5. ELEOCH'ARIS, R. Br. Spiked Rush. (GrOrder CLV Cyperaceae The Sedges Part 4 2118 a marsh,., Order CLV Cyperaceae The Sedges Part 4 2119 to rejoice; plants delighting in marshy grounds.) Spikes terete; glumes imbricated all around; bristles of the perigynium mostly 6 (3 to 12) rigid, persistent; style 2 to 3-cleft, articulated to the ovary; ache-nium crowned with a tubercle which is the persistent, bulbous base of the style. - Mostly Order CLV Cyperaceae The Sedges Part 4 2120 . St. simple, leafless. Spike solitary, terminal.

§ LIMNOCHLOA. Spike cylindrical, elongated (10, glumes rounded, pale, spirally arranged.

Culms stout, 2 to 4f high.................................................................................................

No. 1, 2

§ ELEOCHARIS. Spikes ovoid or lanceolate, teretely imbricate (*).

* Spike lance-oblong, length thrice greater than the diameter (a).

a Culms terete (1 to 2f). Spike rusty brown, 5 to 10" long..................................

No. 3

a Culms flattened, hair-like or thread-like, narrower than spike..........

Nos. 4, 5

a Culms 3-angled, stout, as broad as the spike. Lvs. ? floating.........................

No. 6

* Spike ovoid-oblong,length less than thrice the diameter (b).

b Spikes greenish white, globous-ovoid, 2 to 3" long. South..........................

Nos. 7, 8

b Spikes brown, or the glumes brown in the center (c).

c Culms 4 or 5-angled. 2 to 12" high.............................................

Nos. 9,10

c Culms terete, 8 to 14" high.........................................................

Nos. 11, 12

c Culms flat. - Bristles 4 to 6, longer than the achenium...................

Nos. 13, 14

- Bristles few, shorter than ach. or none.......................

Nos. 15, 16

§ CHaeTOCYPERUS. Spike flat, glumes imbricated in 2 or 3 rows. Culms capillary, - 1 to 8' high, never proliferous at the top....................................................

Nos. 17,18

- 5 to 12' long, often proliferous at the top...................................................

Nos. 19, 20

1 E. eqttisetoides Torr. Culm about 2f high, papillous, terete, 2 - 3" diam.,with about 20 joints, produced by internal, transverse partitions; sheath radical, obtuse, membranous; spike oblong-cylindrical, about 1' in length, acute and slightly contracted at base; glumes roundish-ovate, cartilaginous, obtuse; bristles 6, as long as the achenium; sty. 3-cleft; ach. brown, shining. - Bogs, Cumberland, R. I. (Olney), Del. to Ga. It strikingly resembles Equisetum hyemale.

2 E. quadrangulata R. Br. Culm 2 - 4f high, acutely and unequally quadrangular, the broadest side convex, the others concave; sheaths radical, purplish; spike 1' or more in length; glumes roundish-ovate, obtuse, coriaceous; bristles 6; ach. obovate, of a dull white. - Penu., Md. (Robbins),to Ga. and La. In swamps and inundated banks.

3 E. palustris R. Br. Rhizomes creeping; culms subterete (slightly 4-sided below), spongy, 9' to 2f high, varying from filiform to 1 1/2" diam.; spikes oblong-lanceolate, rather obtuse, 3 to 6 to 10" long, many-flowered; glumes oblong-ovate, obtuse, rusty or tawny brown, with a broad, loese, scarious margin, the lowest enlarged; ach. obovate, smooth, shining, yellowish.

β. calva. Bristles none; culms filiform. - W. N. Y. (E. calva Torr.).

4 E. intermedia Shultes. Tufted culms setaceous, diffuse, compressed, furrowed, hard, wiry, 6 to 8' long; spike lance-ovate, acute, 2 to 3" long, 7 to 9-flowered, glumes, lance-ovate, acute, reddish-brown, with a green midvein; bristles 6, white, longer than the achenium; sty. 3-cleft; ach. obovate, attenuated to the base, striate, of a light brown color. - In running water, forming a dense turf, N H. to Ga., W. to Ohio. Jl

5 E. tricostata Torr. Culm filiform, flattened, striate, 1 to 2f high; spike cylin-dric-oblong, dense-flowered, 6 to 9" long; glumes ovate, obtuse, rusty browm, with a broad, scarious margin and a green midvein; bristles 0; ach. obovate, with 3 prominent, thick angles, roughish, brown, crowned with a whitish, minute tubercle; style 3-cleft. - Wet places, N. J. to Fla.

