850 Nor III Aincrkan Ci/2>eracccB. 



deeply 3-cleft. Nut nearly half the length of the scale, brownish, 

 roughened with small papilte, very acutely triangular, the sides con- 

 cave, the summit without any remains of the style. 



Hab. Near New Oiieans, T, Drummond ! ; on the Arkan- 

 sas river, Nuitall! 



Obs. a well-characterized species which I received (with- 

 out a name) from Mr. Niittall, in 1820, who collected it daring 

 his journey in Arkansas Territory, 



§ 2. SpiJccs terminal, umhellcd. 

 3. IsoLEPis DRUMMOXDti, Torr. Sf Hook. 



Culm compressed and somewhat 3-sided, deeply sulcate ; 

 leaves very narrow, channelled ; umbel compound ; -rays 4 — G 

 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. Spikes half an inch long. Scales closely appressed, smooth, of a 

 light brown colour. Stamens 3; filaments very broad, obtuse. Style 

 deeply 2-parted, persistent. Nut much compressed, somewhat mar- 

 gined, dotted. 



Hab. Texas, 2\ Drummond ! 



Obs. A very distinct species, with the habit oiFimbristylis 

 spadicca. 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. IsoLEns CAPiLLARis, Rccm. ^' Schult. 



Culm angular and sulcate, capillary, nearly naked ; leaves 

 setaceous, serrulate-ciliate, much shorter than the culm ; spikes 



