β. Albi-montana. Perig. ovate-oblong, acuminate of tapering above to a point longer and more convex, and sometimes beginning to curve back wards, with a less obtuse, or short acute glume Variable in length. - Ponds, White Mts. (Oakes, Tuckerman.) Blakei. Intermediate between the two forms preceding; fruit less acute, nearly elliptical. it3 glume obtuse and always shorter.- Harrison, Me. (Rev J. Blake).

55 C. aurea Nutt, Spike short, cylindric, pedunculate; spikes 3, oblong, loose-flowered, subpendulous, exsertly pedunculate, subapproximate, bracteate; perig. globous, obovate or pear form, obtuse, nerved, entire at the mouth, longer than the ovate, acute or short-mucronate glume; st. 3 - 10', slender, often subprocum-bent - Plant glabrous, green. Common in wet grounds, N. Eng, and westward and northward. (C. pyriformis Schw.)

56 C. Mitchelliana Curtis. Spike sometimes with fls. in the middle; spikes 2 or 3, cyliudric, slender, loose-flowered, remotish, pedunculate, and the lowest short-sheathed; perig. ovate, acute, short-rostrate, entire at the orifice, about equaling the ovate, cuspidate glume; culm 15 to 20 high, acutely triquetrous, subscabrous above, leafy towards the base. - Wet places, N. Car. (Curtis).

57 C. torta Boott (I11. 156). Spikes cylindric, slender; spikes 3 or more, very long,, rather loose-flowered, attenuated below, staminate at vertex, upper nearly ses-sile, lower pedunculate and diverging recurved; perig. ovate, convex, terete upwards, often acuminate, recurved, about equaling the narrow-lanceolate, rather obtuse, black glume: culm nearly 2f high, erect, rather slender, triquetrous, but scarcely rough-edged, leafy towards the base; color light green. - Wet places in most of the States. (C. acuta, β. sparsiflora, Ed. 1st.)

58 C. caespitosa. Spike single, oblong, cylindric, sometimes 2, with oblong, black scales; spike 2 - 3, short-cylindric (1' long), erect, obtuse, rather thick, remotish, bracteate, lowest one short-pedunculate; perig. ovate, obtuse, glabrous, entire at the orifice, scarcely rostrate, a little longer than the oblong, obtuse, black glume; st. 6 - 14', scabrous on the edge, leafy towards the base; lvs. flat. - Wet places, Ipswich, Mass. (Oakes) N. Y. and Michigan. (Caespitosa Good. nee. L.)

59 C. aperta Boott. Spikes 1 or 2, cylindric, erect; spikes 2 to 4, oblong cylindric, approximate above, sessile, stam. at apex, lowest somewhat remote and pedunculate; perig. ovate, roundish, short-rostrate, 2-toothed, short-pedicellate, shorter than the lanceolate acute glume; culm 1 to 18', rough-edged above. - Wet meadows, N. Eng. and far westward and northward. (C. acuta β. erecta Dew. Ed. 1st.)

60C. strictiot Dew.Spikes 1 - 2, with oblong and blackish, acutish glumes; spikes 2 - 3, cylindric, above, and hence acutish, lowest short-pedunculate; perig. ovate, compressed, acute, glabrous, entire at the orifice, early falling off glabrous, a little longer than the oblong and acute rusty glume; st. a foot and more, triquetrous and rough on the angles, with reticulated filaments connecting the leaves towards the base; lvs. erect, close; whole plant glaucous except the spikes - Wet places, common. Nearer C. caespitosa than C. stricta.

61 C. stricta Goodon. Spikes 1 - 2, cylindric, lower one sessile, and the scale rusty brown and obtuse; spikes 2 - 3, long-cylindric, upper half , lower longer, short-pedunculale, loosely-flowered below; perig. ovate-acuminate or elliptic, compressed at the orifice entire or slightly cmarginate, and its glume strongly ferruginous, the lower ones acute-lanceolate, the upper linear and obtuse, commonly longer and narrower than the perigynia; st. 2f with reticulated filaments connecting the leaves (Boott). - Wet places, as bogs, common.

62 C. angustata Boott. Spikes 2 or 3, cylindric, slender; spikes 1 to 4, cylindric, sessile, often nodding, the lowest short-pedunculate, the upper stain, at apex and hence tapering above or acute; perig. oval or ovate, acutish, entire at orifice, or short-beaked, scarcely veined, equaling or shorter than the narrow or oblong, subacute, variable brown glume; culm 2f, acutely triquetrous, scabrous, not robust, longer than the stiff, narrow, glaucous leaves. - Very common in largo bogs over the country. (C. acuta, ed. 1st. and Am. auth. not of L.)

63 C. aquatilis Wahl. Spikes 1 - 4, erect, cylindric, lowest bracteate, the glume oblong, obtusish; spikes often 3, cylindric, thick above, 1 - 2' long, sub-erect, short-pedunculate, densely-flowered; perig. elliptic, lenticular, rather small, entire, glabrous, protruded at the orifice, scarcely equaling the green, ovate, acutish glume; st. 20 - 30' high, rather obtuse-angled and scarcely scabrous. - In marshes and wet places, common.