21(i 



JUNCACEAE (RUSH FAMILYJ 



692. J. Torrejn. 

 Inflorescence x %. 

 Fruiting flower x 3, 



J. brachycarpus 

 Inflorescence x %. 

 Fruiting flower x '■, 



31. J. TorrSyi Coville. Similar to tlie last ; stem stouter (0.4-1 m. high) 



with thick leaves ; heads few and large (1-1.5 cm. in diameter), 30-80-flowered ; 



anthers linear, shorter than the filamtints. {J. nodosus, 



"^ var. megacephalus Torr.) — Low sandy soil, Mass. to Sask., 



westw. and southw. July-Oct. Fig. 592. 



32. J. brachycArpus Engelm. Stem erect (4-9 dm. 

 high), from a thick white horizontal rootstock, bearing 

 about 2 leaves and 2-10 densely flowered spherical heads 

 (7-11 mm. in diameter) in a slightly 

 spreading crowded cyme much exceed- 

 ing the involucral leaf ; flowers pale green 

 (4 mm. long) ; anthers much shorter 

 than the filaments ; style very short ; 

 seeds (0.3 mm. long) abruptly apiculate. 

 — Damp light soil, Mass. to N. C. ; Ont. 

 to Miss, and Tex. June-Aug. Fig. 593. 



33. J. scirpoides Lam. Stem erect (2.5-9 dm. high), 

 rather slender, from a thick horizontal rootstock, bearing 

 aboul 2 terete leaves with wide and open sheaths, and a cyme 

 of few or many densely flowered pale green irregularly spheri- 

 cal heads, much longer than the involucral leaf, its branches 

 erect and often elongated ; heads (G-13 mm. in .diameter) 

 1 5-40-flowered ; flowers 3-4 mm. long; sepals and petals rigid, 

 awl-shaped and (especially the sepals) bristly-pointed, at 

 length pungent, as long as the stamens and nearly equaling 

 the oblong-triangular taper-pointed 1-celled capsule ; anthers 

 very small ; style elongated or very short ; seeds ovoid, 

 abruptly pointed at each end (0.6 mm. long.) — Wet sandy soil, N. Y. to Fla., 

 Mo., and Tex. July-Sept. 



34. J. megacephalus M. A. Curtis. Stouter ; leaves terete ; branches of the 

 compact cyme short; heads larger, spherical, 40-80-flowered ; flowers 4 mm. 



long; sepals and petals narrower and more sharply pointed, 

 the sepals a little longer than the petals ; stamens shorter 

 and anthers longer than in the preceding, and seeds rather 

 smaller and more slender, {j. scirpoides, var. echinatus 

 Engelm.) — Va. (?) to Fla. 



i ^35. J. acuminatus Michx. Stems tufted, erect, slender 



(3-7 dm. high), bearing about 2 leaves and a very loose 

 spreading cyme ; heads rather few and large (0.5-1 cm. 

 broad), 5-many-flowered, greenish, at length straw-colored 

 or darker ; sepals and petals lance-awl- 

 shaped, sharp-pointed, equal, as long as 

 the ovoid-prismatic short-pointed 1-celled 

 straw-colored or light brown capsule : an- 

 thers a little shorter than the filaments; 

 style almost none; seeds small (0.3-0.4 

 mm. long), acute at both ends, ribbed and 

 reticulated.- — N. E. to Ga., Minn., and 

 Tex. May-xVug. — Heads often prolifer- 

 ous in autumn. (Mex.) Fig. 594. 



36. J. d^bilis Gray. Stems slender 

 (2-8 dm. long), flaccid, erect, decumbent, 



or even rooting at the nodes ; heads green, 2-7-flowered, in a 



loose cyme (0.5-2.5 dm. long); flowers small (2.5 mm. long); 



capsule oblong-prismatic, short-mucronate. (J. ai-Aiminatus!. var. 



Engelm.) — Wet sandy soil, R. I. to Mo., and snuthw. May- Frultin""^ flower i\ 



Aug.' Fig. 595. 



37. J. diffusissimus Buckley. Slender and erect (2.5-6 dm. high) ; heads very 



numerous, 2-7-flowered, in a very diffuse and loosely dichotonious cyme (1-2.5 



dm. long), the branches suberect ; flowers greenish or pale brown, ;! mm. long, tho 



594. J. acuminatus. 

 Inflorescence x %. 

 Fruiting flower x ;^ 

 Seed X 25. 



595. J. debilis. 

 Inflorescence X %. 



