184 



CVl'EKACEAE (SEDGE FAMILY) 



254. E. Torreyana. 

 Spikelet x 2. 

 Achene x 10. 



255. E. melanocarpa. 

 Spikelet x 2. 

 Achene x 10. 



Spikelet x 2. 

 Achene x 10. 



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

 bristles. Wet pine-barrens, etc., Ct. to Fla. FIG. 254. 



1 8. E. melanocarpa Torr. Tufted, 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, obo- 

 void-top-sltftjKil, 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, whitish to light brown, with 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 

 reddish bristles. Damp chiefly brackish soil, Md. 

 to Fla., etc. (Mex., W. I.) FIG. 25(5. 



20. E. tricostata Torr. Rootstock stout and 

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

 cylindrical, densely many-flowered '((>-! 8 mm. long) ; 

 l ' scales ovate, very obtuse, rusty brown, with broad 



scarious margins ; achene obovoid, with 3 prominent 257 - E - tricostata - 

 angles, minutely rough-wrinkled, crowned with a 

 short-conical acute tubercle ; bristlesnone. N. Y. to Fla. FIG. 257. 



21. E. te"nuis (Willd.) Sclmltes. Culms almost capillary, erect from running 

 rootstocks, ^-angular (0.5-7 dm. high), the sides concave ; 

 let ellipsoidal, acutish, 20-BQ-flowered (3-10 mm. long) ; 

 ovate, obtuse, chestnut-purple, with a broad 

 scarious margin and green keel, the outer 2 or 

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

 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. Nfd. to Man~, and southw. June-Aug. 

 FIG. 258. 



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

 rootstock generally stouter and stiffer ; culms 

 flat, striate, tufted, usually coarser ; scales 

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

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

 Ont., southw. FIG. 250. Perhaps a variety of the last. 



E. nitida Fernald. Perennial, from slender rootstock ; 



culms capillary, 4-angled, striate, 2-8 cm. high; spikelet ovoid. 

 acutish, 2. 5-4. 5 mm. long, 1.6-2.5 mm. thick, 8-20-flowered ; >///. s 

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

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

 I'Di.g ; achenes whitish-straw-color, narrowly obovoid, shitr/>l>/ 

 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. 

 Mocnnn}. Early June. FIG. 260. 

 24. E. intermedia (Muhl.) Srlmltes. Culms r, //*///,////. striato-grooved, 

 densely tufted from fibrous roots, diffusely spreading or reclining (0.2-1 dm. 



Spikelet x 2. 

 Aclii'ne x 10. 



258. E. teuuis. 

 Spikelet x 2. 

 Achene x 10. 

 Cross-section of 

 culm x 5. 



259. E. aouininnta. 



Spikelet x 2. 



Achene x 10. 



Cross-section of 



culm x .">. 



K. nitida. 

 Spik.-lot x2. 

 Achene x 10. 



