OF NORTH AMERICA. 
is 
anonymous in Coll. herb, covered by a scurf, 
well branched, leaves short, flowers not so small 
nor so white, apparently 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. nut a li Raf. PoL do Dec. Tor - 
dylium Americanum Nut. in Col. herb, stem 
dichotome grooved roughened, leaves alt. and 
opposite triparted, segments 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, 77. 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 the whorled habit, fruit sim- 
ilar to the last by the edges &c, 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. Orimaria was des- 
cribed in Atlantic Journal, in my Herb. Raf. 
p. 78 are 3 new Ckerophylum and 2 new Arche - 
mora . Mv G. Ptilimnium of 1818 has since 
5 
