JUNCACE^E. (RUSH FAMILY.) 541 



Canada to Wisconsin, and from New England southward near the coast. 



July, Aug. The proliferous plants are usually sterile and much larger than 



the fertile ones, with larger and more diffuse panicles. Var. stJBTiLis ( J. flui- 



tans, Michx.), from Canada, is a small and creeping or floating form, mostly 



with single 2-flowered heads at the ends of the short stems. 



- -- Heads numerous, of 3- 12 flowers (rarely more in No. 21), in early summer. 



-* Stamens 6. 



18. J. articulatUS, L. Stems ascending or erect (9' -15' high), tufted 

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

 spreading; the crowded heads 3 - 8-flowered ; flowers brown, rarely pale (!$"- 

 l" long) ; sepals lance-oblong, acute or mucronate, or the 3 inner obtuse and a 

 little longer, shorter than the ovate-oblong acute or abruptly mucronate-pointed 

 incompletely 3-celled commonly deep chestnut-brown shining pod; anthers as 

 long as filaments ; ovary attenuated into a short style ; seeds (less than " long) 

 obovate, attenuate below, abruptly pointed above, ribbed-reticulated. (J. lam- 

 pocarpus, Ehrh.) Wet grounds, New England to Western New York and 

 Delaware. (Eu.) Var. OBTUSATTJS. Panicle crowded; level-topped ; heads 

 5-flowered, green ; sepals obtuse, of equal length, the outer mucronate ; pod 

 obtuse, mucronate. Petty's Island, near Philadelphia, Mr. Diffenbaugh, Mr. 

 Burke. 



19. 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 

 (li"-l" long) ; sepals oblong, obtuse, the outer mucronate or cuspidate and 

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

 short-pointed incompletely 3-celled light-brown pod; anthers as long as fila- 

 ments; style short; seeds ($" or more in length) spindle-shaped, ribbed-reticu- 

 lated. (J. pelocarpus, Ed. 1. J. articulatus, var. pelocarpus, Ed. 2.) Wet 

 sandy banks, from Lake Champlain (Robbins, Macrae,) and* along the Great 

 Lakes northward and westward. (Eu.) 



20. 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 (l" long) ; sepals lanceolate, the 

 outer ones awl-pointed, as long as the ovate-oblong triangular taper-beaked 1- 

 celled pod ; anthers longer than filaments ; ovary attenuated into a slender style , 

 seeds (4"-" long) globose-obovate, obtuse, abruptly pointed, ribbed-reticulated. 

 In bogs and streams, Maine to Maryland. Dr. Robbins finds that in flow- 

 ing water, at Uxbridge, Mass., this bears numberless capillary submersed leaves, 

 2 - 3 long, from the rootstock. 



w- -w- Stamens 3. 



21. J. acuminatus, Michx. Stems tufted, erect, bearing about 2 leaves 

 and a loose spreading panicle ; heads few - many -flowered, greenish, at length 

 straw-colored or darker ; sepals lance-awl-shaped, sharp-pointed, equal, as long 

 as or shorter than the triangular-prismatic short-pointed 1-celled pod; anthers 

 a little shorter than the filaments ; style almost none ; seeds small (}" - " long), 



