54:0 JUNCACE^. (rush family.) 



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

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

 (2'' or more long) ; sepals lanceolate, very acnte, s])reading in fruit, longer tlian 

 the ovoid i-etusc scarcely pointed green pod ; anthers nearly equal to the flla- 

 mcnt; style very short; seeds small (about i" long), white-pointed at both ends, 

 delicately ribbed and cross-lined. — Low grounds, flelds, and roadsides. (Eu.) 

 — Var. SECUNDiTs is a smaller plant, with smaller one-sided flowers on the 

 forked branches of the panicle. New England to Pennsylvania. 



14. J. dichotomus, Ell. Stems rigid (l^°-2° high) from a tumid 

 base; leaves fililorm, nearly terete, slightly grooved on the inner side; panicle 

 loose, often with 1-sided tbrked branches, mostly longer than tiie involucral leaf; 

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

 in fruit, as long as the globular beaked light mahogany-colored pod; anthers 

 nearly as long as filaments ; style short ; seeds small (\"-i" long), white-pointed 

 at both ends, coarsely cross-lined. — Low sandy grounds, New Jersey (C F. 

 Paikf-r), Delaware [Prof. Lf.idy, Mr. Commons), and southward. 



15. J. Gre6nii, Oakes & Tuckerm. Stems rigid (l°-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 crowded flowers often one-sided (li|" long) ; sepals lanceolate, acute, 

 light grccnisii-brown, apprcssed, shorter than the ovoid-oblong obtuse greenish- 

 brown pod; anthers as long as filaments; style very short; seeds ovoid, tail- 

 pointed (J" - f " long), ribbed and delicately cross-lined. — Sandy coast of New 

 England, and on the Great Lakes near Detroit {Uolzer, J. M. Biijelow). 



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

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

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

 long) ; sepals lanceolate, acute, appresscd, shorter than the oblong and retnse 

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

 slender, conspicuously tailed at both ends {h" -V long), closely ribbed. — 

 Michigan, with the last (near Detroit, llulzer, Bit/r/ow) to N. Illinois ( Va.'^eij), 

 and westward. June. 



§.3. Knottv-leaved Jun'CI ; stems leaf}/, simplfi. or hranchinq : leaves terete 

 or sometimes Idterallij compressed, knotted In/ inttrnal cross-part itiuns : panicle 

 terminul, loith flowers c/iiefli/ in heads. 



* Seeds barely pointed, without tails. 

 •t- Heads composed of 2 or sometimes onhj simjle G-androus flowers. 



17. J. pelocarpus, E. Meyer. Stems slender and erect from a slende^ 

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

 branching above into a compound spreading panicle, bearing in the forks and 

 along one side of the branches single flowers or 2-flowercd heads ; often with the 

 flowers or in place ot them arc tufts of leaves ; flowers small (1'- 1 i' long), green- 

 ish with red ; sepals oblong, obtuse, the 3 inner ones longer, but shorter than the 

 oblong tajjer-beakcd l-ccllcd pod ; anthers much longer than the filaments ; style 

 slender; seeds (J" long) obovate, short-pointed, delicately ribbed-rcticidatcd. 

 (J. viviparus, Conrad. J. Conrkdi, Tuckerm.) — Sandy, wet or swampy places 



