263 
POTENTILLA PENNSYLVANICA L. Mant. 1: 76. 1767. 
P. Missourica Schrad. Linnaea, 8: Litb. 26. 1833. 
There is some doubt whether this or the next is the true P. 
ennsylvanica L. The description of the leaves seems to indicate 
rather the next species. The form represented by P. Missourica 
has been cultivated in Europe under the name of P. Pennsylvanica. 
The same form was also figured by Jacquin, in his Hort. Vind. 2: 
/!. 789, under that name. Dr. Lehmann held that Jacquin’s figure 
represented the typical Linnaean species. Torrey and Gray, in Fl. 
N. Am., regarded P. Missourica as a synonym of the typical 
P. Pennsylvanica. 1 have therefore accepted that name for this 
very variable species. 
P. Pennsylvanica is generally erect, 4-8 dm. high and more or 
less woolly tomentose. The leaves are truly pinnate, with 3-7 
pairs of leaflets, which in the typical form are grayish tomentose 
beneath and nearly glabrous above, with broad oblong divisions 
and scarcely revolute margins. 
The typical P. Pennsylvanica is a comparatively rare plant, 
ranging in British America from Hudson Bay to the Rockies, 
and in these extends southward to Colorado. 
POTENTILLA PENNSYLVANICA BIPINNATIFIDA (Dougl.) Torr. & Fi. N. 
Am. 1: 438. 1838. 
Potentilla bipinnatifida Dougl. Hook. Fl. Bor. Am. 1: 188. 
1830. 
Segments linear, but their margins scarcely revolute; leaves 
White-tomentose beneath, more or less silky above. 
It is more common than the species and of nearly the same _ 
Tange, but extends into Upper Michigan and Minnesota. 
PoTENTILLA PENNSYLVANICA STRIGOSA Pursh, Fl. Am. Sept. oe 
1814. : 
Stem with spreading hairs; segments narrow and with more 
or less revolute margins. 
This is the most common form of P. Pennsylvanica found in : 
the same range as the species, but also extending over the Leones ee 
to Soni: and New Mexico. Also i in dain Asia. 
