47 8 



JUNCACEAE. 



Vol. I. 



34. Juncus alpinus Vill. Richardson's Rush. Fig. 1199. 



/. alpinus Vill. Hist. PI. Dauph. 2: 233. 1787. 

 /. Richardsonianus Schult. in R. & S. Syst. 7: 201. 1829. 

 Juncus alpinus var. insignis Fries ; Engelm. Trans. St. Louis 

 Acad. 2 : 458. 1866. 



Stems erect, 6-20' high in loose tufts, from creeping 

 rootstocks, 1-2-leaved; stem leaf or leaves usually borne 

 below the middle; panicle 2i'-8' high, sparse, its 

 branches strict or slightly spreading; heads 3-12-flow- 

 ered; perianth i"-ii" long, the inner parts shorter 

 than the outer, obtuse, usually purplish toward the 

 apex, the three outer paler, obtuse, mucronate or acute; 

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

 anthers much shorter than the filaments; capsule ovoid- 

 oblong, slightly exceeding the perianth, straw-color or 

 brown, broadly acute or obtuse, with a short tip; seed 

 about i" in length, narrowly obovoid to oblong, apicu- 

 late, acute or acuminate at the base, lightly reticulate 

 in about 20 rows, the areolae finely cross-lined. 



Greenland to British Columbia, south to Pennsylvania, Nebraska and Washington. 



35. Juncus nodosus L. Knotted Rush. 



Juncus nodosus L, Sp. PI. Ed. 2, 466. 1762. 



Stems 6%2° high, erect, arising singly from tuber- 

 like thickenings of a slender, nearly scaleless rootstock; 

 stem leaves 2^-4, and like the basal ones with long erect 

 blades, the upper overtopping the inflorescence; panicle 

 shorter than its lowest bract, seldom exceeding 2i', 

 bearing 1-30 heads ; heads spherical, several-many- 

 flowered, 3V-6" in diameter; perianth it"-il" long, its 

 parts lanceolate-subulate, usually reddish brown above, 

 the inner longer than the outer; stamens 6, about one- 

 half as long as the perianth; anthers equalling the fila- 

 ments; capsule lanceolate-subulate, 3-sided, i-celled, 

 exceeding the perianth; seed oblong, acute below, 

 apiculate above, rarely more- than i" long, reticulate in 

 20-30 rows, the areolae finely cros&-lined. 



Nova Scotia to Virginia, Nebraska and British Columbia 

 Also in Nevada. 



36. Juncus Torreyi Coville. Torrey's Rush 



1200. 



1201. 



Juncus Torreyi Coville, Bull. Torr. Club 22 : 303. 1895. 

 /. nodosus var. megacephalus Torr. Fl. N. Y. 2: 326. 1843. 

 Juncus megacephalus Wood, Bot. Ed. 2, 724. 1861. Not 

 /. megacephalus M. A. Curtis, 1835. 



Stems 8-40' high; rootstock slender, with tuberiform 

 thickenings at intervals, each supporting a single stem; 

 stem stout, 1-4-leaved; blade stout, terete, s"-i' thick, 

 abruptly divergent from the stem; inflorescence con- 

 gested, consisting of 1-20 heads, exceeded by its lowest 

 bract; heads s"-8" in diameter; perianth / z"-2\" long, 

 its parts subulate, ' the outer longer than the inner ; 

 stamens 6, about half as long as the perianth; capsule 

 subulate, 3-sided, i-celled, its beak i"-i" long, exceeding 

 the perianth and holding the valves together throughout 

 dehiscence; seed \"-\" in length, oblong, acute at both 

 ends, reticulate in about 20 longitudinal rows, the 

 areolae finely cross-lined. 



Wet soil, Massachusetts to Ontario, Saskatchewan, Wash- 

 ington, Alabama, Texas and Arizona. 



