CYPERACER. (SEDGE FAMILY.) 515 
the margins; bristles hispid; mut pale brown, obscurely wrinkled, shining, 
crowned with a sessile conical-beaked acute tubercle. (Scirpus equisetoides, Fil.) 
— Ponds, Florida, and northward. July Sept. Y,— Culms 1°-2° high, 3" 
in diameter. Sheaths brown. Spikes 1’ long. 
2. E. quadrangulata, R.Br. Culms unequally 4-sided, with the angles 
acute; scales pale, roundish, very obtuse, scarious on the margins; bristles slen- 
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, Michx.) — Ponds and ditches, Florida, and northward. July- 
Sept. |— Culm 2? -3? high, 1" vg in diameter. Sheaths purplish. Spikes 
1’ long. 
3. E. cellulosa, Torr. Culms — 3-angled belit 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, 
` narrowed into the conical (at length flattened) tubercle. — Marshes, Apalachi- 
cola, Florida, and westward, near the coast. Aug. and Sept. Yl — Rootstocks 
creeping, slender. Culms 19-29 high, 1j" in diameter. Upper sheath elon- 
gated. Spikes J/ - 1 long, spirally twisted. 
+ + Scales oblong, nerved on the back, thin on the margins: NM -oeps M 
7, strongly bearded, longer than the nut. — e 
. 4. E. Robbinsii, Oakes. ` Culms erect, rather slender, — Susi: a 
intermixed with hair-like abortive ones; spike 6—8-flowered, 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 in New England, Oakes, Olney; but not as yet de- 
tected at any intermediate point. Aug.— Rhizoma filiform. Culms 6/- 12* 
high. Spikes J' long. : 
5. E. elongata, n. sp. Culms floating, slender, terete, mingled with hair- 
like abortive ones; spike 12 - 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 somes 
what 3-angled faintly pitted nut; tubercle minute. — In still water, near Apala- 
chicola. July. 1} — Rootstocks filiform. Culms 29-39 ee all but the 
summit immersed. Spikes 6-9" long. Nutj"long. = = | 
* * Spikes thicker than the culm: style 3-cleft: nut S-angled. 
+ 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, I-nerved ; nut - 
obovate, as large as the ovate compressed 3-angled t tubercle ; bristles rigid, his- - 
pid. — Varies with larger spikes and pubescent bristles. (Scirpus tuberculosus, — 
i cm chiefly along the coast, Florida, and northward. | = Y 
