JUncace^. (rush family.) 543 



iii<^ in fruit, as long as the o-lobular beaked light mahogany-colored capsule, 

 anthers nearly as long as the fihinieuts ; style short ; seeds small (i - 1" long), 

 coarsely cross-lined. — Low sandy grounds, N. J. to Fla. 



16. J. Gerardi, Loisel. (Black-Grass.) Stems scarcely flattened, rigid 

 (1 -2° higli) ; panicle contracted, usually longer than the bracteal leaf; flow- 

 ers chestnut-brown with green (If" long) ; sepals oval-oblong, obtuse, incurved, 

 as long as the oval obtuse and mucronate capsule ; anthers much longer than 

 the short filaments ; style as long as the ovary; seeds (nearly -i" long) obo 

 ^^ate, delicately ribbed and cross-lined. — Salt marshes; common along the 

 coast and in W. New York ; rare about the Great Lakes. ( Eu. ) 



•«- •«- Stems branched, diffuse, leafy ; root annual, fibrous. 



17. J. bufonius, L. Stems low and slender (3-9' high), leafy, often 

 branched from the base; panicle spreading, mostly with one-sided dichoto- 

 mous branches; flowers remote, greenish (2-3^" long) ; sepals linear-lanceo- 

 late, awl-pointed, the 3 outer much exceeding the inner and the oblong ob- 

 tuse capsule ; stamens short ; filaments scarcely longer than the anthers . seeds 

 elliptical, obtuse (^-^'^ long). — Low grounds, by roadsides; common. (Eu.) 



§ 3. Stems leafji; leaves terete or lateral/// fiattened, more or less distinctlij knot- 

 ted by internal transverse partitions ; panicle terminal, with fioucers chiefly 

 in heads. — Knotty-leaved Jcnci. 



* Seeds barel/j pointed, not caudate. 



H- Flowers solitary or 2 together, panicled ; stamens 6. 



18. J. pelocarpus, E. Meyer. Stems slender and erect from a slender 

 running rootstock (6-18' high), bearing few thread-like slightly knotted 

 leaves, branching above into a compound spreading panicle, bearing the flow- 

 ers in the forks and along one side of the branches ; often with the floAvers or 

 in place of them are tufts of leaves; flowers small {\-\\" long), greenish with 

 red ; sepals oblong, obtuse, the 3 inner ones longer, but shorter than the ob- 

 long taper-beaked, 1-celled capsule; anthers much longer than the filaments; 

 style slender ; seeds (J" long) obovate, short-pointed. — Sandy, wet or swampy 

 places, Newf. to Fla., west along the Great Lakes to Minn. The proliferous 

 plants are usually sterile and much larger, with larger diffuse panicles.— 

 Var. suBTiLis, Engelm. Creeping or floating, with a single pair of flower* 

 at the end of the short stems. — Somerset Co., Maine {C. E, Smith) ; Canada. 



-»- •»- Heads numerous, of ^-\2-floicers {rarely more) ; in early summer 



•w- Stamens 6. 



19. J. articul^tus, L. Stems ascending or erect (9-1.5' high), tuftet 

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

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

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

 a little longer, shorter than the ovate-oblong acute or alirnptly mucronate- 

 poiiited incompletely 3-celled commonly deep chestnut-brown shining capsule; 

 anthers as long as the filaments ; ovary attenuate into a short style ; seeds 

 ^less than ^" long) obovate, attenuate below, abruptly pointed above. — Wet 

 5;x0unds, Newf. to Del., west to western N. Y. and Mich. (Eu.) 



