OF NORTH AMEUICA. 33 



anonymous in Coll. herb, covered by a scurf, 

 well branched, leaves short, flowers nol so small 

 nor so white, ajDparently ochroleucous in the 

 specimen, umbels glomerate with many male 

 flowers and very few fertile. The seeds not 

 being ripe, I cannot be positive on the Genus, 

 but the habit is quite near the last, the unripe 

 seeds are ovate oblong smooth flat. 



811. PACHILOMA Raf. (thick edge) Po- 

 lytenia Dec. add to characters. Polygamous, 

 invol. none, partial few. Fruit elliptic or obo- 

 vate with a thick margin, middle concave stri- 

 ate. Type P. NUTALi Raf. PoL do Dec. Tor- 

 dyliiim Amerlcanun? Nut. in Col. herb, stem 

 dichotome grooved roughened, leaves alt. and 

 opposite triparted, sei:;ments pinnatifid cuneate, 

 last trifid ; involucels 3-5 linear, seeds elliptic. 

 — Such are my specimens from Nuttal himself, 

 and Arkanzas. 



812. Pachiloma verticillata R. Phaio- 

 sperma or Polytenia do Raf herb.p. 7*7. Stem 

 fistulose grooved, branches whorled rigid, leaves 

 alterne and whorled bipinnatifid, pinnules cun- 

 eate sublaciniate ; involucels 1-3 linear, fruits 

 obovate — found in 1823 in Glades of West 

 Kentucky, vernal, sesquipedal, a very distinct 

 and singular sp. by tiie w horled habit, fruit sim- 

 ilar to the last by the edges (fee, but not regu- 

 larly elliptic broader above and thus obovate, 

 hardly striate in the central hollow. 



I have yet several doubtful and rare ombelli- 

 ferous plants from Florida, Alabama, Kentuky, 

 Illinois and Arkanzas, which require further 

 examination. My N. G. Orlmaria was des- 

 cribed in Adantic Journal, in my Herb. Raf. 

 p. 78 are 3 new Cherophylum and 2 new Arche- 

 mora. My G. Ptiiimnium of 1818 has since 



