44 CYPEEACEAE. 



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

 stout, striate: spikelet conic-cylindric, 1O-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. Bather rare, in wet sandy 

 places. Sum. 



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

 tall: spikelet cylindric, 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, obscurely 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, \ 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, 

 610 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, schists. 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. FIMBEISTYLIS 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. 



