388 JUNCACEAE. 



Juncus marginatus Rostk. Grass-leaved Rush. (Fig. 935.) 



Juncus maroina/itsRosik.. Monog. June. 38./>/. 2.f.j. 1801. 

 Juncus marginatus var. paucicapitatus Engelni/ Trans. 

 St. Louis Acad. 2: 455. 1866. 



Stems erect, tufted, 6'-3o' high from branching 

 rootstocks, somewhat bulbous at the base, compressed, 

 2-4-leaved. Leaf-sheaths auriculate; blades ^"-i^" 

 broad, 2-4 conspicuous veins in addition to the mid- 

 rib; inflorescence 4' high or less, the panicle com- 

 posed of 2-20 turbinate to subspherical 5-io-flowered 

 heads; perianth i%"-i%" long, the outer parts ovate, 

 acute, the inner slightly longer, obovate, obtuse, with 

 hyaline margins; stamens 3, nearlj* as long as the peri- 

 anth; anthers ovate, reddish brown when dry, much 

 shorter than the filaments; capsule equalling the peri- 

 anth, obovoid, truncate or retuse, almost 3-celled, the 

 placentae deeply intruded; seed oblong, \"~W long, 

 pointed at either end, i2-:6-ribbed. 



Grassy- places, Maine to Ontario, Florida and Nebraska. 



Juncus marginatus aristulatus (Michx.) Coville, Proc. Biol. Soc. Wash. 8: 123. 1893. 

 Juncus aristulatus Michx. Fl. Bor. Am. i: 192. 1803. 

 Juncus marginatus var. biflorus Wood, Classbook, Ed. 2, 725. 1861. 



Taller, sometimes 3^ high; leaf-blades i"-2l-2" broad: heads usually 20-100, mostly 2-5-flow- 

 ered. New York to Florida and Mexico, mostly near the coast; Mississippi Valley to Michigan. 



Juncus marginatus setosus Coville, Proc. Biol. Soc. Wash. 8: 124. 1893. 

 Inner penanth-parts ovate or lanceolate, acute or acuminate; seeds smaller. Kansas to Mexico. 



18. Juncus longistylis Torr. Long-styled 

 Rush. (Fig. 936.) 



Juncus longistylis Torr. Bot. Mex. Bound. 223. 1859. 



Stems erect, loosely tufted, 8'-3o' high, rather stiff, 

 slender, compressed, i-3-leaved, the leaves mostly below 

 the middle. Leaf blades }i"-\yt.' f wide, acute, striate, 

 the midrib well defined; inflorescence 2' high or less, 

 usually of 2-10 irregular 3-8-flowered heads, or reduced 

 to a single larger one; perianth 2^ // -3 // long, the parts 

 equal, brown, lanceolate, acuminate, with hyaline mar- 

 gins; stamens 6, half to two-thirds as long as the peri- 

 anth, the yellow linear anthers longer than the filaments; 

 style about }&" long; stigmas i // -i^ // long; capsule 

 shorter than the perianth, oblong, brown, angled above, 

 obtuse or depressed at the summit, mucronate, 3-celled; 

 seed oblong, white-tipped, about %" long, i4-2o-ribbed. 



Western Nebraska and the Rocky Mountain region. 



19. Juncus repens Michx. Creeping Rush. (Fig. 937.) 



Juncus repens Michx. Fl. Bor. Am. i: 191. 1803. 



Perennial by prostrate rooting branches; stems tufted, 

 compressed, ascending, floating or prostrate, 2 / -2o / long. 

 Leaves with compressed sheaths 10" in length, auricu- 

 late, the blades \ f ~z l /^ f long, ^"-i" broad, filiform-acu- 

 minate; inflorescence of i-S heads, one or more heads 

 often occurring also at the lower nodes; heads 5-10- 

 flowered; flowers 3 // ~5 // long, the outermost slightly 

 recurved; perianth-parts subulate-lanceolate, the outer 

 keeled, about one-third shorter than the inner; stamens 

 3, half to one third the length of the perianth; filaments 

 longer than the yellow anthers; capsule subulate, beak- 

 less, about as long as the outer perianth-parts, 3-celled, 

 the valves membranous, breaking away from the axis in 

 dehiscence; seed oblong, acute at either end, '- 

 long, finely reticulate in 25-40 longitudinal rows.. 



In swamps and streams, Delaware to Florida. Cuba and 

 Texas, and in Lower California. 



