544 JUNCACE^. (RUSH FAMILY.) 



20. J. alpinus, Villars, var. insignis, Fries. Stems erect (9-18' high) 

 from a creepiug rootstock, with 1 or 2 sleuder leaves ; panicle meagre, with 

 erect branches bearing distant greenish or light-brown heads, each of 3-6 

 flowers (1:1 - H" long) ; sepals oblong, obtuse, the outer mucronate or cuspi- 

 date and usually longer than the rounded inner ones, as long as or shorter 

 than the obtuse short-pointed incompletely 3-celled light-Vn-own capsule ; an- 

 thers as long as the filaments; style short; seeds (j" or more in length) 

 spindle-shaped. — Wet sandy banks, L. Champlain, Cayuga Lake, along the 

 Great Lakes, and far west and northward. (Eu.) 



21. J. militaris, Bigel. Stem stout (2-4° high) from a thick creepiug 

 rootstock, bearing a solitary stout erect leaf (-^-3^° long) below the middle, 

 which overtops the crowded and rather contracted panicle ; heads numerous, 

 5-12- (rarely 25-) flowered ; flowers brownish (1|" long) ; sepals lanceolate, 

 the outer awl-pointed, as long as the ovate-oblong triangular taper-beaked 

 1 -celled capsule ; anthers longer than the filaments; ovary attenuate into a 

 slender style ; seeds {^- g" long) globose-obovate, obtuse, abruptly pointed. — 

 In bogs and streams, ^Nlaine to Md. Sometimes producing, in flowing water, 

 numberless capillary submersed leaves, 2-3° long, from the rootstock. 



f+ t-*- Stamens 3. 



22. J. acuminatus, Michx. Stems tufted, erect, slender (1-2° long), 



bearing about 2 leaves and a very loose spreading panicle ; heads rather few 

 and large, 5 - many-flowered, greenish, at length straw-colored or darker ; se- 

 pals lauce-awl-shaped, sharp-pointed, equal (1^-2^' long), as long as the trian- 

 gular-prismatic short-pointed 1-celled straw-colored or light brown capsule; 

 anthers a little shorter than the filaments; style almost none; seeds small 

 (j-^" long), acute at both ends, ribbed-reticulated. — N. Eng. to Ga., Minn, 

 and Tex. ]May, June. Very variable. Heads often proliferous in autumn. 



Var. debilis, Engelm. Stems slender (9-18' high); heads green, 3-6- 

 flowered, in a loose panicle; flowers smaller (1^-1-^" long) ; capsule longer 

 than the sepals. — Wet sandy soil, N. J. to S. C., west to Ohio, Mo., and Miss. 

 Stem sometimes decumbent and rooting. 



Var. robustUS, Engelm. Stems stout, tall (2-4° high), bearing numer- 

 ous 5 - 8-flowered light-brown heads in a large much-branched panicle ; flow- 

 ers small (1 - 1|" long) ; ovoid capsule scarcely longer than the sepals. — Deep 

 swamps. 111. to Mo. and La. 



-J- I- 1- Heads Jew, crowded, of numerous flowers. 



++ Stamens 3 ; stem rigid from a thick ivhite horizontal rootstock 



23. J. brachycarpus, Engelm. Stem erect (1 - 2i° high), bearing 

 about 2 leaves and 2-10 densely flowered spherical heads (4-5" wide) in a 

 slightly spreading crowded panicle much exceeding the involucral leaf ; flow- 

 ers pale green (2" long) ; sepals lance-linear, awl-pointed, the 3 outer much 

 longer than the inner, and the ovoid pointed 1-celled capsule rather shorter; 

 anthers much shorter than the filaments ; style very short ; seeds (^" long) 

 abruptly apiculate. — Moist places in open woods and prairies, Ohio and Mick 

 to Mo., Miss., and Tex. 



24. J. scirpoides, Lam. Stem erect (1 -3° high), rather slender, bear- 

 ing about 2 terete leaves with wide and open sheaths, and a panicle of few or 



