JUXCACEiE. (rush FAMILY.) 521 



§ 2. Steins jointed, lea/ij : clusters or panicles terminal. 

 * Leaves terete or somewhat flattened , knotted : stamens 3. 



7. J. SCirpoides, Lam. Rigid ; stem stout, erect ,• leaves terete, panicle 

 erect, contracted, tlie few large globose green or brownish heads composed of 

 several more or less distinct smaller ones ; sepals lanceolate-suljulate, as long 

 as the lanceolate tapei'-poiuted 3-angled capsule ; seed ovoid, reticulated, with- 

 out appendages. (J. echinatus, Ell.) — Varies with the smaller more numer- 

 ous and crowded heads conspicuously lobed by the more distinct clusters, and 

 with broader aud shorter sepals and capsules. — Sandy swamps, Florida to 

 North Carolina. July - Sept. — Stem 2° high, from a thick creeeping rhi- 

 zoma. Heads 4"- 7" in diameter. 



8. J. polycephalus, Ell., Michx. in part. Stem tall, virgate, com- 

 pressed near the base ; leaves long, flattened, and often somewhat sword- 

 shaped ; panicle large, widely spreading, the numerous globose many-flowered 

 pale heads sessile, or on loug diverging peduncles ; sepals linear-subulate, 

 shorter than the lanceolate-subulate 3-angled capsule ; seeds oblong, striate, 

 barely pointed. — Ponds and miry margins of streams, Florida to North Caro- 

 lina. July - Sept. — Stem 2° - 4° long. Leaves weak, l°-2° long, sometimes 

 Y wide. 



9. J, braehycarpus, Engelm. Stem erect (1^-2° higli), mostly 2- 

 leaved, heads 2-10, globular, closely mauy-flowered, pale green ; sepals linear- 

 subulate, unequal, the outer ones longer ; capsule ovoid, acute, 1-celled, 

 shorter than the sepals; style very short. — Florida to South Carolina, and 

 westward . 



10. J. diffusissimus, Buckley. Stem leafy (6' -3° long), weak; leaves 

 compressed, knotted ; panicle decompound, widely sjireading, the clusters 

 ."5 - 7-flowered ; sepals equal, lanceolate, acute ; capsule (4" long) oblong-linear, 

 barely acute, twice as long as the sepals ; seeds ovoid obtuse. — New Orleans, 

 Tennessee, and westward. 



11. J. Elliottii, Cliapm. Stem slender, nearly terete; leaves terete, 

 grooved near the base within ; panicle erect, simple or compound ; heads (1" — 

 2" long) .5 - 8-flowered ; sepals ovate-lanceolate, as long as the ovoid obscurely 

 angled olrtuse dark brown capsule ; seeds reddish brown, oblong, striate, with- 

 out ap])eudages. (J. acuminatus, £■//., not of Michx.) — Bogs and ditches, 

 Florida to North Carolina. June -August. Root fibrous, often bearing 

 small tubers. Stem l°-2° high. Heads commonly very numerous. Cap- 

 sule 1" long, shining. 



12. J. acuminatus, Michx. Stems clustered, 3' -2° high; leaves fili- 

 form, terete; panicle simple or compound; clusters few - many-flowered ; 

 sepals subulate-lanceolate ; capsule triangular, acute, equalling or longer than 

 the sepals ; seeds not appendaged. — Low or marshy ground ; common. 



Var. debilis, Engelm. Stems weak, erect or declining, 1° or le.ss long; 

 panicles mostly sinijde; heads 2-5-flowered; sepals shorter than the capsule. 

 — Wet places, chiefly in the upper districts. 



13. J. Canadensis, Gay. Stems clustered; leaves terete; heads few or 

 numerous, in an open or den.se panicle ; sepals linear-lanceolate, acute, the ex- 



