Potentilla candicans Humb. & Bonpl. ex Schltdl.

Potentilla candicans Humb. & Bonpl.; Schlecht. Ges. Nat
Freunde Berlin Mag. 7 : 285. 1815.
Potentilla candicans nana Humb. & Bonpl.; Nestler, Monog. Potent. 34. 1816. Potentilla Humboldtiana Tratt. Ros. Monog. 4: 41. 1824. Potentilla lineariloba Seringre, in DC. Prodr. 2 : 582. 1825. Potentilla candicans crocea Lehm. Rev. Potent. 32. 1856.
Perennial, with a thick ligneous root and short caudex ; stem from 0.5 to 3 dm. high, with few reduced leaves, more or less white-silky ; basal leaves numerous, silvery-white, pinnate, with 6-10 pairs of deeply dissected leaflets ; segments narrowly linear and more or less revolute ; bractlets oblong, about half as long as the ovate or broadly lanceolate sepals, which are about 5 mm. long ; petals yellow or (in var. crocea) orange, broadly obcordate, a little exceeding the sepals ; style filiform.
Type locality : Tianguillo, between Mexico and Toluca.
Distribution : Central Mexico.