22 CYPERACEAE. 



spikelets linear, subterete, 10-20-flowered, 16-25 mm. long, about 2 mm. thick: 

 scales ovate-oblong, appressed, imbricate, obtuse, rather firm, green and 7-9- 

 nerved on the back, yellowish on the sides: rachis broadly winged: achenes 

 narrowly obovoid, obtuse, about 1-1.5 mm. long. — Hammocks, U. keys, L. keys. 

 — (Ber., Bah., Cu'ba, Ant.) 



r^ 7. C. Martindalei Britton. Perennial, 2-7 dm. tall: leaves overtopped by the 

 scape; blades filiform by the revolute margins, smooth: umbel capitate, or 

 with 1-3 slender rays: spikes globular, 1-2 cm. in diameter: spikelets linear or 

 linear-subulate, 6-10 mm. long, yellowish-green, densely crowded: scales 

 broadly oblong, 2-2.5 mm. long, prominently ribbed: achenes oblong, 2 mm. 

 long or nearly so, brown, dull. — Sandy places. Key West. — [E, K.] 



j6 8. C. litoreus (Clarke) Britton. Perennial, light-green: leaves overtopped by 

 the scape; blades narrowly linear, glabrous: scapes sparingly tufted, 5 dm. 

 tall or less, smooth: bracts of the involucre usually 5, about as wide as the 

 leaves: umbel simple, with about 5 slender unequal rays: spikes subglobose, 

 1-2 cm. in diameter: spikelets narrowly linear, 9-12 mm. long, greenish, rather 

 lax: scales ovate or oblong-ovate, 2-2.5 mm. long, ribbed, mucronate, lax: 

 achenes linear-oblong, 1.5 mm. long, pale-brown.- — Hammocks, Long Key. 



^19. C. fuligineus Chapm. Perennial, 1-4 dm. tall: leaves overtopped by the 

 scape; sheaths blackish; blades revolute, about as slender as the scape, smooth: 

 spikelets crowded in a head about 1 cm. in diameter, linear-oblong, 4-7 mm. 

 long, dark-brown, 8-12-flowered, often apparently lateral: scales oval or ovate, 

 barely 2 mm. long, mucronulate, several-ribbed: achenes oblong-obovoid, barely 

 1.5 mm. long, dark-brown, dull. — Hammocks and sandy places. Key West. — 

 {Bah., Cuba, Curasao.) 



c',10. C. Blodgettii Torr. Perennial, 1-3 dm. tall: leaves overtopped by the 

 ^scapes; blades 2-4 mm. wide, smooth: umbel capitate or with one to three 

 short rays: spikes 10-15 mm. in diameter: spikelets 20-40, oblong or linear- 

 oblong, 6-8 mm. long, densely crowded, 1-10-flowered: scales oval to ovate, 

 less than 2 mm. long, mostly 9-nerved, rather obtuse: achenes oblong, about 

 1 mm. long, brown, dull. — Hammocks and sandy places, Key West. 



i'^ 11. C. ligularis L. Perennial, 5-12 dm. tall : leaves sometimes overtopping 

 the scape; sheath colored at the base; blades 6-20 mm. broad, serrulate, 

 somewhat revolute: umbel compound, of 6-many short rays, often rather 

 dense, or the rays rarely elongate: spikes cylindric or oblong, 1-2 cm. long: 

 spikelets 4-6 mm. long, gray to brown, densely crowded, spreading: scales 

 oval, 2.5-3 mm. long, blunt, closely imbricate, delicately ribbed: achenes 

 elliptic or slightly broadest above the middle, 1.5 mm. long, dark-brown, dull. 

 — Hammocks and sand-dunes, U. keys, L, keys. — [E. K.] — (Bah., Cuha, Ant.) 



12. C. bnmneus Sw. Perennial, 3-7 dm. tall : leaves overtopped by the scape ; 

 '^'blades 2-7 mm. wide, smooth, sometimes involute: umbel compound, capitate, 

 or 3-5 of the rays becoming 1-7 cm. long: spikelets linear or linear-lanceolate, 

 10-15 mm. long, chestnut-colored, densely crowded: scales oval or ovate-oval, 

 nearly 3 mm. long, often apiculate, conspicuously ribbed: achenes elliptic- 

 obovoid, fully 1.5 mm. long, dark-brown. [C. Ottonis Boeckl.] — Coastal sand- 

 dunes and hammocks, U. S. keys, U. keys, L. keys, L.- S. keys.— [E. K.] — {Ber., 

 Bah., Cuba. Ant.) 



2. ELEOCHAKIS E. Br. Scapose herbs. Leaves reduced to sheaths or 

 the lowest very rarely blade-bearing. Scapes simple. Spikelets solitary, 

 terminal, erect, several-many-flowered, not involucrate or rarely with 2 small 

 subtending bracts. Scales spiral. Perianth of 1-12 bristles, usually retrorsely 

 barbed, or wanting. Base of the style persistent on the achene as a tubercle. 

 — Spike-rush. 



