344 North Aniencan Cyperaceegy 



Species of Isolepis, VaJd. 

 Species of Scirpus, Linn., Willd, 



1. FlMBKISTYLIS BaLDWINIANA. 



Culm silicate and somewhat compressed ; leaves mostly ra- 

 dical, channelled, serrulate, nearly as long as the culm ; umbel 

 few-spiked, simple or somewhat compound, shorter than the" 

 involucre ; spikes ovate, acute ; scales broadly ovate, somewhat 

 mucronate ; nut marked with tubercufeted ribs and transverse^ 

 striae ; style somewhat ciliate.- 



Scirpus sulcatus, Elliott! sk. 1. p. 86, (not of A. de P. Thouars);-" 

 Sprcng. syst. 1. p. 212. 



S. Baldwinianus, Scliult. mant.2. p. 85; DarlingtJfl. Cest. ed. 2. p^ 

 18. 



S. ferrugineus, Darlingt. .' fl. Cest. ed. 2. p. 7. 



Culms cespitose, deeply sulcate, 2 — 12 inches high, smooth. Leaves 

 narrow, channelled on the upper surface, sometimes overtopping the 

 culm, slightly ciliated with very minute teeth or serratures, sometimes 

 hair}^. 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-fourths of an inch longy 

 sometimes divided. SpiJces 3 lines long, acute or somewhat acuminated.- 

 Scales membranaceous, wiih a short abrupt mucronate point; the sides 

 yellowish brown ; keel green. Stamen solitary. Style dilated at the 

 base into a roundish bulb, the whole at length separating from the nut ; 

 the divisions spreading and recurved. Nut obovate, Avhitish, marked on 

 each sides with 6 — 8 prominent ridges, sometimes with a number of 

 warts towards the summit. 



Hab. Damp clayey soils, Pennsylvania to the Gulf o^ 

 Mexico, and west to the Mississippi. West Chester, Penn- 

 sylvania, Dr. DarUngt07i! ; near Charleston, South Carolina,. 

 Elliott!; Riceborough, Georgia, L. Le Conte, Esq.! ; St,. 

 Louis and New Orleans, T. Driimmond! 



Obs. Allied to F. laxa, Vahl, and also to F. miima, R^ 

 ^ S. My St. Louis and New Orleans specimens have the 



