494 BOTANT. 



§ 3. AETICULATI. Stem leafy ; leaves knotted hj internal cross-partitions. 



* Leaves terete or sliglitly compressed. 



(a.) Seeds 'barely pointed. 



(1.) Heads 2-1-flowered ; stamens 6. 



37. J. PELOCAEPUS, E. Mey. 6-18' high ; leaves threadlike ; panicle compound, spreading ; flowers 

 small, secund ; sepals obtuse.— Newfoundland to Wisconsin and south on the coast to Florida. Tar. (?) 

 SUBTILIS, Eng. Creeping or floating, mostly with a single 2-flowered head; stamens 3. — Canada. 



(2.) Heads few-flowered. 

 (2".) Stamens 6. 



38. J. AETICTJLATUS, L. 9-15' high ; panicle short, dense, spreading, brown ; sepals mostly acute ; 

 capsule deep-brown, ovate-oblong, acute.— N. Europe ; Newfoundland ; N. England to New York and 

 Delaware. 



39. J. ALPtsiDS, Vill. Europe; Asia. Var. iNSiGNis, Fr. 9-18' high; panicle erect, elongated, 

 greenish or light-brown ; sepals obtuse ; capsules light-brown, obtuse, mucronate. — From Lake Cham 

 plain to N. Illinois, Colorado and Washington Territory and north to the Arctic Ocean. 



40. J. DUBius, Eng. Eootstook thick, horizontal ; stems 1^3° high, erect, terete-compressed, as also 

 the leaves ; panicle 3-5' long, decompound, spreading ; heads 6-10-flowered, straw-color ; flowers subses- 

 sile ; sepals nearly 2" long, lance- subulate, very acute, equal ; stamens half as long, the anthers rather 

 exceeding the filament ; capsule linear-prismatic, acute, 1-celled, exserted ; seeds obovate, J" long, pointed 

 at both ends, 5-7-ribbed and reticulate. — Resembling J. oxymeris. Big Tree Grove, California. 



41. J. MiLiTARis, Big. 2-4° high; leaf single, stout, erect; panicle ' about 3' long; heads mostly 

 5-12-flowered ; sepals lanceolate, outer awl-pointed, equaling the ovate beaked 1-celled capsule. — ^Maine to 

 Maryland. 



(2''.) Stamens 3. 



42. J. SUPINIFOKMIS, Eng. stem 1° high or more, shorter than the erect terete leaves ; early leaves 

 capillary, floating ; panicle simple ; heads about 5-flowered ; sepals 2" long, ovate-lanceolate, cuspidate, 

 equal, or the outer a little shorter ; anthers much shorter than the filament ; style very short ; capsule 

 prismatic, obtuse, mucronate, 1-celled, scarcely exserted ; seeds obovate, pointed at both ends. — Mendo- 

 cino City, California. 



43. J. Elliottii, Chap. Stems slender, 1-2° high, much exceeding the leaves ; panicle 3-4' long, 

 subspreading ; heads 3-9-flowered, globose ; sepals 1" long, ovate-lanceolate, very acute, equal and nearly 

 equaling the dark-brown and shining broadly ovate obtuse very shortly mucronate 1-celled capsule ; 

 anthers scarcely exceeding the filament ; stigmas subsesslle ; seeds oblauceolate, attenuate each way, 

 dark-brown, reticulated. — N. Carolina to Florida and S. Mississippi. 



44. J. ACUMINATUS, Mx. Panicle eflFuse ; heads few-many-flowered, pale or at length darker ; sepals 

 lanceolate-subulate, very acute, equal, equaling or shorter than the prismatic short-pointed capsule. — 

 Very variable. From New England to Missouri and the Eio Grande. 



(3.) Heads many-flowered. 



(3".) Stamens 3. 



45. J. BRACHYOAEPus, Eng. l-2i° high, with 2-10 dense globose heads in a short panicle ; sepals 2" 

 long, lanceolate-subulate, the inner much shorter than the outer, but exceeding the ovoid pointed pod. — 

 Ohio to Missouri and south to Louisiana and Texas. 



46. J. SCIEPOIDES, Lam. 1-4° high, with few-many dense pale-green globose heads ; sepals rigid, 

 subulate and bristle-pointed, nearly equaling the pyramidal subulate 1-cellod capsule. — Variable. New 

 Jersey to Florida and west to Arkansas and Texas. 



47. J. BoLANDBRi, Eng. Stems 2° high or more, slender, compressed ; sheaths of the terete leaves 

 long-auricled ; heads 30-50-flowered, solitary or few in a cluster, or shortly peduncled ; flowers brown, 

 sessile i sepals linear-lanceolate, subulate, 2" long, equal, equaling the clavate-tnrbinate obtuse mucro- 

 nate capsule ; filaments 2-3 times longer than the pointed authors ; seeds obovate, reticulate, J" long. 



Near Mendocino City, California. 



(St.) Stamens 6. 



48. J. NODOSUS, L. 6-15' high ; stolons tuberiferous ; heads 8-20-flowered, brown ; sepals lauce- 

 linear, acute, shorter than the slender beaked 1-celled capsule ; seeds reticulated.— The typical form from 

 Hudson's Bay to Pennsylvania and Wisconsin and west to the Pacific. Var. megacepiialtjs Torr. ■ see 

 page 358. Var. Texanus, Eng. ; taller, panicle compound, flowers larger (2i") and more numerous, an- 

 thers obtuse, often twice as long as the filaments ; only in Texas. 



