738 Oedee ]56.— CYPERACE^. 



narrowly linear, striate; eheath 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, vrith a broad, scarious margin; bristles ; ach. obovate^ 

 pyriform, shining, minutely punctate, of a light, shining yellow, the minute tubercle 

 fuscous. — Wet places N. T. to 111. 



17 E. aoicularis R. Br. Culm leafless, setaceous, quadrangular, very slender, 

 3—6' high ; spike compressed, oblpng-ovate, acute, 4 — 8-flowered ; glumes oV 

 tusish, the lowest one larger and empty; ach. obovoid, triangular, striated length- 

 wise. — Edges of ponds, often partly submersed, U. S. and Brit. Am. Very deli- 

 cate. June, July. 



18 E. pigm^a Torr. Culm I — 2' hiqfi, setaceous, compressed, sulcato; spikoB 

 ovate, compressed, 3— 6-fld. ; gl. mostly empty; bristles G, longer than the 

 aoheuium, slender, scabrous backwards; ach. ovate, acute, triangular, smooth, not 

 striate, whitish and shining ; tubercle minute. — Sea coast, JIass., to Fla. and La. 



19 E. mlorocarpa Torr. Culm capUlary, 4-angIed, 5 to 8' long ; spike oblong, 

 compressed, lO to lO-flowered, about 2" long, often proliferous; glumes ovate, 

 acutish, keeled, chestnut brown, the lowest much the largest, bristles 3 to 5, 

 shorter than the acheuium which is minute, smooth, whitish, with a very minute 

 tubercle. — "Wet places, N. J., also La. 



20 E. prolifera Torr. Culms capillary, 4-angled and furrowed, 4 to 12' long, in 

 dense tufts ; spike minute, 1 to 2" long, compressed, 4 to ^-flowered ; glumes ovate, 

 chestnut brown, with scarious marguis, often proliferous, that is, producing new 

 culms instead of flowers; bristles 3 or 4, much shorter than the achenium whidi 

 is 3-angled and with a broad, depressed tubercle. — Fla. I to La. (Hale). (Chato- 

 cyperus Baldwinii Torr.) 



6. SCIR'PUS, L. CLUB-ausH. BuLLRUSH. (Celtic cirs, the general 

 name for rushes.) Glumes imbricated on all sides ; perigynium of 3 — 6 

 bristles, persistent; sty. 2 — 3-cleft, not tuberculate at base, deciduous; 

 aehenium biconvex or triangular. — % Stems mostly triquetrous, simple, 

 rarely leafless. Spikes solitary, conglomerated or corymbous. 



§ SoiEPDS. Bristles retrorsely denticulate, about cqualinf; the aoheuium, (*) 



* Spike single, terminal, with a Khort, erect bract at its base Nos. 1—8 



•^ Spikes Beveral or niauy clustered on each culm, (a) 



a Clusters of spikes lateral— on the terete, leafless culm Nos. 4, 6 



— on the triangular culm Nos. 6—8 



a Clusters of spikes terminal, mostly umbellate, (b) 



b Glumes lacemtely 3-toothed. Spikes large (9 to'12" lon<r) Nos. 9, 10 



b Glumes cntlro.— Spikes small (1"), collected in globular heads Nos. 11, 12 



— Spikes small (2 to 8'' long), separate No. 18 



% TRicopnoBuM. Bristles 6, tortuous, tawny, much lougerlban the acheuium, an(i 



Qxserted. Stem (culm) leafy. Umbel decompound Nos. 14, 16 



1 S. planifolius Muhl. Culm ccespitous, leafy at base, acutely and roughly 3- 

 angkd,,5 — 10' high; Ivs. broad-linear, flat, rough on the margin,' equaling the 

 stem,; spite oblong-lanceolate, compressed, terminal, 4 — 8-flowered; glumes ovate- 

 mucronate, yellowish ; 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. (Bobbins), IST. T. to Del. June. 



2 S. subterminalis Torr. Oulm floating, furrowed, inflated, leafy below, 1 to 3f 

 long; Ivs. very narrow, almost capillary, 2 to 4f long; spike somewhat itrmina^ 

 (the stem being continued above it in the form, of a brad), lanceolate ; style 2-cleft ; 

 bristles 6. — Streams, &c., Mass. to N. Y., Mich. Aug. 



3 S. csespitosuB L. Oulm axspitous, round, sheathed at base with numerous nr 

 dimenis of leaves ; spikes compressed, terminal; 2 lower glumes involucre-like, as 

 long as the spiko ; ach. with G bristles. — Grows in dense tufis, 4 — 1 2' high. Spike 

 4 — 5-flowered, reddish-brown. On the alpine summits of Mts., N. States. Jl. 



4 S. debilis Pursh. Oulm csespitous, roundish, deeply striate, 9 to IG' higJi, with 

 a few subulate leaves at base ; spikelets about 3, short-ovoid, sessile, crowded, 

 lateral, the culm continuing a fourth of its length ahove them, glumes ovate, obtuse, 

 carinate, pale green ; ach. obovate, muoronato ; bristles 4 or 6. — Borders of poad» 

 and rivulets, N. Eng. to Car. Aug. 



