140 CYPERACEAE 



T .i?' ^'^^f^ Tuckerm, Culms stout, leafy. Rootstocks with long stolona. 

 ifw! ^^P^ftf nodulose. Spikes 3-10, the upper 1-5 staminate, slender, the 

 f S Ti ^'^^'ii^^^' many-flowered, erect. Bracts leaf-like, equaUlng or exceeding 

 thf^ on}m, often sheathing PistiUate scales acute or aristate, ovate or lanceolate. 



Perigy 



flated nearly orbicular m cross-section, many-nerved, often hairy, round-taper- 

 f.V\i:% ^^%^y^^'^S into a bidentate beak. Achenes triangular, often stipi- 



kkI^Vk fl ^""^^ ^^1 ^^/^^P^ concave, apiculate, continuous with the straight or 

 shghtly flexuous slender style. Stigmas 3. 



6-12 



Willd. Culms stout, purpUsh-tinged and filamentose at 



I'nnto oT.,-i-^c, 1 [TV ] ' ^^"^."""■"^^ y,^-^ "i"'- vviue, soinewnai glaucous: stam- 

 nT.li;T r I' ^^^'t'^T' Pi«t^"ate spikes 2-5, 3-10 cm. long, 1 cm. wide scales 

 SroS ^^ A ^7*^ ^"^ aristate; pengynia ovoid, 6 mm. long, 2.5 mm wide, 

 strongly nerved. In swamps: Newf.-Del.-Ia.-Man.-Ida Boreal. J^Jl 



i\ui^l'i!?' ^ff "g^nosa Michx. Cuhns stoutish, more or less reddened and 

 «r.Z! 1 I ^- . ^^^^■' ?7,^ "*"■ ^^eh, sharp-angled and rough above; staminate 

 «^n^tl7 ' ^^*P/i pistillate spikes 1-3, 1-5 cm. long, 5-7 mm. wide; scales 

 acuminate or aristate; pengynia ovoid, the beak bidentate. C. Watsoni Olney. 

 Sjvampy places: N.S.-D.C.-Mo.-N.M.-Cahf.-B.C. Plain-Mont. J^ 



f\wittt!?' ^f^}^^^^ E^rh. Culms slender but stiff, strongly reddened and 



1 ^ 5ltw^' the base, 6-9 dm. high, obtusely angled, smooth^ staminate spikes 

 shn^t «i^^>. P''^?"^t^ ^P'kes 1-3 1-5 cm. long, 5-7 mm. wide; scales acute or 

 ?«r.S; WK ' P^"F^'S oval-ovoid, 2 mm. wide, the beak bidentate. C. fill- 

 PMn-A^rS ^^'^"^P^- Neu-f.-N.J.-Ia.-Colo.-Ida.-B.C.;Euriia. 



h\ai^t.?h^^f^^^i°'^^^ ^%''- Long-stoloniferous; culms stoutish, 3-8 dm. 



2 5r '^ i!r 1 ^"^ ^T'o '^'^^' ?tam"iate spikes 1-3, distant; pistillate spikes 

 nl«tP Un f ''"'• °r^' ^"^^ ™™- ^''^^' ^^*^^^ lo«^«^ly 15-35-flowered; scales lance- 

 Mp ' M?.^ "^ li P^"g>'^f «:r?id, 3 mm. wide. Sandy or rocky soil: N.S.- 

 J>le. — Mmn. — Sask. Boreal. My-Au. 



lp«/hLS'^it®^*'°'^^S* ?T^y- <^"^"i« ^12 dm. high, very rough above; 

 ind blnn^f ^'"- ^''f""' gl^^o^s; sheaths puberulent towards the top, breaking 

 denspiv r.^^ filamentose; staminate spikes 2-6, distant; pistillate spikes 2-4, 

 nS^.KK "^'oTnP* ^^ *,^^ ^^^' ^-^^^ Cm. long, 10-16 mm. wide; perigjo^- 



Kan^ ^M 'T' M^ ""S^/ '^"^',^4 ^"^- ^de. Marshes: Ill.-Man -Mo. 

 ivans. — Mont. — bask. Plain. My-Jl. 



aholt'^'lp^f Wo*?^''°rJlo ^P>"«^"g-.j Cuhns stout, 6-15 dm. high, often roughish 

 stamh^.tp : -v^^^^^^-^r- ^''^^' •?/*^" pubescent beneath, as are the shetths; 

 thpT?.P % ??^' V' ^'f^'^^j pistillate spikes 3-5, densely flowered except at 

 R Rf m: V""- te""!' \}^ mm wide; perigynia a-12 mm. long. C. arislata 

 R^Br. Marshes: N.Y.-Mo.-Colo.-Utah-Ore.-Yukon. p£in-Submont. 



he\awih?'.■StS^^a^^^^^u^T^''''■■ Strongly stoloniferous; culms verj' smooth 

 Srs about foJr^LM-J"'^^^"'*^"" bright-colored nor fibrillose at the base; 

 shoof sf .n?r.,-S / i^ J'H'^^ ^ "'"'• ^'<^^' 2^ dm. long (or longer on sterile 

 thP mnnfrthf ^ ^^f t-P^bescent, as are the sheaths, the latter dtrk-tinged at 



distant n^;tSfp'^-l ^'"""^'"i^ ^S^ '^^^^^ filamentose; staminate spikel 2-3, 

 obW-^^lfn^t 9^^^^ usually 2, ^idely separate, sessile or short-peduncled 

 DerW,;?^ ^ r'^' V '''"•Jo^g' t^O mm. wide, rather closely 25-60-flowered 



ri^S iLl S., ''''^V'V'^'Pf ^''^"*' ^'^^ ^^^^ bidentate, the teeth less than 

 1 mm. long, scales ovate-lanceolate, acuminate or cuspidate. Swamps: Calif. 



towtrds^1,?Stp ^t''^'- ^"^.' .'^^^^f^? ^""^ «t"«t' obtusely triangul 

 nn^^'J^ *?L^"i'^:.^ri!l,?!P^t^.^'^'i"^.«««' the blades narrow. S% 



normally the termmal 



Spikes 2-10, 



Hpn^plv flr^^l.r.1 Q o^a,ix^.xxatc Liie omers pistillate, suborbicular to oblong, 



Bracts leafy, more or less sheathing. ' Pis- 



