544 JUNCACE^E. (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 - 1-^" long) ; sepals oblong, obtuse, the outer mucrouate or cuspi- 

 date aud usually longer than the rounded inner ones, as long 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. Champlaiii, 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 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 (14-" 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 iuto a 

 slender style ; seeds (| - g " long) 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. 



in- *-< 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, 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 

 (7- 1" 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-J" 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 - \\" long) ; ovoid capsule scarcely longer than the sepals. Deep 

 swamps, 111. to Mo. and La. 



t- <- *- Heads few, crowded, of numerous /lowers. 

 t-t- Stamens 3 ; stem rir/id front a thick white horizontal rootstock. 



23. J. brachycarpus, Engelm. Stem erect (1 - 24- 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 (I" long) 

 abruptly apiculate. Moist places in open woods 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 



