74 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Specimens examined : 
Arizona: E. Palmer, No. 145, 1877. 
Wyoming: ©. E. Sheldon, No. 72, 1884; Fremont, 2d Exp. 
ees Robert Adams, 1871; Rydberg and Bessey, No. 4379, 1897. 
Utah: . F. Ward, No. 119, 1875; M. E. Jones, No. 5554d and 30044, 1894; No. 
1765, 1880; ie Thompson, No. 195, 1873. 
54. Potentilla flabelliformis Lehi. 
Potentilla flabelliformis Lehm. Stirp: Pug2) 12:5 91830) 
Don, Gard. Dict. 2: 554: Walp. Ann. 2: 493; Lehm. Mon. Pot. Suppl. 13; Rey. 
Pot. 108. 
Eat. Man. Ed. 7: 457; Hat. & Wr. N. Am. Bot. 373; Rydb. Bull. Torr. Bot. Club, 
ZAs 6; 
Lehm. in Hook. Fl. Bor. Am. 1: 192; Hook. Journ. Bot. 6: 220. 
Potentilla gracilis flabelliformis Nutt.; Torr. & Gray, Fl. N. Am. 1: 440. 1840. 
Dietr. Syn. Pl. 3: 182; Walp. Rep. 2: 33. 
Cooper, Pac. R. R. Rep. 12: Book 2, Part 2, ba Torr. Bot. U.S. Expl. Exp. 289; Wats. 
King’s Rep. 5: 88; Porter, U.S. Geol. Surv.1871: 482: Coulter , ibid. 1872: 765; Proc. 
Am. Sead: 8: 557- Bot. Cal. 1- 179; Coulter, es Rocky Mts. 85; Tweedy, Fl. Yell. 
Nat. Park, 85; Aven Nelson, Wy. Exp. Sta. Bull. 28: 103; Macoun, Cat. Can. Pl. 138. 
Potentilla flabelliformis tenwior Lehm. Rey. Pot. 108. 1856. 
InLusrrations: Lehm. Mon. Pot. Suppl. pl. 6; Hook. Fl. Bor. Am. 1: pl. 66. 
PLATE 28, f. 1; dissection of flower, f. 2; s amen, f. 3; pistil, f. 4; fruiting hypanthium 
and calyx, f. 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 harrowly linear lobes, which are gene1 ‘ally stiff 
and with revolute margins. Cyme open but branches rather short and strict. Hypan- 
thium silky-villous, in fruit about 8mm. 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 into linear segments. They are also white-tomentose beneath and densely 
silky above. There are two forms: the one with narrow linear more or less revolute 
lobes and smaller flowers resembles Lehmann’s figure in Hooker’s Fl. Bor. Am., and is 
