181 



CYPERACEAE (^SEDGE FAMILY^ 



254. E. Torreyaua. 

 Spikelet x 2. 

 Acheiie x 10. 



255. E. melanocarpa. 

 Spikelet X 2, 

 Achene x 10. 



conical tubercle, which is hardly equaled by the 3-6 slendei 

 bristles. — Wet piiie-barrens, etc., Ct. to Fla. Fio. 254. 



18. E. melanocarpa Torr. Tutted, from a short thick caudex ; 

 culms flattened, grooved, wiry, erect (2.5-7 dm. high), the close 

 basal sheaths with truncate mucronate tips; 

 spikelet cylindrical-ovoid, thick, obtuse, 

 densely many-flowered (7-15 mm. long) ; 

 scales closely many-ranked, roundish-ovate, very obtuse, 

 brownish, with broad scarious margins; achene glossy, ob<>- 

 void-top-shaped, obtusely triangular, the broad summit entirely 

 covered by the flat depressed tubercle, which is raised in the 

 center into a short abrupt triangular point ; bristles often 

 obsolete; achene soon blackish. — Wet sand, Mass. to Fla. ; 

 also n. Ind., where the culms are sometimes proliferous at 

 tip {Hill). (Bermuda.) Fig. 255. 



11). E. albida Torr. Tufted, from a slender creeping 

 base; culms slender, wiry, striate, 1-4 dm. high, the basal 



sheaths with very oblique tips; spikelet cylindric-ovoid. blunt, 4-9 

 mm. long ; scales obtuse, ichitish to light brown, loith narrow scari- 

 ous margin ; achenes smooth, not glossy, trigonous- 

 pyriform, 1 mm. long, contracted below the conic- 

 deltoid pale tubercle, and usually exceeded by the 

 rt^ddish bristles. — Damp chiefly brackish soil, Md. 

 to Fla., etc. (Mex., W. I.) Fig. 256. 



20. E. tricostAta Torr. Rootstock stout and 

 tough ; culms flattish (2-0 dm. high) ; spikelet soon 

 cylindrical, densely many-flowered (6-18 mm. long) ; 

 scales ovate, very obtuse, rusty brown, with broad 

 scarious margins ; achene ob ovoid, with Z prominent 

 angles, mimitely rongii-wrinkled, a'owned with a 

 Hhort-conical acute tubercle ; bristles none. — N. Y. to Fla. Fig. 257. 



21. E. tenuis (Willd.) Schultes. Culms almost capillary, erect from running 

 rootstocks, A-angnlar (0.5-7 dm. higli), \,he sides concave ; spike- 

 let ellipsoidal, acutish, 20-SO-flowc'red (8-10 mm. long) ; scales 

 ovate, obtuse, chestnut-purple, with a broad 

 scarious margin and green keel, the outer 2 or 

 f-^^ ^'•^ 3 ?7i?)i. long; achene plump, obovoid, ronghish- 



if /^^"^i ivrinkled, 1-1.3 mm. long, crowned with a small 

 depressed tubercle, persistent after the fall of 

 the scales ; bristles | as long as the achene or 

 none. — N id. to Man^, and southw. June-xVug. 

 Fig. 258. 



22. E. acuminata (Muhl.) Nees. Similar; 

 rootstock generally stouter and stiffer ; culms 

 flat, striate, tufted, usually coarser ; scales 259. E. acuminata. 

 lance-ovate, the uppermost acute. (E. compressa 

 SuUiv.) — Wet places, oftenest in calcareous soil, N. Y. and 

 Ont., souThw. Fig. 259. — Perhaps a variety of the last. 



23. E. nitida Fernald. Perennial, from slender rootstock ; 

 culms capillary, 4-angled, vStr'ate, 2-8 cm. high ; 

 acuti.'^h, 2.5-4 5 mm. long, 1.5-2.5 mm. thick, 8-20-flowered ; scales 

 elliptic-oblong, with rounded tips, purplish-brown, with greenish 

 ribs and very narrow scarious margins, the lowermost 1-1.2 mm. 

 long; achenes whitish-straiv-color, narrowly obovoid, sharply 

 trigonous, very minutely (under a lens) roughened, 0.7-1 mm. 

 long, the very narrow crown-like tubercle with a short point in 

 the middle. — Springy spots, valley of the Ottawa R., Can. {J. 

 Maconn). Early June. Fig. 2(K). 

 intermedia (Muhl.) Schultes. Culm^ capillary, striate-grooved, 

 densely tufted from fibrous roots, diffusely spreading or reclining (0.2-4 dm. 



257. E. tiicostata. 

 Si)ikelet x 2. 

 Achene x 10. 



258. E. tenuis. 

 Spikelet X 2. 

 Achene x lO. 

 Cross-.section of 

 culm X 5. 



Spikelet x 2. 

 Acheue x 10. 

 Cross-section of 

 culm X 5. 



spikelet ovoid, 



