392 



JUNCACEAE. 

 29. Juncus nodosus L. Knotted Rush. (Fig. 947.) 



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



Stems 6 r -2 high, erect, arising singly from tuber- 

 like thickenings of a slender, nearly scaleless root- 

 stock; 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 -2%', bearing 1-30 heads; heads 

 spherical, several-many-flowered, 3^ // -6 // in di- 

 ameter; perianth i // -i|^ // long, its parts lanceo- 

 late-subulate, usually reddish brown above, the 

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

 half as long as the perianth; anthers equalling the 

 filaments; capsule lanceolate-subulate, 3-sided, i- 

 celled, exceeding the perianth; seed oblong, acute 

 below, apiculate above, rarely more than \" long, 

 reticulate in 20-30 rows, the areolae finely cross- 

 lined. 



Xova Scotia to Virginia, Nebraska and British Colum- 

 bia. Also in Nevada. 



30. Juncus Torreyi Coville. Torrey's Rush. (Fig. 948.) 



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

 J. nodosus var. megacephaltisforr. Fl. N. Y. 2: 326. 1843. 

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



J. megacephalus M. A. Curtis, 1835. 



Stems S'-vjo' high; rootstock slender, with tuberi- 

 form thickenings at intervals of a few centimeters, 

 each supporting a single stem; stem stout, i-4-leaved; 

 blade stout, terete, $"-1' thick, abruptly divergent 

 from the stem; inflorescence congested, consisting of 

 1-20 heads, exceeded by its lowest bract; heads 5 f/ -8" 

 in diameter; perianth 2 // -2j^ // 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 }/z' f -}' f long, exceeding the peri- 

 anth and holding the valves together throughout de- 

 hiscence; seed \"-%" in length, oblong, acute at 

 both ends, reticulate in about 20 longitudinal rows, the 

 areolae finely cross-lined. 



Western New York to Texas and the Pacific Coast. 



Juncus Caesariensis Coville. New Jersey Rush. (Fig. 949.) 



/. Caesariensis Coville, Mem. Torr. Club, 5: 106. 1894. 

 Juncus asper Engelm. Trans. St. Louis Acad. 



1868. Not Sauze, 1864. 



Stems 2o'-4o' high, stout, erect, i%" in thickness, 

 slightly roughened; basal leaves few, the uppermost, 

 like the cauline, with inconspicuously articulate 

 sheaths and long erect terete roughened blades; inflor- 

 escence I '-4' high, with spreading branches, its low- 

 est bract with a small blade sometimes i% f long; 

 heads 2-5-flowered; perianth 2 // -2 / I 2 // long, the parts 

 lanceolate-acuminate, stiff, green, striate, the inner 

 longer than the outer; stamens 6, about half as long 

 as the perianth; filaments about equalling the an- 

 thers; style and stigmas long; capsule lanceolate-ob- 

 long, 3-sided, mucronate-acuminate, incompletely 

 3 -celled; seed tailed at both ends, altogether about i" 

 long, the body about \" long, closely striate, almost 

 devoid of transverse lines. 



Sandy swamps of southern New Jersey. 



