JUNCACEAE. 249 



slightly reticulated in about 20-24 rows, the areolse nearly square. N. B. to N. J., 

 near the coast; Mich., Wis., Minn, and Ont. 



15. Juncus dichotomus Ell. FORKED RUSH. (I. F. f. 933.) Tufted, 3-10 

 dm. high; leaves all basal except those of the inflorescence; blades terete, channeled 

 along the upper side, about one-half the height of the stem ; inflorescence panicu- 

 late, subsecund ; perianth about 4 mm. long, its parts subulate-lanceolate, straw- 

 colored when old ; stamens 6 ; capsule slightly shorter than the perianth, oblong, 

 obtuse, mucronate, i-celled; seed oblong, dark brown, obliquely apiculate, less than 

 0.5 mm. long, reticulate in about 14 longitudinal rows, the smooth areolse about as 

 long as broad. In dry soil, Me. to Fla. and Tex., near the coast. 



16. Juncus setaceus Rostk. AWL-LEAVED RUSH. (I. F. i. 934.) Densely 

 tufted. Stems terete, spreading, 4-10 dm. long ; leaves all basal except those of 

 the inflorescence, the uppermost sheath usually bearing a long terete blade similar 

 to the stem, but channeled; the other sheaths with filiform blades; involucral leaf 

 appearing like a continuation of the stem, 1-3 dm. long; inflorescence appearing 

 lateral, 5 cm. long or less ; perianth 2-5 mm. long, its parts lanceolate, acuminate, 

 rigid, widely divergent in fruit; stamens 6; capsule globose, shining, mucronate, 

 i-celled, barely dehiscent; seed subglobose, 0.5-0.6 mm. long, reticulate in about 

 12 longitudinal rows. In marshes, Del. to Fla. and Tex., near the coast, extending 

 north in the Miss. Valley to Mo. 



17. Juncus marginatus Rostk. GRASS-LEAVED RUSH. (I. F. f. 935.) 

 Tufted, 1.5-7.5 dm. high from branching rootstocks. Leaf-sheaths auriculate ; 

 blades 1-3 mm. broad, 2-4 conspicuous veins in addition to the midrib ; inflores- 

 cence i dm. high or less, the panicle composed of 2-20 turbinate to subspherical 

 5-io-flowered heads; perianth 2.5-3.5 mm - l n g> the outer parts ovate, acute, the 

 inner slightly longer, obtuse, with hyaline margins ; stamens 3 ; anthers ovate, much 

 shorter than the filaments ; capsule equalling the perianth, obovoid, truncate or 

 retuse, almost 3-celled, the placentae deeply intruded; seed oblong, 0.4-0.5 mm. 

 long, pointed at either end, i2-i6-ribbed. Grassy places, Me. to Ont., Fla. and 

 Neb. 



Juncus margin&tus aristulktus (Michx.) Coville. Taller, sometimes i.i m. high ; leaf- 

 blades 2-5 mm. broad ; heads usually 20-100, mostly 2-5-flowered. N.Y. to Fla. and Mex., 

 mostly near the coast ; Miss. Valley to Kans. and Mich. 



Juncus marginktus set6sus Coville. Inner perianth-parts ovate or lanceolate, acute 

 or acuminate ; seeds smaller. Kans. to Mex. 



1 8. Juncus longistylis Torr. LONG-STYLED RUSH. (I. F. f. 936.) Stems 

 erect, loosely tufted, 2-7.5 dm. high, slender, compressed, i-3-leaved. Leaf-blades 

 1.5-3 mm. wide, the midrib well defined; inflorescence 5 cm. high or less, usually 

 of 2-10 irregular 3-8-flowered heads, or reduced to a single larger one ; perianth 

 5-6 mm. long, the parts equal, brown, lanceolate, acuminate; stamens 6, the yellow 

 linear anthers longer than the filaments; style about I mm. long; stigmas 2-3 mm. 

 long; capsule shorter than the perianth, oblong, brown, angled above, obtuse or 

 depressed at the summit, mucronate, 3-celled; seed oblong, white-tipped, about 0.5 

 mm. long, !4-2O-ribbed. Neb. and the Rocky Mountain region. 



19. Juncus repens Michx. CREEPING RUSH. (I. F. f. 937.) Perennial by 

 prostrate rooting branches; stems compressed, ascending, floating or prostrate, 0.5-5 

 dm. long. Leaves with compressed sheaths, auriculate, the blades 2-8 cm. long, 

 1-2 mm. broad, filiform-acuminate; inflorescence of 1-8 heads, one or more heads 

 often occurring also at the lower nodes; heads 5-iO-flowered; flowers 6-IO mm. 

 long; perianth-parts subulate-lanceolate, the outer keeled, about one-third shorter 

 than the inner; stamens 3; filaments longer than the yellow anthers; capsule subu- 

 late, beakless, about as long as the outer perianth-parts, 3-celled; seed oblong, acute 

 at either end, finely reticulate. In swamps and streams, Del. to Fla., Cuba and 

 Tex., and in Lower Cal. 



20. Juncus castaneus Smith. CHESTNUT RUSH. (I. F. f. 938.) Stems 

 erect, 1-5 dm. high, terete, leafless, or with a single leaf, arising singly from a 

 slender rootstock. Basal leaves 3-5, the outer sheaths short, loose, the inner clasp- 

 ing, their blades tapering to a slender channeled acutish apex; inflorescence strict, 

 usually exceeded by its lowest bract; heads 1-3. 3- 1 2 -flowered; pedicels 12.5 mm - 

 long; perianth brown or black, 4-7 mm. long, its parts lanceolate, acute; anthers 



