. DICHROMENA ^[ichx. 



Spikelets few-flowered, all but 3 or 4 of the flowers usually imperfect or 

 abortive. Scales imbricated soniewhat in 2 ranks, more or less conduplicate or 



boat-shaped, keeled, white or whitish. Stamens 3. Style 

 2-cleft. Perianth, bristles, etc., none. Achene lenticular, 

 wrinkled transversely, crowned with the persistent and broad 

 tubercled base of the style. — Culms leafy, from creeping 

 perennial rootstocks ; the leaves of the involucre mostly white 

 at the base (whence the name, from 5ls, 

 double, and xP'-^f^c-i color). 



1. D. colorata (L.) Hitchc. Culm 

 triangular (0.25-1 m. high) ; leaves nar- 

 row; those of the involucre 4-7, linear; 

 achene truncate, not margined. (Z>. leuco- 

 cephala Michx.) — Damp pine-barrens, 

 N. J. to Fla. and Tex. ; very rare northw. July-Sept. (Mex., 

 W. I.) Fig. 264. 



2, D. latifblia Baldw. Culm stouter, nearly terete; 

 leaves broadly linear ; those of the involucre linear-lance- 

 olate, 8 or 9, tapering from base to apex; achene round- 

 obovoid, faintly wrinkled, the tubercle decurrent on its 

 edges. — Low pine-barrens, Va. to Fla. and Tex. Fig. 265. 



264. D. colorata. 



265. D. latifolia. 



6. PSILOcIrYA Torr. Bald Rush 



Spikelets ovoid, terete, the numerous scales all alike and regularly imbri- 

 cated, each with a perfect flower. Stamens mostly 2. Style 2-cleft, its base 

 enlargins: and hardening to form the beak of the lenticular or tumid more oi 

 less wrinkled achene. — Annuals, with leafy culms, the spikelets in terminal and 

 axillary cymes. (Name from rpiXos, naked, and Kapvou, nut.) 



