JUNCACEAE (RUSH FAMILY) 111 



slender, from a slender horizontal rootstock, somewhat compressed, 2-5 dm. 

 high: leaves very narrow, subterete; ligules present: spathe short and very 

 narrow: heads small, few to rather many in a short open panicle, frequently 

 solitary: perianth-segments brownish, lanceolate, acuminate, 4 mm. long: 

 stamens 6; anthers longer than the filaments: stigmas long-exserted : capsule 

 oblong, abruptly contracted into the stout style, which nearly equals the 

 perianth: seeds minute, oblong, apiculate at each end. From the Rocky 

 Mountains to the Sierras. 



8. Juncus Tweedyi Rydb. Mem. N. Y. Bot. Card. 1: 90. 1900. Stem 

 about 3 dm. high, strict, light green, 2-3 mm. in diameter: leaves terete or 

 slightly flattened, more or less distinctly septate, with conspicuous scarious 

 sheaths, the basal ones short; stem leaves, except the upper ones, about 1 dm. 

 long: heads in a contracted panicle, brown and shining, 5-8-flowered: perianth- 

 segments subequal, about 4 mm. long, narrowly lanceolate, acute or acumi- 

 nate : bracts ovate, cuspidate-acuminate : stamens 3, about two thirds as long 

 as the perianth; anthers much shorter than the filaments: style rather short: 

 capsule dark brown and shining, oblong, acute, sharply 3-angled, about one 

 fourth longer than the perianth: seeds light-colored, about 1 mm. long, tailed 

 at both ends. J. canadensis coarctatus. Yellowstone Park. 



9. Juncus triglumis L. Sp. PI. 328. 1753. Stems 5-15 cm. high, some- 

 what tufted on a branching rootstock, erect, terete: leaves radical, subulate, 

 somewhat terete, channeled at base: flowers capitate, in a terminal erect 

 mostly 3-flowered head, the lowest 2 or 3 bracts nearly equal, divergent, about 

 as long as the flowers: perianth-segments rather obtuse, shorter than the ob- 

 long obtuse mucronate capsule: filaments many times longer than the capsule: 

 seeds oblong, abruptly contracted into long slender tails. High mountains in 

 our range and across the continent far northward. 



10. Juncus castaneus Smith, Fl. Brit. 1: 383. 1800. Stems erect, 1-4 dm. 

 high, terete, leafless or nearly so: basal leaves 2-4, rather short, tapering from 

 an involute tubular base to a slender channeled acutish apex: heads 1-3, few- 

 flowered, brown or black: perianth-segments lanceolate, 5-6 mm. long: sta- 

 mens nearly as long; the anthers about 1 mm. long: capsule brown, narrowly 

 oblong, acute, much longer than the perianth: seeds' contracted into long 

 slender tails. Range of the preceding. 



11. Juncus longistylis Torr. Bot. Mex. Bound. 223. 1859. Stems 3-5 dm. 

 high, caespitose, stoloniferous, terete, somewhat minutely scabrous above, 

 leafy: leaves flat, grass-like: heads few, clustered in a contracted panicle, 3-5 

 cm. long, or rarely single, 3-12-flowered: flowers 5-6 mm. long, the larger ones 

 greenish, with brown striae, smooth, pediceled: sepals equal, ovate-lanceolate, 

 very acute or cuspidate, twice longer than the stamens: ovary equaling the 

 stamens and style; stigma exserted: capsule ovate, obtuse, mucronate or 

 rostrate, chestnut-colored, shining, 3-celled, equaling or a little longer than 

 the calyx: seeds oblanceolate or obovate, acute at each end, costate-reticulate. 

 Frequent throughout our range. 



12. Juncus orthophyllus Coyille, Contrib. U. S. Nat. Herb. 4: 207. 1893. 

 Stems 3-8 dm. high, from creeping rootstocks: leaves flat, about 2 mm. wide, 

 pale green, shorter than the sheaths, with ligules: heads panicled few-flowered: 

 perianth-segments straw-color, lanceolate, acuminate, scarious-margined, 

 rough, 7 mm. long: stamens 6: capsule triangular, oblong, acute, short- 

 beaked. Mostly to the northwest of our range. 



13. Juncus marginatus Rostk. Monog. June. 38. 1801. Tufted, 1.5-7.5 

 dm. high from branching rootstocks: leaf -sheaths auricula te ; blades 1-3 mm. 

 broad, 2-4 conspicuous veins in addition to the midrib: inflorescence 1 dm. 

 high or less, the panicle composed of 2-20 tubinate to subspherical 5-10- 

 flowered heads: perianth 2.5-3.5 mm. long, the outer parts ovate, acute, the 

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

 much shorter than the filaments: capsule equaling the perianth, obovoid, 

 truncate or retuse, almost 3-celled, the placentae deeply intruded: seed ob- 

 long, 0.4-0.5 mm. long, pointed at either end, 12-16-ribbed. Colorado to the 

 Atlantic States. 



