i350 North A/nw/can CyperaceiB. 



deeply o-cleft. Nut nearly half the length of the scale, browilisli- 

 roughened with small papilla;, very acutely triangular, the sides con* 

 cave, the summit without any remains of the style. 



Hab. Near New Orleans, T. Drummoiid ! ; on the Arkan- 

 sas river, Nuttall! 



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

 out a name) from Mr. Nuttall, in 1820, who collected it during 

 his journey in Arkansas Territory. 



§ 2. Spikes terminal, umbelled. 

 3. IsoLEPis Drummondii, Ton: ^ HooJc. 



Culm compressed and somewhat 3-sided, deeply sulcate ; 

 leaves very narrow, channelled ; umbel compound ; 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 deej)ly 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. S_pikcs half an inch long. Scales closely ap^pressed, 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, T. Drummond ! 



Obs. a very distinct species, with the habit oi Fimhristylis 

 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. IsoLETis CAPiLLARis, Roem. ^ Sclndt. 



Culm angular and sulcate, capillary, nearly naked; leaves 

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



