56 JUNCACEAE. 



Juncus bufpnius L. Annual, branching from the base, 5-30 cm. tall; leaf 

 blades flat or involute, slender; flowers loosely scattered, usually on but one 

 side of the long branches of the panicle; perianth segments pale, scarious- 

 margined, lanceolate, acuminate; stamens 6; capsule narrowly oblong, with a 

 short blunt beak; seeds very finely reticulate. Everywhere common. 



Juncus sphaerocarpus Nees. Very similar to /. bufonius in all respects 

 save the capsule which is globose. Probably common but rarely collected. 



Juncus dudleyi Wiegand. Densely tufted, stiffly erect, 30-50 cm. high; 

 leaves short, usually less than half as long as the stems; auricles yellowish; 

 panicle rather close, 2-7 cm. long; perianth segments spreading, pale, 45 mm. 

 long, slightly exceeding the 1-celled ovoid capsule. Common in low ground; 

 easily distinguished by the cartilaginous auricles. 



Juncus tenuis Willd. Densely tufted, 15-30 cm. tall; leaves flat or some- 

 what involute, narrow, shorter than the stems; auricles whitish, 1-1.5 mm. 

 long; panicle loose, seldom exceeded by the slender bract; perianth segments 

 lanceolate, pale, 3-4.5 mm. long; capsule ovoid, thin-walled, rounded at the apex, 

 1-celled with 3 parietal placentae; seeds minutely reticulate. Very common. 



Juncus brachyphyllus Wiegand. Stems tufted, stiff, erect, 30-50 cm. high; 

 leaves flat, 1.5-2 mm. broad, only one-fourth to one-third the length of the 

 culms; inflorescence many-flowered, short and rather crowded, usually ex- 

 ceeded by the bracts; perianth-segments subulate, acute; capsule oblong, the 

 triangular apex usually obtuse. Blue Mountains and Craig Mountains, Idaho. 



Juncus confusus Coville. Pale green, tufted, erect, the culms 40-50 cm. 

 high; leaves very narrow, flat or involute, one-half to two-thirds as long as 

 the culms; inflorescence dense, 5-20 mm. long, exceeded by the bracts; 

 perianth-segments lanceolate, acutish, 3.5-4 mm. long, the margins scarious; 

 capsule oblong, the triangular apex retuse. Spangle, Suksdorf. 



Juncus longistylis Tprr. Stems 30-60 cm. high; leaves 15-30 cm. long; 

 bract shorter than the inflorescence; panicle consisting of 5-20 heads, these 

 few-flowered; perianth segments lanceolate, acute or acuminate, pale brown, 

 smooth; stamens 6; capsule oblong, 3-angled above, much shorter than the 

 segments. 



Juncus regelii Buch. Perennial, stoloniferous, pale green; stems smooth 

 or minutely scabrous, 12-50 cm. high, erect; leaves flat, 1.5-2 mm. broad; 

 heads solitary or sometimes 2 or 3, globose, many-flowered; outer perianth seg- 

 ments lanceolate, acute, inner ovate, obtuse, all rough, brown with pale 

 margins; stamens 6; capsule longer than the perianth; seeds linear, tailed at 

 each end. In springy places, rare. 



Juncus orthophyllus Coville. Perennial, with creeping rootstocks; stems 

 leafy, 30-70 cm. tall; leaves flat, 2-3 mm. broad, pale green, shorter than the 

 sheaths, without ligules; flowers aggregated into few-flowered heads, these 

 panicled; perianth segments straw-colored, lanceolate, acuminate, scarious- 

 margined, rough, 5 mm. long; stamens 6; capsule 3-angled, oblong, acute, 

 short-beaked. Common along streams. 



Juncus mertensianus Bong. Stems terete, weak, crowded, 10-30 cm. 

 high, from short creeping rootstocks; leaves 5-15 cm. long, about 2 mm. wide; 

 ligules scarious; heads solitary, globose, dark brown, about 1 cm. broad; 

 perianth segments lanceolate, acuminate, 3 mm. long, exceeding the obtuse 

 capsule. Moist meadows in the Blue Mountains at high altitudes. 



Juncus ensifolius Wiks. Rootstocks thick, creeping; stems leafy, 15-30 

 cm. high; heads few, globose, dark brown or nearly black; perianth segments 

 lanceolate, acuminate, 3 mm. long; stamens 3 (rarely 6); capsule 3-angled, 

 acute, barely exceeding the perianth. In wet places especially in the moun- 

 tains. 



