MEMOIRS FROM THE DEPARTMENT OF BOTANY OP COLUMBIA UNIVERSITY 97 



Dr. Lehmann held that Jacquin's figure represented the typical Linnaean species. Tor. 

 rey and Gray, in Fl. N. Am., regarded P. il//,wowrica as a synonym of the typical P. 

 Penimjlvanka. I ha^'e therefore accepted that name for this very variable species. 



P. Pennsijlvauica is generally erect, 4-8 dm. high and more or less wooUy-tomen- 

 tose. The leaves are truly pinnate, Avith 3-7 pairs of leaflets, which in the typical form 

 are grayish tomentose beneath and nearly glabrous above, the broad oblong divisions 

 with scarcely revolute margins. 



The typical P. Pennsijlvainca is a comparatively rare plant, ranging in British 

 America from Hudson Bay to the Rockies, and in these extends southward to Colorado. 



Potentilla Pennsylvanica strigosa Pursh. 



Potentilla Pennsylvanica sfrigosa Pursh, Fl. Am. Sept. 356. 1814. 



Poir ; Lam. Enc. Meth. Suppl. 4 : 543 ; Don, Gard. Diet. 2 : 557 ; Lehm. Mon. Pot. 

 55; Rev. Pot. 58; Dietr. Syn. PI. 3 : 186; Walp. Rep. 2: 32; Ann. 2 : 479. 



Eat. Man. Ed. 2 : 380 ; Ed. 3 : 408 ; Torr. & Gray, Fl. N. Am. 1 : 438 ; Gray, Am. 

 Journ. Sc. (II.) 33: 411 (Rep. 22); Proc. Acad. Phil. 1863 : 61; Porter, U. S. Geol. Surv. 

 1871 : 481 ; Coulter, ibid., 1872 : 756; Wats. Proc. Am. Acad. 8 : 554 ; Porter & Coul- 

 ter, Syn, Fl. Colo. 36 ; Coulter, Man. Rocky Mts. 84 ; Wats. & Coult. in Gray, Man. Ed. 6 : 

 159 ; Rydb. Cont. U. S. Nat. Herb. 3 : 157 and 496 ; Fl. Neb. 21 : 16 ; Bull. Torr. Bot. 

 Club, 23 : 263 ; Britt. & Brown, 111. Fl. 2 : 214. 



Lehm.; Hook. Fl. Bor. Am. 1 : 188; Macoun, Cat. Can. PL 137 and 517 ; Ledeb. 

 Fl. Alt. 1 : 356. 



Potentilla strigosa Fall.; Pursh, FL' Am. Sept. 356. As synonym. 1814. 



Lessing, Linnaea, 9 : 154; Tratt. Ros. Mon. 4: No. 31. 



Potentilla pedinata Fisch.; Hook. Fl. Bor. Am. 1 : 188. As synonym. 1833. 



PfjtentiUa ruhricaulis Dougi. ex Lehm. Rev. Pot. 58. 1856. Not Lehm. 



Potentilla ahsinthiifolia Dougl. ex Lehm. Rev. Pot. 58. 1856. 



Illustrations : Plate 38,/. 2 ; dissection of flower,/. 3 ; pistil,/ 4; stamen, / 5 ; 

 fruiting hypanthium and calyx, /. 6. 



Stem generally lower; pubescence mixed with long rather spreading villous hairs. 

 Leaflets deeply divided into narrow lobes, which have revolute margins and are grayish 

 tomentose beneath and more or less villous above. 



This is the most common form of P. Pennsylvanica, found in the same range as the 

 species,but also extending over the plains to Kansas and New JMexico. Also in north- 

 ern Asia. 



