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. suutilis (J. flui- 

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

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

 •»- +- Hauls 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 rootstoek, with 1 or 2 slender leaves; panicle short, 

 spreading; the crowded heads 3 - 8-flowered ; flowers brown, rarely pale ( 1 j" - 

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

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

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

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

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

 poca'rpus, Ehrh.) — Wet grounds, New England to Western New York and 

 Delaware. (Eu.) — Var. obtusAtus. Panicle crowded, level-topped ; heads 

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

 obtuse, mucronate. — Petty's Island, near Philadelphia, Dr. Difftnbaugh, Mr. 

 Burke. 



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

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

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

 (U" -1 i" 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 (J" 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 (Bobbins, Macrae,) and along the Great 

 Lakes northward and westward. (Eu.) 



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

 rootstoek, 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 (H" 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 ( J" - J" long) globose-obovatc, obtuse, abruptly pointed, ribbed-reticulated. 

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

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

 2° -3° long, from the rootstoek. 



++ ++ 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; stvle almost none; seeds small (\" - {" long), 



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