"742 Oedeb 155.— OTPERACE^. 



high ; Ivs. flat, linear, shorter than the stem ; umbel compound, diffuse ; invoL 

 Meaved ; spikelets lanceolate, acute, somewhat 4-sided, 2 — 3 together ; glumes 

 brown, mucronate ; ach. white. — Wet places, along rivers, etc., N. Eng. I to Ga., 

 "W. to Mo. July. (Fimbristilia, R. & S.) 



2 T. coarctata. Culm filiform, teretish, 8 to 12' high; Ivs. setaceous, withbearded 

 sheaths ; vmibel compound, contracted; invol. Ivs. many, short setaceous, one a 

 little longer than the umbel; spikes 15 to 20, linear-oblong, 3" long; glumes 

 about 12, acute, rust-colored ; stam. 2 ; sty. deeply 3-cleft ; ach. obovate, 3-angled. 

 — ^Dry, sandy soils, S. Car. to Fla. (Isolepis Torr. Scirpus Ell.) 



3 T. capill^ris. Culm csespitous, nearly naked, 3-angled, capillary, 4 — 8' high ; 

 Ivs. subradical, setaceous, shorter than the stem ; spikes ovoid, 2 — 4, in a simple 

 umbel, inner one sessile; glumes oblong, ferruginous, margin pubescent; ach. 

 white. — In sandy fields. Mass, to Fla., W. to Ky. and Ohio. Aug. (Isolepis, R. 

 & S. I. ciliatifolius, Ell., a taller form (7 to 10') with 4 to 6 spikes.) 



4 T. stenophylla. Culms twisted, 2 to 4' high, setaceous, as long as the seta- 

 ceous Its. ; spikes 4 to 6, ovoid, acute, few-flowered, sessile, in a dense head ; 

 invol. Ivs. 3 or 4, dilated at base, ciliate, 2 or 3 times longer (3 to 12") than the 

 head ; glumes ovate-acuminate, keeled, greenish ; sty. 3-cleft ; ach. short-triangu- 

 lar, blaok-pruinous when mature. — Dry soils. Car. to Pla. Jl. — Sept. (Isolepis, 

 Kunth. Scirpus, EU.) 



5 T. Warei. Culm filiform, terete, furrowed, near If high ; Ivs. 2 to 3' long, 

 channeled ; spikes 6 to 12, ovoid, in a dense head; invol. Ivs. 3 or 4, longer than 



.the head, base dilated and cut-fringed; glumes ovate, obtuse, ciliate; ach. white, 

 rugulous, obovate-triangular.^W. Ha. (Ware, Torr. Cyp.). Very near the preced- 

 ing. (Isolepis, Torr.) 



6 T. carinata. Culm flattened, setaceous, 3 to 6' high, with a short, solitary 

 setaceous leaf near the base ; spike single, ovoid, lateral near the top of the culm ; 

 glumes green, 6 to 8, broad-ovate, veined acuminate ; sty. 3-cleft ; ach. short- 

 triangular, grayish, half as long as the glume. — Near N. Orleans (Hale) (Isolopi^ 

 Hook. & Am.). 



12. PSILOCAR'YA, Torr. (Gr. ipiXog, naked, Kapva, nut ; no 

 bristles.) Flowers $ . Glumes co, imbricated all round, all fertile ; 

 perigynium ; stam. 2 ; filaments long, persistent ; style 2-oleft, dilated 

 or tuberculate at base ; aohenium biconvex, crowned with the persis- 

 tent style. — Stems leafy. Spikes lateral and terminal, cymous. 



1 F. Bcirpoides Torr. Cukn slender, leafy, smooth, 3-sided, 5 — 9' high; Iva. 

 linear, smooth, 3 — 5' by 1", cauline about 2 ; cymes terminal, and one from the 

 sheath of each cauline leaf; spikes about 3" long, oblong-ovate, in smaU, loose 

 dusters, 20 — SO-flowered; g/ume* chestnut-colored, thin ovate, acute; ach. tumid, 

 dark brown, crowned with the long style, which is much dilated at base. — Bor- 

 ders of ponds, Smithfield, R. I. (Olney), Mass. (Greene), and Ark. (Hale). 



2 P.rhynchosporoideB Torr. Culm 8 to 14' high, leafy, smooth; Ivs. linear, 2" 

 broad, overtopping the culm; umbel few-rayed ; spikes ovoid, 2 to 3" long, all pe- 

 dunculate, 8 to lO-flowered ; glumes roundish ovate, obtuse, pale brown; ach. 

 roundish, lenticular, strongly rugous; tubercle short, obtuse,. — Quincy, Fla. 

 (Chapman). 



13. DICHROM'ENA, Eichard. (Gr. dig, two, XP^fJ.a, color.) Spikes 

 flattened, collected into a terminal head ; glumes imbricate on all sides, 

 many abortive ; perigynium none ; stamens 3 ; styles 8-cleft ; achenium 

 lens-shaped, crowned with the broad, tuberculate base of the style. — 

 Ehizome creeping. Culms leafy. Lvs. of the invol. usually whitened 

 at the base. 



1 D. leucoc^phala Mx. Culm triangular, 2 to 3f high ; lvs. concave, nan'ow, 

 shorter than the culm; invol. 6 to 8-leaved, the lvs. lanceolate, long-pointed, 

 whitened below, spreading, 1 to 4' long ; ach. truncate at the summit, transversely 

 ruguloiis. — Bogs, Md. to Fla. and La. Known at a distance by its white in- 

 volucre. 



