CYPERACE.E. (SK-DGE FAMILY.) 515 



the mar<rin.-: ; bristles hispid ; nut pale brown, obsrurely wrinkled, shining, 

 crowiiud with a sessile coiiieal-bcakcd acute tubercle. (Scirpus equisetoides, Ell.) 



— Ponds, Florida, and northward. July - Sept. y.— Culms l°-2° high, 3" 

 in diameter. Sheaths brown. Spikes 1' long. 



2. E. quadrangulata, II Br. Culms unequally 4-sided, with the angles 

 acute; scaKs ])alc, roundi>li, very obtuse, scarious on the margins; bristles sli ii- 

 der, bearded, unequal ; nut broadly obovate, finely pitted, dull white ; tubercle 

 ovate or conical, free around the base, much shorter than the nut. (Scirpus 

 quadrangulatus, Mir/ir.) — Ponds and ditches, Florida, and northward. July - 

 Sept. U — Culm 20-3° high, 1"- 2" in diameter. Sheaths purplish. Spikes 

 I'long. 



3. E. cellulosa, Ton-. Culms obscurely 3-angled below, terete above ; 

 scales pale brown, round-obovate, white and scarious on the margins ; bristles 

 rather rigid, nearly or quite smooth ; nut oblong-obovate, conspicuously pitted, 

 naiTOwed into the conical (at length flattened) tubercle. — Marshes, Apalachi- 

 cola, Florida, and westward, near the coast. Aug. and Sept. IJ. — Rootstocks 

 creeping, slender. Culms l°-2° high, H" in diameter. Upper sheath elon- 

 gated. Spikes A' - 1' long, spirally twisted. 



•*- -t- Scales oblong, nerved on the hack, thin on the margins : style 2 - 3-cleft : bristles 

 7, strongly bearded, longer than the nut. 



4. E. Robbinsii, Oakes. Culms erect, rather slender, acutely 3-angled, 

 intermixed with hair-like abortive ones; spike 6-8-flowered, acute; scales 

 greenish, obtiuse, rather distant on the flattened rachis, closely imbricated ; style 

 2-cleft; bristles unequal, as long as the nut and tubercle ; nut (1" long) deeply 

 pitted in lines, scarcely shorter than the subulate tubercle. — Shallow ponds, 

 near Quincy, Florida, and in New England, Oakes, Olney ; but not as yet de- 

 tected at any intermediate point. Aug. — Rhizoraa filiform. Culms 6'- 12' 

 high. Spikes ^' long. 



5. E. elongata, n. sp. Culms floating, slender, terete, mingled with hair- 

 like abortive ones; spike 1 2 - 20-flowered, acute; scales rather distant on the 

 compressed rachis, oblong-ovate, obtuse, green on the back, dark brown on the 

 sides ; style 3-parted ; bristles rather longer than the obovate biconvex or some- 

 what 3-anglcd faintly pitted nut; tubercle minute. — In still water, near Apala- 

 chicola. July. y. — Rootstocks filiform. Culms 2° -3° long, all but the 

 summit immersed. Spikes 6"- 9" long. Nut ^" long. 



* * Spikes thicker than the culm : style Z-cleft : nut 3-angled. 

 t- Bristles 6, as long as the nut and tubercle : nut longitudinally furrowed and pitted. 



6. E. tuberculosa, R. Br. Culms somewhat compressed, tough and 

 wiry; spikes pale, ovate or oblong, acute; scales oblong, rigid, 1-nerved; nut 

 obovate, as large as the ovate compressed 3-angled tubercle ; bristles rigid, his- 

 pid. — Varies with larger spikes and pubescent bristles. (Scirpus tuberculosus, 

 Michx.) — Wet places, chiefly along the coast, Florida, and northward. March 



- Sept. y. — Culms 6' - 12' high. Spikes 3" - 4" long (6" - 8" in the var.). 

 Nut shining. 



