( rPERACKfi. (sedge family.) 52 1 



acute-angled nut. — ZV r 1 1 < 1 ■ 1 \- hanks of the Chipola River, ami of Flat Creek, near 

 Aspalaga, Florida, to South Carolina; not common. Aug. — Culm 2°-4° 

 high, often proliferous at the joints. Umbel 6'- 12' long. Spikes 2"-3" lung. 



# # /, fa < t,. capillary, smooth, crisped and entangled. (Trichophorum.) 



10. S. El'iophoi'Urn, Mi'hx. Culm nearly terete, with the joints remote; 

 leaves linear, elongated, keeled; umbel terminal, decompound, spreading or 

 recurved, shorter than the 3-5-leaved involucre; spikes single or clustered, 

 ovate; scales thin, lanceolate, obtuse; bristles many times longer than the 

 oblong compressed-3-angled beak-pointed nut, at length exserted, and covering 

 the >]>ikc with woolly down. (Triehoj)horum cypcrinum, Pers.) — Swamps and 

 low grounds, Florida, and northward. July- Sept. — Culm 2° -4° high. 



11. S. lineatus, Michx. Culm 3-angled; leaves flat, linear-lanecolatc ; 

 umbels lateral and terminal, longer than the 1 -3-leaved involucre ; spikes all 

 single, cylindrical ; scales rigid, keeled, mucronate; hristles harely exserted; nut 

 as in the preceding. Swamps, Georgia, and northward. June -Aug. — Culm 

 2° - 3° high. Spikelets 3" -4" long. . 



9. ERIOPHORUM, L. Cottox-Grass. 



Spikes many-flowered. Scales imbricated in many rows. Perianth composed 

 of numerous (rarely 6) smooth and flat hairs, much longer than the scale, and 

 forming a woolly or silky tuft. Stamens commonly 3. Style 3-cleft, deciduous. 

 Nut 3-angled or lenticular. — Perennials, with leafy culms, in our species, and 

 clustered or umbelled spikes. 



1. E. Virginicum, L. Culm nearly terete, rigid ; leaves narrowly linear, 

 elongated ; spikes densely clustered, nearly sessile, erect; involucre 2 -3-leaved; 

 wool reddish, thrice the length of the brownish scales; nut comprcssed-3-angled, 

 acute. — Bogs and swamps, Florida, and northward. June -Aug. — Culm 2°- 

 3° high. Leaves 10'- 18' long. 



2. E. polystachyon, L. Culm terete ; leaves broadly linear, 3-angled 

 at the summit ; spikes umbelled, distinct, on slender at length nodding peduncles ; 

 involucre 2-leaved, shorter than the umbel; wool white, many times longer than 

 the dark brown scales ; nut obtuse. — Meadows and bogs in the upper districts, 

 Georgia, and northward. Aug. and Sept. — Culm 1° - 2° high. Leaves 3' - 6' 

 long. 



10. FIMBRISTYLIS, Vabl 



Spikes many-flowered. Scales imbricated in several rows. Perianth none. 

 Stamens 1-3. Style 2-cleft, commonly flat and fringed on the margins, tumid 

 at the base, deciduous. Nut lenticular. — Culms jointless, leafy at the base. 

 Involucre 1 - several-leaved. Spikes terminal, umbellate or clustered. 



* Spikes umbelled. 

 1. F. spadicea, Vahl. Perennial; culms clustered, nearly terete, rigid 

 (2° -3° high); leaves long, linear or filiform, concave, rough on the margins; 

 umbel simple or compound, erect ; involucre 2 - 3-lcaved ; spikes ovate or ob- 

 U* 



