560 CLV1. JUNCACEJE. JUNCUS. 



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. EFFUSUS. 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 ; umbel lateral, compound, few-flowered ; ped. com- 

 pressed, several-flowered ; perianth segments very acuie. 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; 

 Ms. 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, ccna- 

 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; lids, 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. St. and Ivs. thick, the latter longer, compressed ; Ms. few, 6" diam. 



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



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



8. J. ACUMINATUS. Michx. ( J. acutiflorus. Hook ?} 



St. erect ; Ivs. 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 1218' high, tough and wiry. Leaves few and short, with knot-like 

 joints. Panicle erect. Aug. 



9. J. SUBVERTICILLATUS. Willd. (J. fluitans. Michx.} 



St. few-leaved, compressed ; Ivs. 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. Tuckerman, in Torr., N. Y. State Fl. II. p. 328, inedit. 

 St. leafy; Ivs. few, terete, subfiliform, obscurely articulate, shorter than 



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



