542 jUNCACEiE. (rush family.) 



ered ; flowers green (3" long) ; sepals rigid, lauce-subulate, slender-pointed, 

 the 3 outer as long as the linear triangular obtuse capsule, the inner much 

 longer ; stamens as long as the outer sepals ; filaments many times longei 

 than the oblong anthers ; seeds small (i" long), obovate, slightly pointed, very 

 delicately ribbed and cross-lined. — Miry banks, ^Nld. to Fla. and La. 



11. J. marginatUS, Eostk. Stem erect, from a bulbous and stoloniferous 

 base (1-3° high); leaves long-linear ; heads 3-8-flowered, pauicled; flowers 

 purplish with green (l^" long) ; sepals oblong, the 3 outer acute and slightly 

 awned, the inner longer, mostly obtuse, as long as the almost globular scarcely 

 mucronate capsule ; stamens exceeding the outer sepals ; purple anthers shorter 

 than the filaments; style very short; seeds (^-^^long) slender, pointed at 

 both ends and strongly ribbed. — Moist sandy places, S. New Eng. to Fla., west 

 to Mich., Mo., and Tex. — Var. paucicapitXtl'S, Engelm., has few large 8- 

 15-flower8d heads; and var. bifl6rus, Engelm., has numerous small 2-3 

 flowered heads in much-branched panicles. 



* * Flowers solitary, lianicled ; stamens 6. 



■*- Stems slender, simple, tufted, leafy below ; root perennial (Ji. early in sum mer) . 



•«H- Seeds tail-pointed at both ends. 



12. J. Vaseyi, Engelm. Stems rigid (1 -2|° high) ; leaves nearly terete, 

 very slightlv channelled on the inner side ; panicle longer than the involucral 

 leaf, loose; flowers few, often one-sided, greenish or light brown (2'' long or 

 more) ; sepals lanceolate, acute, appressed, shorter than the oblong and retuse 

 green-brown capsule ; anthers as long as the filaments ; style very short ; seeds 

 slender (i- f long), closely ribbed. — N. Maine {Pringle) ; ]\Iich. to Iowa and 

 westward. 



13. J. Greenii, Oakes & Tuckerm. Stems rigid (1 - 2° high) ; leaves 

 nearly terete, very deeply channelled (almost involute) on the inner side ; pan- 

 icle usually much shorter than the principal erect involucral leaf, dense, the 

 numerous flowers often one-sided (If" long); sepals lanceolate, acute, light 

 greenish-brown, appressed, shorter than the ovoid-oblong obtuse greenish-brown 

 capsule ; anthers as long as the filaments ; style very short ; seeds ovc^d (j-f" 

 long), ribbed and delicately cross-lined. — Sandy coast of N. Eng., N. Y., and 

 N. J., and about the head of Lake Michigan. 



•^ ++ Seeds merely apicidate at both ends. 



14. J. tenuis, Willd. Stem wiry (9-18' high) ; leaves flat or channelled ; 

 panicle shorter than the involucral leaves, loose, or rarely crowded; flowers 

 green (2'' long or more) ; sepals lanceolate, very acute, spreading in fruit, 

 longer than the ovoid retuse scarcely pointed green capsule ; anthers nearly 

 equal to the filaments ; style very short ; seeds small (about ^" long), delicately 

 ribbed and cross-lined. — Fields and roadsides, very common. (Eu.) — Var. 

 SECUNDUS, Engelm. ; flowers smaller, secund along the incurved branches. 

 N. Eng. to Penn. and Del. — Var. congestus, Engelm. ; branches contracted 

 into a head and the flowers darker-colored. Minn, and westward. 



15. J. dichotomus, Ell. Stems rigid (11-2° high) from a tumid base; 

 leaves filiform, nearly terete, slightly grooved on the inner side ; panicle loose, 

 often with 1 -sided forked branches, mostly longer than the involucral leaf; 

 flowers greenish (2" long or more) ; sepals lanceolate, sharp-pointed, spread 



