850 North Amtncan Cijperacea. 
deeply 3-clett. Nut nearly half the length of the scale, brownish, 
roughened with small papillss, very acutely triangular, the sides con- 
cave, the summit without any remains of the style. 
Hab. Near New Orleans, T. Dnnnmond ! ; on the Arkan- 
sas river, Nuttall ! 
Obs. a well-characterized species which I received (with- 
out a name) from Mr. NiittaU, in 1S20, who collected it during 
his journey in Arkansas Territory. 
§ 2. S/nkes terminal, umhelled. 
3. IsoLEPis Drummoa^dii, Torr. ^ Hook. 
Culm compressed and somewhat G-sided, deeply sulcate ; 
leaves very narrow, channelled ; umbel compotmd ; rays 4 — 6 
longer than the involucre ; spikes oblong-ovate, acute ; scales 
coriaceous, broadly ovate, smooth, with a short abrupt acumi- 
nate point, somewhat carinate towards the summit ; style two- 
parted, smooth ; nut lenticular, acute. 
Culm 3 feet high, slender but firm, very smooth, one side deeply chan- 
nelled. Leaves half as long as the culm, scarcely a line wide, convex on 
the under surface, smooth. Umbel erect, rays 1 — 2 inches long. Invo- 
lucre of 2 — 3 narrow-channelled leaves, all of which are shorter than the 
rays. .SpzArcs half an inch long. ^cf/Zes closely appressed, smooth, of a 
light brown colour. Stamens 3 ; filaments very broad, obtuse. Stijlc 
deeply 2-parted, persistent. Nut much compressed, somewhat mar- 
gined, dotted. 
Hab. Texas, 2\ Drummond ! 
Obs. a very distinct species, with the habit oi FimhristyUs 
spadicea. It is, however, a genuine Isolepis, as the style is 
formed by the gradual attenuation of the nut, without any ap- 
pearance of tubercle or articulation. 
4. Isolepis capillaris. Ram. Sf Schdt. 
Culm angular and sulcate, capillary, nearly naked ; leaves 
setaceous, serrulate-ciliate, much shorter than the culm ; spikes 
