554 OKDEK CXLI. CYPEKACEJ^. 



terior segments cohering. Fertile florets in the circumference , 

 perianth 4-partecl. Style 1. Stigmas 2 or 3. 



1. E. decangula're, (L.) Leaves ligulate, very narrow, glabrous, 10 

 — 12 inches long. Scape terete, lO-furrowed, glabrous, sheathed near 

 the base, bearing a large spherical head. Scales of the involucre oviite ; 

 those of the disk longer than the flowers. Ferianth somewhat fini- 

 briate.— White, n. July— Aug. Wet soils. 2— 3 feet. 



2. E. gxaphaloi'des, (Mich.) Leaves subulate, ensiform, glabrous, 8 — 

 10 inches long. Scape lOfurrowed, sheathed at the base. Floicers in 

 a compact head. Scales of the involucre oval, silvery white, villous 

 when young. — V/hite. 2|. May — Aug. Damp soils. 10 — 15 inches. 



8. E. viLLo'suM, (Mich.) Leaves subulate, hairy, 2 — 3 inches long. 

 Scapes villous, slender, clustered. Flowers in small, globose heads. 

 Scales of the involucre colored, ovate. Perianth very dark-colored, 

 with the summit white. — If. May — Sept. Damp soils. 10 — 12 in. 



Lachnocaulon Michaiixn, Rich. 



4, E. flavid'ulum, (Mich.) Leaven subulate, nerved, 1 — 2 inches 

 long, slightly hairy. Scape 7-furrowed, pubescent or glabrous. Floioers 

 in convex heads. Scales of the involucre nearly round; tliose of the 

 disk linear-lanceolate. Capsule didymous. — 11. June — July. Wet 

 soils. Mid. Car. and Geo. 3 — 4 in. Pachalanthusjlavidulii>i, Ricii. 



GLUMA'CE^. 



Flowers destitute of a true perianth, the floral envelopes con- 

 sisting of imbricated bracts, Avhich are alternate, instead of ver- 

 ticillate, as in all preceding flowers. 



Order CXLL— CYPERA'CE^. {Sedge Family) 



Flowers perfect or monoecious, consisting of imbricated, soli- 

 tary bracts. Perianth none, unless the glumes, when present, 

 be so considered. Stamens hypogynous, definite, 1 — 12. An- 

 thers fixed by their base. Ovary 1 -seeded, often surrounded 

 by hypogynous setse, which are probably a rudimentary peri- 

 anth. Style 1, divided. Stems usually angular. Sheaths of 

 the leaves entire. 



