74 MEMOIRS FEOM THE DEPARTMENT OF BOTAKY OF COLUMBIA UNIVERSITY 



Specimens examined : 

 Arizoaa : E. Palmer, No. 145, 1877. 



Wyomiag : C. E. Sheldon, No. 72, 1884; Fremont, 2d Exp. 

 Montana: Robert Adams, 1871 ; Rydberg and Bessey, No. 4379, 1897. 

 Utah: L. F. AVard, No. 119, 1875; M. E. Jones, No. 5554d and 35544, 1894; No. 

 1765, 1880; Mrs. Thompson, No. 195, 1873. 



54. Potentilla flabelliformis Lehm. 



Potentilla flaheUifurinis Lehm. Stirp. Pug. 2 : 12. 1830. 



Don, Gard. Diet. 2: 554; Walp. Ann. 2: 493; Lehm. Mon. Pot. Suppl. 13; Rev. 



Pot. 108. 



Eat. Man. Ed. 7: 457; Eat. & Wr. N. Am. Bot. 373; Rydb. Bull. Torr. Bot. Club, 



24: 6. 



Lehm. in Hook. Fl. Bor. Am. 1 : 192 ; Hook. Journ. Bot. 6 : 220. 



Potentilla gracilis flabdUfonnis Nutt.; Torr. & Gray, FL N. Am. 1 : 440. 1840. 



Dietr. Syn. PI. 3 : 182 ; Walp. Rep. 2 : 33. 



Cooper, Pac. R. R. Rep. 1 2 : Book 2, Part 2, 55 ; Torr. Bot. U. S. Expl. Exp. 289 ; Wats. 

 King's Rep. 5: 88; Porter, U. S. Geol. Surv.1871 : 482; Coulter, ibid. 1872: 7G5; Proc. 

 Am. Acad. 8: 557 ; Bot. Cal. 1: 179; Coulter, Man. Rocky :\lts. 85; Tweedy, Fl. Yell. 

 Nat. Park, 35; Aven Nelson, Wy. Exp. Sta. Bull. 28: 103; Macoun, Cat. Can. PI. 138. 



Potentilla fiahcUlfonals tcnuior Lehm. Rev. Pot. 108. 1856. 



Illustrations: Lehm. Mon. Pot. Suppl. pi. 6; Hook. Fl. Bor. Am. 1: pi. 66. 

 Plate 28, f. 1; dissection of flower,/. 2; stamen,/. 3; pistil,/ 4; fruiting hypanthium 

 and calyx, / 5. 



Stem slender but strict, 4-6 dm. high, silky, branched above. Stipules lanceolate 

 or linear. Leaves of about 7 digitate leaflets, densely silky above, white-tomentose be- 

 neath ; leaflets pectinately divided into narrowly linear lobes, which are generally stiff 

 and with revolute margins. Cyme open but branches rather short and strict. Hypan- 

 thium silky-villous, in fruit about 8 mm. in diameter; bracts linear-lanceolate, much 

 shorter than the triangular-lanceolate acuminate sepals. Corolla 10-15 mm. in diam- 

 eter ; petals obcordate, a little longer than the sepals. 



P. flabelliformis differs from the related species in the leaves, which are divided to 

 near the base int.:. linear segments. They are also Avhite-tomentose beneath and densely 

 silky aboA-e. There are two forms ; the one Avith narrow linear more or less revolute 

 lobes and smaller flowers resembles Lehmann's figure in Hooker's Fl. Bor. Am., and is 



