MEMOIRS FROM THE DEPARTMENT OP BOTANY OF COLUMBIA UNIVERSITY 113 



Lehm. ; Hook. Fl. Bor. Am. 1 : 188; Macoun, Cat. Can. PI. 137. 



Potentilla dealbata Dougl.; Hook. Fl. Bor. Am. 1: 188. As synonym. 1833. 



Potentilla leneophylla Eat. Man. Ed. 5: 344. 1829. 



Eat. Man. Ed. 6: 281 ; Ed. 7: 458; Eat. & Wr. N. Am. Bot. 373. 



Potentilla Penmijlvanicum Hlpjiiana Torr. & Gray, Fl. N. Am. 1 : 438. 1841. 



Dietr. Syn. PI. 3: 186; Walp. Rep. 2: 32. 



Gray, Proc. Acad. Phil. 1863: Gl ; Torr. Pac. R. R. Rep. 5: No. 4: 84; Porter, 

 U. S. Geol. Surv. 1870 : 475. 



Illustrations : Hook. Fl. Bor. Am. jol. 64; Britt. & Brown, 111. Fl. 2 : /. 1927, 

 Plate 50, f. 1; dissection of flower,/. ^2 ] pistil,/. 3 ; stamen,/. 4; fruiting hypanthium 

 and calyx, /. 5. 



Stem erect, 3-5 dm. high, more or less silky canescent or white with appressed hairs, 

 leafy, dichotomously branched above, the branches generally erect. Stipules 1-2 cm. 

 long, ovate-lanceolate, acuminate, subentire. Basal leaves several, the petioles about 5 cm. 

 long; leaflets 3-5 pairs. Stem leaves generally several, short-petioled, 7-3-foliolate, all 

 white or grayish silky on both sides and tomentose beneath ; leaftets gradually dimin- 

 ishing downward, obovate or cuneate-oblong, 2-5 cm. long, deeply obtusely toothed, 

 venose beneath, sometimes a little decurrent on the rachis, the upper often confluent, 

 margins not revolute. Bractlets lanceolate, generally narrower than the sepals, but often 

 nearly equalling them in length, acute. Sepals ovate-lanceolate, 5-7 mm. long, acute. 

 Petals 6-8 mm. long, a little exceeding the calyx, obovate, retuse. Stamens about 20. 



The name used by Eaton seems to have been overlooked altogether. It may be 

 claimed that leneophylla is only a misprint for Icucophylla, the original name, which, 

 however, is antedated by P. IcucopJtyJla Pallas, a synonym of P. nivea. The name P. 

 leneophylla, which means woolly-leaved, and is very appropriate, is not only found in 

 the fifth edition of Eaton's Manual, but also in the sixth and seventh editions, and in 

 Eaton & Wright's North American Botany. Watson in his Bibliographical Index gives 

 no reference to any of the editions of Eaton's Manual and cites Eaton & Wright as a 

 reference under P. leucopjhylla, which does not appear there. The Kew Index has also 

 omitted P. leneophylla, which should take the place of P. Hippiana, being a year older, 

 if it were not for the fact that it very likely is to be explained as a misprint. P. Hip- 

 piana is sometimes very hard to distinguish from P. effwsa, and the two seem to grade 

 into each other. P. Hipjpiana is, however, as a rule larger, silky as well as tomentose ; 

 the branches are more erect and the bractlets nearly equal the acute sepals. The 

 species grows on the plains and the foothills of the Rockies, but generally in richer 

 soil than P. effusa. It extends from New Mexico and Arizona to Minnesota and 

 Saskatchewan. 



