184 



CYPEKACEAE (SEDGE FAMILY) 



254. E. Torreyana 

 Spikelet x 2. 

 Achene x 10. 



255, 



K. nielanocarpa. 

 Spikelet x 2. 

 Achene x 10. 



256. E. albifla 

 Spikelet x 2. 

 Achene x 10. 



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

 bristles. — Wet pine-barrens, etc.!^ Ct. to Fla. Fig. 254. 



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

 culms flattened, gi'ooved, wiry, erect (2.5-7 dm. high), the clo.se 

 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 scarioiis margins; achene glossy, obo- 

 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 blacki.sh. — \\-eX sand, Mass. to Fla. ; 

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

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



1*.). 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, whitish to light brovjn, with narrow scari- 

 oiis margin ; achenes smooth, not glossy, trigonous- 

 l)yriform, 1 mm. long, contracted belovj the conic- 

 deltoid pale tubercle, and usually exceeded by the 

 reddish bristles. — Damp chiefly brackish soil, Md. 

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



20. E. tricostata Torr. Eootstock stout and 

 tough ; culms flattish (2-6 dm. high) ; spikelet soon 

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

 scales ovate, very obtuse, rusty brown, with broad 

 scarious margins ; achene obovoid, wAth 3 prominent 

 angles, minutely rough-wrinkled, crotvned vnth a 

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



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

 rootstocks, A-angular (0.5-7 dm. high), ihe sides concave ; spike- 

 let ellipsoidal, acntish, 20-SO-flowe7'ed (3-10 mm. long) ; scales 

 ovate, obtuse, chestnut-purple, with a broad 

 scarious margin and green keel, the outer 2 or 

 3 mm. long; achene plump, obovoid, roughish- 

 vninkled, 1-1.3 mm. long, crowned vnth a small 

 depressed tubercle, persistent after the fall of 

 the scales ; bristles \ as long as the achene or 

 none. — Nfd. to Man., and southw. June-Aug. 

 Fig. 258. 



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

 rootstock generally .stouter and stiffer ; culms 

 flat, striate, tufted, u.sually coarser ; scales 

 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, striate, 2-8 cm. high ; 

 acutish, 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-straw-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. 

 Macoun). Early .June. Fi<;. 2(J0. 



24. E. intermedia (Mulil.) Scliulics. O/Zz/js rapil/ary, striate-grooved, 

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



257. E. tricostata. 

 Spikelet x 2. 

 Achene x 10. 



258. ii. tefluis. 

 Spikelet x 2. 

 Achene x 10. 

 Cross-section of 

 culm X 5. 



259. E. acuminata. 

 Spikelet x 2. 

 Achene x 10. 

 Cross-section of 

 culm X 5. 



spikelet ovoid. 



260. E. nitida. 

 Spikelet X 2. 

 Achene x 10. 



