344 North Ainerlcan CyiJcracecs^ 
Species of Isolepis, Vald. 
Species of Scirpus, Linn., Willd. 
^. FlMBKlSTYLlS BaLDWINIANA. 
Culm sulcata and somewhat compressed ; leaves mostly ra^ 
dical, channelled, serrulate, nearly as long as the culm ; umbel 
few-spiked, simple or somewhat compound, shch-ter than the' 
involucre ; spikes ovate, acute ; scales broadly ovate, somewhat 
mucronate ; nut marked with tuberculated ribs and transverse- 
striae ; style somewhat ciliate, 
Scirpus sulcatus, Elliott.' sk. 1. p. 86, (not of A. de Pr Thouars) ;^^ 
Sjnoig. syst. 1. p. 212. f 
S. Baldwinianus, ScTiult. mant. 2. p. 85; Darlingi. ! fl. Cent. ed. Jt. p* 
18. 
»S. ferrugineus, Uarlingt. .' fl. Cest. ed. 2. p. 7. 
Culms cespitose, deeply sulcate, 2 — 12 inches high, SHiooth. Leaves 
narrow, channelled on di« upper surface, sometimes overtopping the 
calm, slightly ciliated with very minute teeth or serratures, sometimes 
hairy. Involucre about 3-leaved ; one of the leaves longer than the 
umbel, all of them denticulate like those of the culm. Umbel mostly 
simple; rays 2 — 4, seldom more than three-fourtlis of an inch long, 
sometimes divided. Sjiikes 3 lines long, acute or soinewhat acuminatedr. 
Scales membranaceous, with a short abrupt mucronate point; the sides 
yello-wish brown ; keel green. Stamen solitary. .Sii//e dilated at the 
base into a roundish bulb, the whole at length separating from the nut; 
the divisions spreading and recurved. ]\ut obovate, whitish, marked on 
each sides with 6 — 8 ])rominent ridges, sometimes with- a number of 
warts towards the summit. 
Hab. Damp clayey soils, Pennsylvania to the Gulf of 
Mexico, and west to the Mississippi. West Chester, Penn- 
sylvania, Dr. Darlington ! ; near Charleston, South Carolina, 
Elliott!; Riceborough, Georgia, L. Le Conte^ Esq. ! ; Su 
Louis and New Orleans, T. Drummond ! 
Obs. Allied to jP. laxa, Vald, and also to jP. annua, R. 
^ S. My St. Louis and New Orleans specimens have the 
