482 jDNCACE^. (rush family.) 



very acute, one third or one half the length of the prismatic triangular and al> 

 jTiptly acute pod ; seeds tail-pointed at both ends. (J. sylvaticus, Muhl. J. Can- 

 adensis, Gay.) — Peat->bogB, and sandy borders of ponds. — Pods turning deep 

 chestnut-bro\vn. Tails shorter than the body of the seed. 



I- 1- Stamens 6. {Heads chestnut-colored: the pods beroming hlaclcish or brown, and 

 shining: seeds tailless, but sometimes short-pointed at both ends.) 



10. J. articulatlis, L. Stem erect (9'-18' high), and with the 1-3 

 slender leaves slightly compressed; panicle spreading; heads 2 - Q-Jlowered ; sepals 

 lance-oblong, the outer acute, the inner mostly obtuse, usually mucronate, shorter 

 than the ovate-obkmg triangular abruptly mucronate-pointed pod, (J. lamprocarpus, 

 Ehrh., &c.) — Var. pelocAkpus (J. pelocarpus, E. Meyer ^- ed. 1.) is a va- 

 riety with fewer flowers in the head, and rather blunter pods slightly exceeding 

 the sepals. — Wet places, Rhode Island to Lake Huron, and northward: the 

 genuine European form received from Mr. Olney and I>r. Sartwdl. (Eu.) 



11. J. militaris, Eigel. Stem stout (2° -3° high), bearing a solilary 

 cylindrical bayonet-like fca/ below or near the middle, which overtops t)ic crowded 

 panicle ; heads numerous, 5 - 10-Jlowered ; sepals lanceolate, sharp-pointed, us long as 

 the ovate taper-pointed pod. — Sandy bogs, Tewksbuiy and Plymoutli, Massaclm- 

 setta, pine barrens of New Jersey, and southward. Bootstock thick, creeping. 

 Leaf stout, l°-2° long. Heads 2" -3" wide, brown. 



12. J. nodOSUS, L. ! Stem erect, slender {6'-15' high), 3-5-leavcd; 

 loaves terete, short; heads 1-2, or several and clustered, globose, many- (10-20-) 

 Jlowered ; sepals lanceolate, awl-pointed, jiearly as long as the slender iriangidar taper- 

 pointed pod. (J. Rostkovii, £. Meyer.) — "Var. meoacephalus, Torr. : heads 

 rather numerous and larger, 50 - 60-flowered, crowded in a dense cluster at the 

 summit of the stout and rigid stem (2° high). — Gravelly borders of streams ; 

 common, especially northward; the var. on the sandy shore of Lake Ontario, 

 &c. — Rootstocks slender. — Quite distinct from No. 6 and No. 7, with which it 

 has been confounded. 



13. J. Conr£ldJ, Tuckei-m. Stems slender (6' -10' high), leafy, branch- 

 ing above into a compound diffusely spreading cymose panicle, bearing chiefly 

 solitary scattered flowers in the forks and along one side of the branches ; Itavcs 

 thread-form, the upper slightly knotted ; sepals oblong, acutish, shorter than the ob- 

 long taper-beaked pod. (J. viviparus, Conrad, — so named from a condition in 

 which most of the flowers develop into a tuft of rudimentary or manifest leaves. 

 J. No. 15, Muhl. Gram. ? and therefore J. Muhlenbergii, Sprmg. ?) — Wet sandy 

 places, Canada and Wisconsin 1 N. New England to Virginia, and southward, 

 chiefly near the coast. — Rootstocks slender. 



* * * * Leaves knotless : inflorescence terminal. 

 •*- Heads cymose-panicled : leaves flat and open : stamens 3. 



14. S. marg'inatus, Rostk. Stem leafy, erect, flattened {1°- 3° high); 

 leaves linear, grass-like, nerved; heads globose, 3-8-flowered; sepals oblong, 

 the 3 outer with the bracts slightly awned, the inner obtuse and pointless, as 

 long as the globular pod ; seeds minutely pointed at both ends. (J. aristulatus, 

 Michx.) — Moist sandy places, S. New England to Illinois, and southward. 

 July. — Sepals soft, chestnut-purplish, with a green keel. 



