cyperacejs. (sedge i-vmily.) 511 



bracts light brown, resembling the scales, or with a prolonged point, shorter 

 than the (at maturity) brown and chaffy-looking spikes. — Siccat.e. 



11. C Iji'OUioklcs, Schk. Spikes 4-G, alternate, oblong-lanceolate, some 

 of the central ones wholly fertile; perigynia ereet, narrow-lanceolate with a taper- 

 ing point, solid and spongy at the base, longer than the lanceolate scale ; st) le 

 jointed at the base. — Swamps, &c. ; common. — A slender species, occasionally 

 dioecious. 



12. C Siccista, Dew. Spikes 4 -8, ellipsoid, the uppermost, and commonly 

 1 - 3 of the lowest, fertile below, the intermediate ones frequently ah staminate ; peri- 

 gynia ovate-lanceolate, compressed, with a long rather abrupt beak, about the 

 length of the scale; style minutely hairy. (C. pallida, C. A. Meyer. C. Lid- 

 doni, ed. 1, not of Boot.t.) — Sandy plains, New England to Illinois, and north- 

 westward. 



13. C. Sartwcllii, Dew. Spikes numerous, short and ovoid, the upper chief 

 ly staminate, the lower principally or entirely fertile ; perigynia ovate-lanceolate, the 

 margins not united to the top, leaving a deep cleft on the outer side ; scale ovate, 

 pointed, about the length of the perigynium. — Seneca County, New York (Sart- 

 we/l), to Illinois. — Too near C. intermedia of Eu. 



§ 2. Spikes pistillate below, staminate at the summit. 



* Perigynia of a thick and corky texture, with a short 2-toothed roughly-margined 

 beak, nerved towards the base, dark chestnut-brown and polished at maturity: 

 spikes decompound, paniculate : scales li.nht brown, with white memlirana- 

 ceous margins ; the bracts at the base resembling them, and with a short bristly 

 prolongation. — PanicuiAtje. 



14. C teretiikscatila, Good. Spikes with very short appressed branches, 

 forming a slender crowded spiked panicle ; perigynia ovate, unequally biconvex, 

 short-stalked, with 3-5 short nerves on the outer side near the broad somewhat heart- 

 shaped base ; scale acute, rather shorter than the perigynium ; achenium obovoid- 

 pyriform, obtusely triangular. (C. paniculata, var. teretiuscula, W<dd.) — Swamps ; 

 common, especially northward. (Eu.) 



Var. luiajor, Koch. Spikes more panicled ; perigynia rather narrower. 

 (C. paniculata, var. minor, ed. 1. C. Ehrhartiana, Hoppe. C. prairiea, Dew.) — 

 Bogs and low grounds, New England to Wisconsin, and northward. (Eu.) 



15. C. <lenoi2B]>6sita, Muhl. Panicle large, with very numerous dense- 

 ly-crowded spikes on the rather short spreading branches ; perigynia obovate, un- 

 equally biconvex, sessile, with a short very abrupt beak, conspicuously nerved on each 

 side, about the length of the ovate pointed scale. (C. paniculata, var. decom- 

 posita, Dew.) — Swamps, W. New York {Sartwell) to Penn., Illinois, and south- 

 westward. 



* * Perigynia small, compressed, 2-3-nerved, membranaceous, with a short 2- 

 toothed rough beak, yellow or brown at maturity : spikes decompound, with nu- 

 merous small very densely-flowered heads : scales of the fertile spikes tawny, with 

 the green keel prolonged into a rough point : bracts short and resembling 

 them at the base, or often becoming green and bristle- shaped, and much ex 

 ceeding the culm. — Mdltifl6k^e. 



