CYPERACEAE (SEDGE FAMILY) 



185 



long); sheaths with oblique tips; spikelet cylindric-ovoid, acu- 

 tish, loosely 5-20 -flowered (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, 

 Gaspe" Co., Que., to w. Ont., s. to n. Me., 

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

 Var. HABER^RI Fernald. Bristles absent or 

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

 (J. V. Haberer). 



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 brown ; 

 achene much compressed, trigonous-obovoid, twice as long 

 as the broad deltoid-conical tubercle. Border of marsh, 

 North Wakefield, Que. (J. M. Macoun). FIG. 262. 



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

 caudpx ; culms flattened and striate-grooved, wiry, erect (3-12 

 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 obovoid-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. Macounii 

 Spikelet x 2. 

 Achene X 10. 



261. E. intermedia. 

 Spikelet x 2. 

 Achene x 10. 



E. rostellata. 



Spikelet x 2. 

 Achene x 10. 



5. DICHR6MENA Michx. 



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



abortive. Scales imbricated somewhat 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 8s, 

 double, and xp^^t 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 north w. 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. I), latifolia. 



6. PSILOCARYA 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 

 enlarging and hardening to form the beak of the lenticular or tumid more 01 

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

 axillary cymes. (Name from ^i\6s., naked, and Kdpvov, nut.} 



