Seimpus. CLX. CYPERACEA, 571 
almost capillary, 2—4f long; spike solitary, somewhat terminal (the stem. being 
continued above it in the form of a bract), lanceolate ; style 2cleft; bristles 6.— 
Streams, &c., Mass.!to N. Y. Aug. 
3. S. czspiTosus. Bracted Mountain Rush. 
Sts. ceespitose,; round, sheathed at base with numerous rudiments of leaves; 
spikes compressed, terminal ; 2 lower glumes involucre-like, as long as the spike; 
ach. with 6 bristles.—Grows in dense tufts, 4—12/ high. Spike 4—5-flowered, 
reddish-brown. On the White Mts.,N. H., Bw. July. 
** Spikes many, lateral. 
4. S. Torrey. Olney. (S. mucronatus. Ph.? Torr.) 
St. 2f high, 3-angled, with concave sides, rather slender, leafy at the 
base; Jws. 2 or 3, 1f or more long, slender; spikes 2-4 (rarely 1), sessile, dis- 
tinct, acute, ovate-oblong; scales ovate, mucronate, smooth; sty. 3-cleft; ach. 
obovate, acuminate, unequally 3-sided, shorter than the bristles.—Borders of 
ponds, N. Eng.to Mich. The stem, here and in the following, is prolonged 
above the spikes, in the form of an involucral leaf. Jl. Aug. 
5. S. pesinis. Pursh. Weak-stemmed Rush. 
St. ewspitose, roundish, deeply striate, 9—16’ high, with a few subulate 
leaves at. base; spikelets about 3, short-ovoid, sessile, crowded, subterminal; 
glumes ovate, obtuse, carinate, pale green; ach. obovate, mucronate ; bristles 4— 
5.—Borders of ponds and rivulets, N. Eng. to Car. Aug. 
6. S. TriquETeR. Michx. (S. Americanus, Pers.) Three-cornered Rush. 
St. nearly naked, 3-angled, corners acute and two of the sides concave, 
about 3f high and ending in a sharp point ; ls. few and short, from the top of 
the sheath; spikes lateral, 1—5, ovate, crowded and sessile, at various distances 
below the point ; glwmes round-ovate, mucronate ; bristles 6.—Ponds and marshes, 
fresh and salt, throughout N. America. 
7. S. uacustris. (S. acutus. Muhl.) Lake Bullrush. 
. Scape smooth, leafless, filled with a porous pith, 5—8f high, cylindric, 
tapering above the panicle, and abruptly ending in ashort cusp; panicle cymose 
near the top; ped. rough, twice compound ;, spekelets ovoid, closely imbricate.; 
scales ovate, mucronate, pubescent; bracts shorter than the paniele-—The largest. 
species of bullrush, frequenting the muddy margins of rivers and ponds U.S. 
to Arc. Am. July. 
8. S. Ouneyr. A. Gr. Olney’s Rush. 
S¢. triquetrous-winged, leafless, 2—7f high ;. sheath radical, tipped with a 
short (1—2’) leaf; spikes 6—12, sessile, aggregated, 2—3” long, placed 9—12” 
below the triangular apex of the stem; glumes roundish-ovate, mucronate; 
bristles 6—12; ach. obovate, plano-convex, gibbous at apex.—Salt marshes,, 
Sekonk river, R.I., Olney! Tom river, N. Y., Kneiskern. Remarkably distin- 
guished by its 3-winged stem. July. See also Addenda, p. 638. 
* * * Spikes terminal. 
9. S. Maririmus. Sea Bulirush. 
St. acutely 3-angled, leafy, 2—3f high; ws. broad-linear, rough-edged, 
carinate, taller than the stem; spikes conglomerate, 6—10, nearly an inch long, 
corymbose; invol. of about 3 very long leaves; glumes ovate, 3-cleft, the middle 
segment subulate and reflexed; style 3-cleft; bristles 3—4, much shorter than 
the broad-obovate, lenticular, dark brown, polished achenium.—Salt marshes, 
N. Eng.! to Flor. Aug. 
B. fluviatilis. Torr. Umbel somewhat compound ; bristles 6, as long as the 
obovate, triangular, dull grayish achenium.—Fresh water swamps- and lakes, 
Western N. Y. to Wis., Lapham! and Mo. 
10. S. arrovirens. Muhl. 
St. obtusely triangular, leafy, 2f high; cyme compound, proliferous ; invol. 
of 3 leaf-like bracts, longer than the cyme; spkes ovate, acute, crowded, 10—20: 
in a globose head; Ads. numerous, 3’ diam., dark green; glumes ovate, mucro- 
nate ; ach. white, smooth ; 4ristles 4-Common in meadows, Middle and Western 
States. June, July. . 
