560 CLVl. JUNCACEiE. Jdncus. 



with an involucre of two unequal, pungent bracts : perianth segments lanceolate, 

 acute, half as long as the roundish-obovate, mucronate capsule. Sandy sea- 

 coasts, N.. J, to Ga. Scapes fascicled on the rhizomas, forming dense tufts, 2 — 

 3f high. Panicle 2 — 3' long. Involucre with one of the bracts longer, the 

 other shorter than the panicle. Perianth brown, the 3 sepals longest, acumi- 

 nate, reflexed at apex. July. 



3. J. EFFtJsus. Soft Rush. Bull-rush. 



Scape straight, not rigid ; panicle lateral, loose, decompound ; caps, obovate, 

 obtuse. — Very common in ditches and moist lands, forming tufts. Can. and U. 

 S. Scape solid, with a spongy pith, soft, striate, 2— 3f high, bearing a loose, 

 spreading panicle, which protrudes from a fissure opening in the side of the 

 stem about half way up. Flowers small, green, numerous, with 3 white an- 

 thers and yellowish seeds. June, July. 



4. J. SETACEUS. Rostkow. (J. filiformis Michx.) Bristly Rush. 



Scape filiform, striate ; uvibel lateral, compound, few-flowered ; ped. com- 

 pressed, several-flowered ; perianth segments very acute. — Swamps, Can. and 

 U. S. A very slender species, growing in tufts about 2f high. Scapes sheathed 

 at base. Panicle small, 20 — 30-flowered, bursting from the side of the scape 

 some distance below the summit. July, 



5. J. FILIFORMIS, Linn, (not Michx.) Thread Rush 



Creeping, leafless ; scape slender, filiform, minutely striate, flaccid ; pani- 

 cle subsimple, lateral, near the middle of the scape ; sep. pale, nearly equal, 

 lanceolate, a little longer than the pale, shining, obovate, mucronate capsule. 

 White Hills, N. H., Green. Scape a few inches in length. 

 * * Leaves nodose-articulate, subterete. 



6. J, MiLiTARis. Bw. Bayonet Rush. 



Lf. solitary, jointed, longer than the stem ; panicle terminal, proliferous ; 

 hds. about 5-flowered ; st. thick, round, smooth, 2, 3 or 4f high. — Ponds, N. Eng. ! 

 Leaf jointed, cylindrical, loosely cellular within, 2 — 3f long, inserted below the 

 middle of the stem, but rising above its summit. Panicle erect, terminal, com- 

 posed of several pedunculate heads, each with 4 — 6 sessile flowers, 



7. J. NODosus. (J. polycephalus. Michx. J. echinatus. Muhl.) 



St. leaves subcompressed ; panicle terminal, decompound; hds. globose, 

 dense, 10 — 15-flowered; sep. subequal, lanceolate, rigid, very acute, about 

 equaling the oblong-lanceolate, acute,, triquetrous, shining capsule ; segments 

 3 — 6. — In boggy meadows, U. S, and Can, Stem 1^ — 2f high. Leaves thick, 

 jointed by internal, transverse partitions. Heads resembling small burrs, some 

 sessile, others pedimculate. Leaflets of the perianth produced into a short cusp 

 or awn. Aug. Sept. 



a. major. St. and Ivs. thick, the latter longer, compressed ; hds. few, 6" diam. 



/?. altior. St. (2f high) and Ivs. terete, very slender ; hds. 5 — 9, 4" diam. 



y. minor. Lvs. almost filiform ; hds. 1 — 3, as large as in 0. 



8. J. ACUMiNATUs. Michx. (J. acutiflorus. Hook 7) 



St. erect; lvs. terete; panicle terminal, compound; hds. 3 — 6-flowered, 

 both pedunculate and sessile ; leaflets of the perianth linear-lanceolate, mucro- 

 nate, shorter than the acute capsule. — Very common in boggy meadows, U. S. 

 Stem 12 — 18' high, tough and wiry. Leaves few and short, with knot-like 

 joints. Panicle erect. Aug. 



9. J. suBVERTiciLLATUs. Willd. (J. fluitaus. Michx.) . 



St. few-leaved, compressed ; lvs. compressed, fistulous, articulate ; panicle 

 subcorymbose, elongated ; fls. in dense, capitate fascicles ; hds. many-flowered, 

 pedunculate or sessile ; perianth shorter than the triquetrous, acuminate cap- 

 sules ; sep. linear-lanceolate, keeled, striate, cuspidate. Swamps and shores of 

 ^ondiS, Pervn., Dr. Darlington, {0 Wis., Lapham! Stem 18' — 2f liigh, slender, 

 Leaves much shorter. Panicle 4 — 8' in length, the branches subverticillate, 

 diverging, very unequal. Sepals with scarious, white margins. 



10. J. coNRADi. Tuckerman, in Torr., N. Y. State Fl. II. p. 328, i^iedit. 

 St. leafy; lvs. few, terete, sabfiliform, obscurely articulate, shorter than 



the stem; fls. single, scattered, central and unilateral on the slender branches 



