560 CLVl. JUNCACE^. Juncub. 



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. EFPUsus. Soft Rush. Bull-ru^h. 



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 ; iimbel lateral, compound, few-flowered ; ped. com- 

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

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

 at base. Panicle small, 20 — 30-flowered, bursting Irom 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, C3iindrical, 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 pedunculate. Leaflets of the perianth produced into a short cusp 

 or awn. Aug. Sept. 



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



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



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



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



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

 both pedunculate andsesssile; 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 i&\r! and short, with knot-like 

 joints. Panicle erect. Aug. 



9. J. scBVERTiciLLATUs. Wllld. (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 

 ponds, Penn., Dr. Darlington, to Wis,, Lapham! Stem 18'— 2f high, slender. 

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

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



10. J. coNRADi. Tuckennan, in Torr., N. Y. State Fl. 11. p. 328, inedit. 

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



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



