554 ORDER CXLT. CYPERACE^E. 



terior segments cohering-. Fertile florets in the circumference , 

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



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

 — 12 inches long. Scape terete, 10-furrowed, glabrous, sheathed near 

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

 those of the disk longer than the flowers. Perianth somewhat fim- 

 briate. — White. 2f. July — Aug. Wet soils. 2— 3 feet. 



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

 10 inches long. Scape 10-furrowed, sheathed at the base. Flowers in 

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

 when young. — White. 2£. May — Aug. Damp soils. 10 — 15 inches. 



3. 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 Michauxii, Rich. 



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

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

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

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

 soils. Mid. Car. and Geo. 3 — 4 in. Pachalanthus Jlavidulus, Rich. 



GLUMA'CEiE. 



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

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

 ticillate, as in all preceding flowers. 



Order CXLL— CYPERA'CE^E. (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 setae, which are probably a rudimentary peri- 

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

 the leaves entire. 



