V42 Obder 155.— CTPEEACB^. ' 



high ; Its. flat, linear, shorter than the stem ; umbel compoumd, diffuse ; Invol. 

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

 brown, mucronate ; ach. white. — "Wet plaees, along rivers, eta, N. Eng. I to Ga., 

 "W. to Mo. July. (Fimbristilis, E. & S.) , 



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

 sheaths ; umbel 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 S-oleft; ach. obovate, 3-angKd. 

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



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

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

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

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

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



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

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

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

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

 lar, blaok-pniinous when mature. — ^Dry soils, Car. to Ma. Jl. — Sept. (Isolepis, 

 Kunth. Scirpus, . Ell.) 



5 T. Wdrei. 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, ciliaie; 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 n^ar the top of the culm ; 

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

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

 Hook. & Am.). 



12. PSILOCAR'YA, Torr. (Gr. ijiiXog, naked, icapva, nut ; no 



bristles.) Flowers ^ . Glumes Co, imbricated all round, all fertile ; 

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

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

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



1 P. soirpoides Torr. Culm slender, leafy, smooth, 3-sided, 5 — 9' high; Ivs. 

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

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

 dusters, 20 — 30-flowered ; jfcmes chestnut-colored, thin ovate, acute; ach. tumid, 

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

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



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

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

 dunculate, 8 to 10-flowered; glumes roundish ovate, oMzise, pale brown; aoh. 

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

 (Chapman). 



13. DICHROM'EM, Eichard. (Gr. 6ig, two, XP^^fi"; color.) Spikes 

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

 many abortive ; perigynium none ; .stamens 3 ; styles 2-cIeft ; achenium 

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

 Rhizome 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, narrow, 

 s)u>rter than the culm; invol. 6 to 8-leaved, the hs. lanceolate, long-pointed, 

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

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

 volucre. 



