Mariscus. OLX. CYPERACEiE. 567 



* * ffpikekls irregularly inserted all around the rachu. 



9. C. ScHWEtNiTZii. ToiT. Scheinitz^s Sedge. 



St: S — 12' high, triquetrous, rough on the angles; J,vs. shorter than the 

 stem, about a line wide 5 umbel simple, erect, 4 — 6-rayed, rays elongated, une- 

 qual ; sheaths truncate, entire ; invol. 3 — 5-leaved, longer than the leaves, sca- 

 ferous on the margin; spikclets 6 — 7, alternate, approximate, C — 8-llowered, with 

 a small, setaceous bract at the base of each ; scales membranaceous on the 

 jnargin ; sta. 3 ; sty. 3-cIeft, scarcely longer than the- smooth achenia. — Shore 

 of L. Ontario, SarVwell, of Lake Erie, Sidlivant! to Ark. 



10. C. ERUTHRORHlzos. Muhl. Red-Toot Sedge. 



St. 2 — 3f high, obtusely triquetrous, longer than the leaves ; umbel com- 

 pound; rai/s 5 — 9, 3 — 4' long, each with 3—4 sessile spikes; sheaths entire; 

 spikelcts very numerous, 6" long, crowded and spreading in the spikes, a little 

 flattened, about 13-flowered; outer glumes mucronate, closely imbricated, chest- 

 nut-brown, veinless and shining, the inner ones entirely free from the rachis ; 

 ste. 3 ; ach. smooth and shining, much shorter than the glume. — Wet grounds, 

 Penn. and Southern States. 



* * * Spikelets more or less aggregated in terminal masses. 



11. C. FiLicuLMis. Vahl. (C. mariscoides. Ell.) 



St. slender, almost filiform, tuberous at base, 8 — 12' long, leafy only at base ; 

 fos. mostly radical, carinate ; umiel simple and sessile, or with 1 or 2 rays ; spike- 

 lets linear-lanceolate, 3 — 8-flowered, flattened when old, collected into globose 

 heads ; flumes remote, loose, ovate, yellowish. — Dry, rocky hills, N. Eng. ! to 

 Flor., W. to 111. ! Aug. 



12. C. Grayii. Torr. 



St. 8 — 12' high, filiform, obtusely triangular, erect, tuberous at base ; Ivs. 

 radical, channeled, about J" wide ; umbel 4— 6-ray€d, capillary, erect, spread- 

 ing ; sheaths truncate ; hds. loose, of 6 — 8 spikelets ; spikelets linear, compressed, 

 6 — 7-flowered ; scales ovate, veined, obtuse, imbricated, interior ones lanceolate ; 

 sta. 3; sty. 3-cleft; ach. obovate-triquetrous, § the length of the scale, gray, dot- 

 ted. — Sandy fields, Mass., Oakes, L. I., Kneiskern., N. J., Torrey. Sept. {Dr. 

 Sartwell comm.) 



13. C DENTATUs. Torr. 



St. about If high, leafy at base, triquetrous; Ivs. a little shorter than the 

 stem, strongly keeled; umbel compound, 6— lO-rayed; invol. of 3 unequal leaves, 

 one of them longer than the umbel ; spikelets 3 on each peduncle, 3 — 7" long, 

 ovate, flat, 8-flowered ; glumes acute, spreading at the points, giving the spike- 

 lets a serrated appearance ; sty. 3-cleft ; ach. triangular. — % Swamps, N. Eng, ! 

 and Middle States. 



14. C. iNFLExus, Muhl. 



St. setaceous, leafy at base, 2 — 3' high ; Ivs. equaling the stem ; uvibel 

 ■2 3-rayed, or conglomerate and simple ; invol. of 3 long leaves ; spikelets ob- 

 long, 8-— 12-flowered, 10 — 20 together, densely crowded into the ovoid heads; 

 glumes yellowish, veined, squarrose-uncinate at tip- sta. 1. — Banks of streams. 

 Free States! and British Provinces. Aug., Sept. 



15. C. AcuMiNATus. Torr. & Hook, 



St. 5 — 10' (3 — 4' TwT.) high, slender, obtusely triquetrous; Ivs. erect, 

 radical, as long as the stem; umbel 1 — 6 (1 — 2 Tiyrr.)-rayed; invol. 3 — 4-leaved, 

 very long; rays unequal, each with a globose head of 15 — 40 spikelets; spike- 

 lets' Z 11", oblong-linear, obtuse, 15 — 25-flowered ; /5. very regularly imbri- 

 cated in 2 rows ; glumes acute, with the point recurved ; sta. 1 ; ach. dull-gray- 

 ish. — IlL Mead! "Mo. Drummond. 



3. MARISCUS. Vahl. 

 Cedtic mar, a marsh ; alluding to the place where some species grow. 



Spikelets subterete, clustered in heads, rarely with but 1 or 2 fer- 

 tile flowers ; glumes imbricated somewhat in 2 rows, the lower ones 

 short and empty ; raehis margined with the adnate, persistent, is- 



