MARIBCUS. CLX. CYPERACE^E. 567 



* * Spikelets irregularly inserted all around the rachis. 



9. C. ScHWEiNiTZIi. Torr. Scheinitz's Sedge. 



St. 8 12' high, triquetrous, rough on the angles ; Im. shorter than the 

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

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

 brous on the margin ; spikelets 6 7, alternate, approximate, 6 8-flowered, with 

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

 margin ; sta. 3 ; sty. 3-cleft, scarcely longer than the smooth achenia. Shore 

 of L. Ontario, Sartwell, of Lake Erie, Suttivant ! to Ark. 



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



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

 pound ; rays 5 9, 3 M long, each with 34 sessile spikes ; sheaths entire ; 

 spikelets 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 ; 

 sta. 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 ; 

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

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

 heads ; glumes 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 \" wide ; umbel 4 6-rayed, capillary, erect, spread- 

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

 8 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 10-rayed ; invol. of 3 unequal leaves, 

 one of them longer than the umbel ; spikelets 3 on each peduncle, 3 1" 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; l-vs. equaling the stem; umbel 

 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' Torr.) high, slender, obtusely triquetrous; Ivs. erect, 

 radical, as long as the stem ; umbel 16 (1 2 TVrr.)-rayed ; invol. 3 4-leaved, 

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

 lets 3 11", oblong-linear, obtuse, 15 25-flowered ; fls. very regularly imbri- 

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

 ish. 111. Mead! Mo. Drummond. 



3. MARISCUS. Vahl. 



Celtic 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 ; rachis margined with the adnate, persistent, in- 



48* 



