538 JCNCACE.E. (RUSH family.) 



broad filaments ; style about the length of the ovary ; seeds rather large ($" oi 

 more long), nearly obtuse, delicately ribbed and cross-lined. — Sandy shores of 

 New England, the Great Lakes, and westward ; also in swamps, Lancaster Co., 

 Penn., Prof. Porter. (Eu.) 



+- ■*- Innermost sheaths leaf-bearing : stamens 6. 



5. J. setaceus, Rostkovius. Scape slender (1°- 3° high) ; panicle loose, 

 rather few-flowered ; flowers greenish (2" long) ; sepals lanceolate, sharp-pointed, 

 especially the 3 shining exterior ones, spreading in fruit, as long as the nearly 

 globose beak-pointed greenish or light-brown pod ; anthers as long as filaments; 

 style conspicuous; seeds (%" long) almost globose, ribbed and cross-lined. — 

 Pennsylvania (Rostkovius), Virginia ? and North Carolina, southward near the 

 coast. — Doubtful if in our district. 



* * Flowers in clusters, S-androus : innermost sheaths at base of stem leaf-bearing. 



6. J. Rcemerianus, Scheele. Scape stout and rigid (2° -3° high), its 

 apex as well as the leaves pungent ; panicle compound ; 3 - 6 greenish or light- 

 brown flowers (1^" long) in a cluster; outer sepals lanceolate, sharp-pointed, 

 longer than the obtusish inner ones, as long as the elliptical rather triangular 

 obtuse short-pointed brown pod ; anthers much longer than the broad filaments ; 

 styles shorter than the ovary ; seeds (£" long) oval, obtuse, very delicately ribbed. 

 (J. maiitimus of Amer. authors.) — Brackish marshes, New Jersey (Pursh), 

 Virginia and southward. 



§ 2. Grass v-leaved Junci ; with simple or rarely branched stems, leafy at base 

 or throughout : leaves flat, or somewhat terete or setaceous and channelled, never 

 knotted: panicle terminal. 



* Flowers crowded in heads (produced in late summer). 



■*- Leaves thread-like, hollow : stems simple : heads single or few : seeds large, the 



loose seed-coat produced into conspicuous tails : stamens 6. 



7. J. st#"gius, L. Stems slender (6' -16' high) from slender branching 

 rootstocks, 1-3-leaved below, naked above; heads 1 or rarely 2, of 3 - 4-flowers, 

 about the length of the sheathing scarious awl-pointed bract; flowers pale and 

 reddish (2^"-3" long) ; sepals lanceolate, the inner obtusish, f the length of 

 the oblong acuminate pod, as long as the slender stamens ; filaments many 

 times longer than the oblong anthers ; recurved stigmas shorter than the style ; 

 seeds oblong, with a very loose slightly striated coat prolonged at both ends 

 (l%" long). — Peat-bogs bordering Perch Lake, Jefferson County, New York. 

 N. Maine, G. L. Goodale. (New Brunswick, Mr. Fowler. North shore of Lake 

 Superior, Mr. Wheeler.) — Flowers larger and pod more abruptly pointed than in 

 the European plant. (Eu.) 



8. J. trifldus, L. Stems densely tufted from matted creeping rootstocks, 

 erect (5' -10' high), sheathed and mostly leafless at the base, 2-3-leaved at 

 the summit, the upper thread-like leaves subtending the sessile head of 1-4 

 brown (l£" - 2" long) flowers ; sepals ovate-lanceolate, acute, equalling or rather 

 shorter than the ovate beak-pointed deep brown pod ; anthers much longer than 

 the filaments; seeds few, oblong, angled (1" long), faintly striate, short-tailed. 

 — Alpine summits of the mountains of New England, and N. New York, and 

 high northward. (Eu.) 



