1412 
POTENTILLA* missourica. 
Missouri Cinquefoil. 
ICOSANDRIA POLYGYNIA. 
Nat. ord. Rosaceæ Jussieu. (Introduction to the natural system of 
Botany, p. 81.) 
POTENTILLA.—Supra, vol. 16. fol. 1379. 
Sect. Foliis pinnatis. 
P. missourica ; caule erecto stricto, foliis pinnatis sub-3-jugis suprà incano- 
sericeis subtús niveo-lanatis, foliolis oblongis pinnatifidis : laciniis lanceo- 
lato-linearibus acutis, stipulis foliaceis incisis, foliis superioribus sub- 
integris, bracteis foliaceis, floribus corymbosis, calycibus lanatis petalis 
emarginatis longioribus. 
P. missourica. ** Hornemann." 
P. arguta. Spreng. sp. pl. 2. 534. non Purshii. 
Herba perennis. Folia pinnata, 2-3-juga, radicalia, pinnatifida : laciniis 
lineari-oblongis acutis subfalcatis, suprà incana, subtüs niveo-lanata. Caulis 
erectus, pedalis, incanus, subdichotomus, foliis ad dichotomias inferiores sub- 
simplicibus : stipulis laciniatis, ad superiores subintegris. Flores in axillis 
dichotomiarum solitarii, et in corymbis terminalibus. Calycis sericeo-lanati 
lacinie ovate, acute, integre. Petala parva, lutea, emarginata, calyce 
minora. 
This is no doubt one of the plants confounded with 
P. arguta of Pursh, from which it is nevertheless extremely 
different. For the knowledge that it is the P. missourica 
of Hornemann, we are indebted to Professor Lehonann, 
who pointed it out to us during his visit to England last 
year. 
It is nearly related to P. pectinata of Fischer, which is 
wrongly referred to P. pennsylvanica, as a synonym, in 
M. De Candolle's Prodromus. From that species it is 
known not only by its hoariness, but also by the nakedness 
* See fol. 1379. 
