540 JUNCACE^E. (RUSH FAMILY.) 



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

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

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

 the ovoid refuse scarcely pointed green pod ; anthers nearly equal to the fila- 

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

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

 — Var. secuxdl's is a smaller plant, with smaller one-sided flowers on the ^ 

 forked brandies of the panicle. New England to Pennsylvania. 



14. J. diehotomus, Ell. Stems rigid (l^°-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" 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 (\" -*" long), white-pointed 

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

 Parker), Delaware (Prof. Lehly, 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 (1|" long) ; sepals lanceolate, acute, 

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

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

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

 England, and on the Great Lakes near Detroit (Holzer, J. M. Bigelow). 



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, appressed, shorter than the oblong and retuse 

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

 slender, conspicuously tailed at both ends (j"-jj" long), closely ribbed. — 

 Michigan, with the last (near Detroit, Llolzer, Bigelow) to N. Illinois (Vasey), 

 and westward. June. 



§3. K»OTTr-LEAVED Jinci ; stems leafy, simple or branching: leaves terete 

 or sometimes laterally compressed, knotted by internal cross-partitions : panicle 

 terminal, with flowers chiefly in heads. 



* Seeds barely pointed, without tails. 

 -t- Heeids composed of '2 or sometimes only single G-androus flenoers. 



17. J. pelocarpus, E. Meyer. Stems slender and erect fipm a slender 

 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-flowered heads; often with the 

 flowers or in place of them are tufts of leaves ; flowers small (l'-lj' long), green- 

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

 oblong taper-beaked I -celled pod ; anthers much longer than the filaments; style 

 Blender; seeds (i" long) obovate, short-pointed, delicately ribbed-reticulated. 

 (J. vivi'parus, Conrad. J. Conradi, Tuckerm.) — Sandy, wet or swampy places, 



