n42 cYPEUArK.T:. (skdcf. family.) 



§ 1. I'.i ijoriiAifis ]n-o])iT. ^/likes 711(111 i/-J}iiiftic(l : scahs iiiihiitdlfil in xt r- 



eral rows. 

 * Sinkcs cijlhiilriciil, scitrrelji thicker than the soft cd/iilar riiJms : nut hironrcr, 



jiilUtl or wrinkled in lonrjilmliuiil lines. 



t- Scales ronnih (I, thick ami faintli/ n< rved : stifle ti-t-lejl: bristles Q, sjiarint/li, 



liciirilril or smodthish, as lonij as the mil. (Liiiiuocliloa, Nec'8.) 



1. E. equisetoides, Torr. Culms stout, terete, knotted by cross jiarti- 

 tions, rougliisli ; scales pale, rouud-ovate, obtuse or the U])])(;r acute, scarioua 

 ou the margins; bristles his]»i(l ; nut pale browu, obscurely wrinkled, shiniug, 

 crowned with a sessile conical-l)eaked acute tubercle. (Scirjius e(|uisotoide.s, 

 Ell.) — Tonds, Florida, and northw.ard. July -Sept. ^ — Culms l°-2° 

 high, 3" in diameter. Sheaths brown. Spikes 1' long. 



2. E. quadrangulata, K. Br. Culms unequally 4-sideil, with the angles 

 acute; scales pale, roundish, very obtu.se, scarious on the margins; bristles 

 slender, bearded, uuecjual ; nut broadly obovate, finely pitted, dull white, 

 tubercle ovate or conical, free around the base, mucli slujrtcr tlian the uut. 

 — Ponds and ditches, Florida, and northward. July -Sept. ^ — Culm 2° - 

 3° high, \" -2" in diameter. Sheatiis purplish. Sjdkes T long. 



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

 scales pale brown, round-obovate, white and scarious on tiie margins; bri.stles 

 rather rigid, nearly or quite smooth ; nut oblong-obovate, conspicuott.sly pitted, 

 narrowed into the conical (at length flattened) tubercle. — Marshes, Florida, 

 and westward, near the coast. August — Sept. "21 — T\ootstocks creeping, 

 slender. Culms I°-2° high, li" in diameter. Upper slicath elongated. 

 Spikes y-l' long, spirall}' twisted. 



-t- •<- Scales ohlonfj, nerved on the hark, thin on the mnrfjins : .<tli/le 2 - 3-cleft • 

 bristles 7, stronijli/ bearded, longer than the nut. 



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

 intermixed witli hair like abortive ones; spike G - 8-flowercd. acute ; scales 

 greenish, obtuse, 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 northward. Augu.st. — Khizoma filiform. 

 Culms 6'- 12' high. Spikes V long. 



5. E. elongata, Chapm. Culms floating, .slender, terete, mingled with 

 hair-like at)ortive ones ; spike 12-20-fiowered, acute ; scales rather distant on 

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

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

 cr somewhat 3-angled faintly pitted nut ; tubercle minute. — In still water, 

 Floriila. July. ^ — Rootstocks filiform. Culms 2° - 3° long, all but the 

 summit immersed. Spikes 6" -9" long. Xut i" long. 



* * Spikes thicker than the ctdm : sti/le 3-cle/f : nut 3-nngled. 

 •*- Bristles 6, as tongas the nut and tubercle: nut lonqitiidinalhj 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 



