544 JUNCACE^. (rush family.) 



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

 from a creeping rootstock, with 1 or 2 slender leaves; panicle meagre, with 

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

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

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

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

 thers as long as the filaments; style short; seeds (^" 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 creeping 

 rootstock, bearing a solitary sUmt erect leaf (i-SP long) behnv the middle, 

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

 5-12- (rarely 25-) flowered ; flowers brownish (l^'^long), sepals lanceolate, 

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

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

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

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

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



++ -i-h 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 lance-awl-shaped, sliarp-poiuted, 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 

 (^-|" 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. 



Vav. robustus, Engelm. Stems stout, tall (2-4° high), bearing numer- 

 ous 5 - 8-tiowered 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. 



4- -1- -4- Ueods few, croicded, of nnmerous flowers. 



++ Stamens 3 ; stem rigid from a thick white horizontal rootstock. 



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

 about 2 leaves and 2-10 densely floAvered 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 (1" long) 

 abruptly apiculate. — Moist places in open Avoods and prairies, Ohio and Mich, 

 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 



