Genus i. 



RUSH FAMILY. 



473 



19. Juncus setaceus Rostk. Awl-leaved Rush. Fig. 11 84. 



Juncus setaceus Rostk. Monog. June. 13. pi. 1. f. 2. 1801. 

 Densely tufted from stout branching rootstsocks. 

 Stems terete, spreading and recurved above, ii°-3° 

 long; leaves all basal except those of the inflorescence, 

 the uppermost sheath usually bearing a long terete 

 blade similar to the stem, but channeled; the other 

 sheaths with filiform blades less than ¥ in length; 

 involucral leaf appearing like a continuation of the 

 stem, 4'-i° long; inflorescence appearing lateral, 2' 

 long or less; perianth i"-2$" long, its parts lanceolate, 

 acuminate, rigid, widely divergent in fruit; stamens 6; 

 anthers usually longer than the filaments; capsule 

 globose, shining, mucronate, i-celled, with intruded 

 placentae, barely dehiscent; seed subglobose, i"-l" 

 long, reticulate in about 12 longitudinal rows, the 

 areolae large. 



In marshes, Delaware to Florida and Texas, near the 

 coast, extending north in the Mississippi Valley to Mis- 

 souri. 



20. Juncus marginatus Rostk. Grass-leaved Rush. Fig. 1185. 



n I Juncus marginatus Rostk. Monog. June. 38. pi. 2. f. 3. 1801. 



Juncus marginatus var. paucicapitatus Engelm. Trans. St. 

 Louis Acad. 2: 455. 1866. 



Stems erect, tufted, 6'-3o' high from branching root- 

 stocks, somewhat bulbous at the base, compressed, 

 2-4-leaved. Leaf-sheaths auriculate; blades i"-ii" 

 broad, 2-4 conspicuous veins in addition to the midrib ; 

 inflorescence 4' high or less, the panicle composed of 

 2-20 turbinate to subspherical 5-10-flowered heads; 

 perianth ii"-il" long, the outer parts ovate, acute, the 

 inner slightly longer, obovate, obtuse, with hyaline 

 margins ; stamens 3, nearly as long as the perianth ; 

 anthers ovate, reddish brown when dry, much shorter 

 than the filaments ; capsule equalling the perianth, obo- 

 void, truncate or retuse, almost 3-celled, the placentae 

 deeply intruded; seed oblong, \"-\" long, pointed at 

 either end, 12-16-ribbed. 



Grassy places, Maine to Ontario, Florida and Nebraska. 



21. Juncus aristulatus Michx. Large 

 Grass-leaved Rush. Fig. 1186. 



/. aristulatus Michx. Fl. Bor. Am. i: 192. 1803. 

 /. marginatus bifiorus Wood, Class-book, Ed. 2, 725. 



1861. 

 /. marginatus aristulatus Coville, Proc. Biol. Soc. 



Wash. 8 : 123. 1893. 



Plants solitary or sparingly tufted, io'-3° high 

 or sometimes lower. Stems markedly bulbous- 

 thickened at the base ; leaves similar to those of 

 /. marginatus, but sometimes 2i" broad; panicle 

 6' high or less, composed of numerous, usually 

 20-100, relatively small, 2-5-flowered heads ; peri- 

 anth about 1 J" long; sepals acute or acuminate; 

 petals oblong or obovate, obtuse, longer than the 

 sepals ; stamens as long as the perianth or longer ; 

 anthers much shorter than the filaments; cap- 

 sules obovoid, about 1" long, truncate or de- 

 pressed at the apex. 



In moist soil or meadows, Massachusetts to Mich- 

 igan, Florida, Texas and Mexico. 