6 E. Robbinsii Oakes. Culms clustered, 9 - 25' high, rigid, sharply triangular, pale green, several of them fruitless; sloeath truncate; spike 3 - 12" long, scarcely thicker than the stem, placed 2 - 5" below its apex: glumes 3 - 9, linear-lanceolate, acute, Anally brownish; bristles 6, twice longer than the achenium; ach. 1" long, pale brown; tubercle closely sessile. - Ponds and ditches, N. II. and Mass. (Ricard). Very distinct. In water a part of the stems are floating and as fine as hairs. Jl.

7 E. capitata Brown. Culm filiform, furrowed, angular, 4' to 6', in tufts; spike globular-ovoid, 2" long, greenish white; glumes 12 to 15, oblong, obtuse; bristles 6, some of them a little exceeding the ach., which is broadly obovate, lens-shaped, black, shining, crowned with a minute, depressed tubercle; stylo 2-cleft. - Wet places, Ga., Fla. to La.

8 E. albida Torr. Culm filiform, terete, striate, sulcate on one side, 8 to 12"; spike ovoid, acute, 2 to 3" long; glumes 20 to 30, whitish, ovate, rather acute; bristles 6, brown, longer than the chestnut-colored, smooth, broad-ovate ach.; tubercle small, acute; style 3-cleft. - Wet, sandy places, Ga., Fla. to La. Known at sight by its whitish heads. Sheaths very short.

9 E. olivacea Torr. Culms ccespitous, 2 - 4' high, slender, subcompressed, sub cate, soft; spike ovate, acutish, 2 - 3" long, 20 - 30-flowered; glumes ovate, obtuse, reddish-brown, with scarious edges and a green midvein, the lowest largest; bristles 6; sty. 2-cleft; ach. broadly obovate, smooth, of a dull, blackish-olive color when ripe. - Sands, generally partly submersed, Providence, R. I. (Olney) Mass. to Ga.

10 E. tenuis Schultes. Culm almost filiform, quadrangular, the sides sulcate, 8 - 15', with a long, purple sheath at base; spike 2 to 3" long, elliptic-oval, acute at each end; glumes dark purple, ovate, obuse, the lower ones larger and empty: ova. roundish, tapering below, invested with 2 or 3 or 0 setae. - Common in wet places, Can. and U. S. Jn., Jl.

11 E. obtusa Schultes. Culm sulcate, subterete, 6 - 15' high; spike ovoid, very obtuse, often nearly globous; glumes 60 to 100, rouna, dark brown, with whitish margins; ach. obovate, compressed, smooth, brown, invested with 6 setae as long as the glumes, and crowned with a broad, flat tubercle. - Shallow waters, Can. and U. S., common. Jl.

12 E. tuberculosa R. Br. Culm columnar, striate, 12' high, leafless, sheathed at base; spike ovate-lanceolate, acutish, glumes very obtuse, loose; ach. somewhat triquetrous, not larger than the sagittate tubercle with which it is crowned; bristles 6, as long as the tubercle. - Sandy swamps, N. Eng. to Flor. and La. Remarkable for its large tubercle. Jl.

13 E. simplex Torr. Culm acutely 3-angled (terete Torr.), filiform, striate, 12 to 18'; spike ovoid, acutish; scales ovate, obtuse, whitish with a brown center; bristles 6, rigid, longer than the ach., which is broad-obovate, furrowed lengthwise, olive-green, crowned with a large, distinct, conic-beaked tubercle; style 3-cleft. - Wet places, N. Car. to Fla. and La

14 E. rostellata Torr. Culm 15 - 20', clustered, angular and sulcate, slender, almost filiform, rigid; sheaths obliquely truncate, the lowest blackish at summit; spike lance-ovate, acute, 3 - 4' long; glumes 12 - 20, lance-ovate, smooth, light brown, edge scarious; bristles 4 to 6, longer than the smooth ach., which is biconvex, olive-brown, with a confluent, acuminate tubercle, shorter than the 6 bristles. - R. I. (Olney), N. Y. (Sartwell), to Mich.