724 



ORDER 151. JUXCACE^E. 



fissure opening in the side of the stem about half way up. Fls. small, green, 

 numerous, with 3 white anthers and yellowish seeds. Jn., Jl. 



3 J. filiformis L. (not MX.) Rhizome creeping, leafless, scape slender, filiform 

 minutely striate, flaccid ; panicle subsimple, lateral, near the middle of the scape ; 

 fls. separate ; sep. pale, nearly equal, lanceolate, a little longer than the pale, 

 shining, obovate, mucronate capsule. Borders of lakes, N. States and Can. 

 Scape 1 to 2f high, with a few brown sheaths at base. Fls., some pedicellate, 

 some sessile. JL 



4 J. setaceus Rostkow. Scape filiform, striate ; umbel lateral, subsimple, few- 

 flowered; pod. compressed, several flowered ; perianth segments very acute. 

 Swamps, Penn. to Fla., growing in tufts, about 2f high. Scapes weak and slen- 

 der (not setaceous), sheathed at base with the shorter leaves. Panicle small, 20 

 to 30-flowered, bursting from the side of the scape some distance below the sum- 

 rait. Fls. in small heads, scarcely brownish. Jn., Jl. 



5 J. maritimua Lam. BLACK RUSH. Scapes numerous, tall, rigid, terete, sheathed 

 at base; panicle decompound, far below tho summit; fls. aggregated in roundish 

 heads ; sep. lanceolate, acuminate, longer than the roundish-obovate, mucronate 

 capsule. In. brackish marshes, Va. to Fla. Scapes 2 to 5f high, forming dense 

 tufts. Panicle 2 to 3' long, with numerous heads, and subtended by a shorter 

 bract. Fls. dark brown. Jl. (J. acutus Ell., etc.) 



6 J. scirpoides Lam. St. leafy, terete, stout; Ivs. terete, slender, with frequent 

 joints; panicle cymous, branches few, suberect, heads 5 to 20, green, about 20- 

 flowered; sep. rigid, lance-acuminate, sharp; stam. 3, nearly as long; style much 

 exserted ; caps, taper-pointed, as long as the sepals ; seeds oblong, merely acute at 

 each end. Can. and U. S., especially coastward, in wet places. St. 1 to 2f high, 

 about 3-leaved below. Lvs. shorter than the stem. Heads 3 to 4" diam., finally 

 straw-colored. May Jl. (J. echinatus Ell.) 



7 J. polycephalus MX. St. few-leaved, terete, strict ; Ivs. terete-compressed, 

 slender, strict, many-jointed; panicle decompound, loose; heads 5 to 15, globous, 

 many-flowered ; sep. subulate, acuminate, bristle-pointed, the 3 outer longer and 

 wider, greenish, stam. 3, nearly as long ; caps, oblong-triangular, abruptly acumin- 

 ate, longer than, the sepals, at length brownish; seeds oblong, with a white tail at 

 each end. Wet places, Can. and U. S. Sts. 12 to 30' high, rigid, but slender, tho 

 Ivs. shorter. Heads 8 to 20-flowered, 4" diam. May Jl. (J. paradoxus Gray.) 



8 J. dbilis Gray. Sts. iveak and slender, flattened; Ivs. flattened, obscurely 

 jointed ; panicle de- or suprade-compound, loosely spreading ; hds. few-flowered, 

 straw-color ; sep. lanceolate, acute, shorter than the oblong capsule ; seeds ob- 

 long, acute at each end. Common in wet places, Can. and U. S. Sts. 9 to 24' 

 long, from fibrous roots. Heads about 5-flowered (in spec, from "Wis., 1 to 3- 

 flowered), fls. 2" long. Lvs. nearly filiform in the smaller plants. (J. subverti- 

 cillatus Muhl. nee Wulf.) 



9 J. acuminatus MX. St. slender, strict, terete ; Ivs. terete, many-jointed ; pani- 

 cle decompound, branches suberect; heads numerous, 3 to 5-flowered, chestnut 

 brown, fls. erect ; sep. strongly veined, lanceolate, acute and mucronate, much 

 shorter than the oblong-triangular, abruptly pointed capsule ; seeds tailed at both 

 ends. Very common in bogs, etc., Can. and U. S. Sts. 9 to 30' high, slender or 

 rather stout, the slender Ivs. much shorter, many-jointed. Capsules becoming 

 deep brown or (in the Southern spec.) almost black. 



10 J. Fondii. St. rather stout, terete ; Ivs. terete-compressed, jointed ; panicle 

 spreading, diffuse, decompound; heads numerous, globular, 5 to 12-flowered. chest- 

 nut colored ; sep. equal, lance-acuminate, bristle-pointed, as long as the triangular- 

 ovate, abruptly pointed capsule; stam. 3 ; seeds oval, merely acute at each end. 

 "Wet places, Car. to Ga. (Feay, Pond,) and Ky. Sts. 1 to 2f high, with 1 or 2 

 short leaves. Heads 20 to 40, 3 to 4" diam., in a wide panicle. Mar. Jn. (J. 

 acuminatua E1L nee MX.) 



11 J. megacephalus. St. stout, ascending at base ; Ivs. distinctly nodous, elon- 

 gated, the upper usually exceeding the inflorescence ; heads few, glomerate, or 

 some pedunculate, rarely paniculate, large, 30 to QQ-flowered, tawny; sep. subu- 

 late, bristle-pointed, scarcely shorter than the acuminate capsule ; stam. 6 ; seeds 



