CYPERACEAE (SEDGE FAMILY) 



185 



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

 tish, loosely 6-20-flowered (2-7 mm. long); scales oblong, obtuse, 

 green-keeled, the sides purplish-brown ; aohene 

 obovoid with a narrowed base, beaked with 

 a slender conical-awl-shaped tubercle, which 

 nearly equals the 6 bristles. — Wet places, 

 GaspiS Co., Que., to w. Ont., s. to n. Me., 

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

 Var. HABEEiiKi Fernald. Bristles absent or 

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

 ((/■. V. Haberer). 



26. 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). Fio. 262. 



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

 caudex; 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. 



!62. E. Macounii. 

 Spikelet X 2. 

 Achene X 10. 



261. E. intermedia. 

 Spilcelet X 2. 

 Achene x 10, 



E. rostellata. 

 Spikelet X 2. 

 Achene X 10. 



8. DICHr6mENA Miohx. 



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

 abortive. Scales imbricated somewhaf 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 dls, 

 double, and xp^l^"-: color). 



1. D. color^ta (L.) Hitchc. Culm 

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

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

 aohene 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 deourrent on its 



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



D. colorata. 



265. D. 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 oi 

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

 axillary cymes, (Name froip i/'iX6?. n,aked, and Kipvov^ nut.) 



