44 CYPEEACEAE. 



3. E. palustris (L.) E. & S. Perennial. Scapes not tufted, 3-15 dm. tall, 

 stout, striate: spikelet conic-eylindric, 10-25 mm. long, thicker than the scape, 

 acute: scales ovate-oblong, reddish-brown, except the whitish margin and the 

 greenish midvein, or pale-green: perianth-bristles usually 4, much longer than 

 the achene, downwardly barbed, or wanting: achenes obovoid, lenticular, about 2 

 mm. long, yellowish, about twice as long as the ovate tubercle. — Susquehanna 

 valley. Frequent, on the river shore and low islands. — Sum. 



4. E. glaucescens (Willd.) Schult. Perennial. Scapes tufted, slender, 1-9 dm. 

 long, bright- or deep-green: spikelet oblong or oblong-lanceolate, 0.5-1.5 cm. 

 long, acute or rather obtuse: scales brown or dark-green, blunt, or acute in age: 

 perianth-bristles usually 4, about as long as the achene or shorter, or nearly 

 wanting: achenes lenticular, obovoid, about 1.5 mm. long, excluding the narrow 

 conic tubercle, brown. — Lower Susquehanna valley. Eather rare, in wet sandy 

 places. — Sum. 



5. E. Smallii Britton. Perennial. Scapes slightly tufted, rather stout, 4-7 dm. 

 tall: spikelet cyliudric, about 1.5 cm. long, about as thick as the scape, acute: 

 scales oblong-lanceolate, acuminate: perianth-bristles usually 4, downwardly 

 barbed, about as long as the achene, including the tubercle: achenes obovoid, 

 lenticular, about 1.5 mm. long^ dark-brown; tubercle bulb-like, one fourth as 

 long as the achene-body and about one half as wide, constricted at the base. — 

 Susquehanna valley. Frequent, in shallow water about sandy islands and shores. 

 — Sum. and fall. 



6. E. acicularis (L.) E. & S. Perennial. Scapes tufted, filiform, capillary, 

 or setaceous, obscurel.y 4-angled and grooved, 5-20 cm. long: spikelet com- 

 pressed, narrowly ovate or linear-oblong, acute, 3-10-flowered, 3-10 mm. long, 

 1 mm. wide: scales thin, obtuse, or the upper acutish, pale-green, usually with a 

 narrow brown line on each side of the midvein: perianth-bristles 3-4, fugacious, 

 shorter than the achene: achenes obovoid-oblong, 0.5 mm. long, pale, 3-angled 

 with a rib on each angle and 6-9 lower facial ribs connected by the fine ridges; 

 tubercle conic, acute, i as long as the achene-body. — Eather rare, in swamps 

 and low grassy places. — Sum. 



7. E. tenuis (Willd.) Schult. Perennial by rootstocks. Scapes tufted, filiform, 

 mostly erect, 4-angled, 2-4 dm. tall: spikelet oblong, acutish, many-flowered, 

 6—10 mm. long, about 2 mm. in diameter: scales thin, obtuse, chestnut-purple, 

 except the greenish midvein, the margins scarious: perianth-bristles 2-4, shorter 

 than the achene, fugacious, or wanting: achenes obovoid, about 1 mm. long, 

 obtusely 3-angled, yellow to brown, irregularly ridged-reticulate or papillose, 

 more or less persistent on the rachis of the spikelet after the scales have fallen; 

 tubercle depressed-conic. — M. S. Eather rare, in swamps or low grounds. — 

 Limestones, scliists. — Sum. 



8. E. intermedia (Muhl.) Schult. Annual. Scapes very slender, densely 

 tufted, diffusely spreading and partially decumbent, 1-4 dm. long: spikelet 

 ovoid-oblong, acutish, 8-20-flowered, 3-7 mm. long: scales purple-brown, except 

 the greenish midvein, tardily deciduous: perianth-bristles 6, longer than the 

 achene, downwardly barbed, persistent: achenes obovoid, fully 1 mm. long, 

 3-angled, light-brown, finally reticulate, fully twice as long as the conic-subulate, 

 tubercle. — M. S. Eare, in the Dillerville swamp and near Quarryville. — Sum. 



6. FIMBRISTYLIS Vahl. Annual or perennial scapose herbs. Spikeleta 

 umbellate or capitate, several-many-flowered, terete, involucrate. Scales spirally 

 imbricate, mostly deciduous, all flower-bearing. Perianth wanting. Stamens 

 1-3. Style pubescent or glabrous, with its base dilated or swollen, wholly 

 deciduous at maturity. Stigmas 2-3. Achenes lenticular, or 2-angled, reticu- 

 late, cancellate. striate or ribbed. — Fall. 



