570 CLX. CYPERACEZ. Scirpus. 
6—9’ long; spike acute, 2—3” long, 7—9-flowered; glwmes lance-ovate, acute, 
reddish-brown, with a green midvein; bristles 6, white, longer than the ache- - 
nium ; sty. 3-cleft; ach. obovate, attenuated to the base, striate, of a light brown 
color.—In running water, forming a strong, dense turf, N. H.! to Ga., W. to 
Ohio, July. 
9. E. acicuLaris. R. Br. (Scirpus. Linn.) Hair Club Rush. 
St. leafless, setaceous, quadrangular, very slender, 3—6’ high; spikelets 
oblong-ovate, acute, 4—8-flowered ; g/wmes obtusish, the lowest one larger and. 
empty ; ach. obovoid, triangular, verrucose, yellow and shining.—Edges of ponds, 
often partly submersed, U.S. and Brit. Am. Very delicate. June, July. 
10. E. tenuis. Schultes. (Scirpus. Willd.) Slender Club Rush. 
St. leafless, almost filiform, quadrangular, the sides sulcate, 8—15’ high, 
with a long, purple sheath at base; spike terminal, elliptic-oval, acute at each 
end; glumes dark purple, ovate, obtuse, the lower ones larger and empty; ova. 
roundish, tapering below, invested with 2 or 3 or 0 setee—Common in wet places, 
N. Eng. and Mid. States. June, July. 
11. E. mevanocarpa. Torr. (Scirpus. Baldwin.) Black-fruited Club Rush. 
Sts. compressed, furrowed, slender, almost filiform, wiry, 12—18’ high; 
sheaths truncate; spike lance-oblong, rather acute, 4—6” in length, 20—40-flow- 
ered; glumes ovate, obtuse, brownish, with scarious margins and a prominent, 
yellowish midvein ; bristles 3, purple ; ach. obovate-turbinate, blackish ; tubercle 
broad, flat, pointed in the centre.—Providence, R. I., Olney! 
12. E. piemma. Torr. 
St. 1—2’ high, setaceous, compressed, sulcate; spikes ovate, compressed, 
3—6-flowered, mostly empty; bristles 6, longer than the achenium, slender, 
scabrous backwards; ach. ovate, acute, triangular, whitish and shining; twber- 
cle minute.—Sea coast, Mass., Oakes. Sept. (Dr. Sartwell, comm.) 
13. E. rosteLuara. Torr. inN. Y. Fl. ined. (Scirpus. Torr. Cyp., p.318.) 
St. 15—20’ high, clustered, angular and sulcate, slender, almost filiform, 
rigid; sheaths obliquely truncate, the lowest blackish at summit; spike lance- 
oyate, acute, 3—4” long; glumes 12—20, lance-ovate, smooth, light brown, edge 
scarious ; bristles 4—6; ach. broadly obovate, biconvex, light olive-brown, with 
a long, slightly tuberculate beak.—R. I., Olney! N. Y., Sartwell. 
14, E. compressa. Sullivant! Fat-stemmed Club Rush. 
St. 12—18’ high, czspitose, much compressed, narrowly linear, striate; 
sheath close, truncate; spike oblong-ovate, 3—5’ in length, 20—30-flowered ; 
glumes ovate-lanceolate, acute, mostly 2-cleft at apex, dark purple on the back, 
with a broad, scarious margin; bristles 0; ach. obovate-pyriform, shining, mi- 
nutely punctate, of a light, shining yellow, the minute tubercle fuscous.— W et 
places, near Columbus, Ohio! A very remarkable species. 
7. SCIRPUS. 
Celtic cirs, the general name for rushes. } 
Glumes imbricated on all sides; perigynium of 3—6 bristles, per- 
sistent ; sty. 2—3-cleft, not tuberculate at base, deciduous ; achenium 
biconvex or triangular.—% Stems mostly triquetrous, simple, rarely 
leafless. Spikes solitary, conglomerated or corymbose. . 
§ 1. Bristles not exceeding the achenium, retrorsely denticulate. 
* Spike solitary, nearly or quite terminal. 
1. S. prantrouius. Muhl. FYat-leaved Club Rush. 
St. czespitose, leafy at base, acutely and roughly 3-angled, 5—10’ high ; 
ls. broad-linear, flat, rough on the margin, equaling the stem; spike oblong- 
lanceolate, compressed, terminal, 4—8-flowered; glwmes ovate-mucronate, yel- 
lowish ; bracts at the base of the spike, cuspidate, outer ones longer than the 
spike; ach. reddish-brown, invested with 6 bristles longer than itself.—In cold, 
hard soils, Mass., Robbins! N. Y. to Del. June. ‘ 
2. S. sUBTERMINALIS. Torr. aii 
St. floating, furrowed, inflated, leafy below, 3f long; lws. very narrow, 
