Bigflower Cinquefoil

Drymocallis fissa (Nutt.) Rydb. Mem. Dep. Bot. Columbia
Univ. 2 : 197. 1898.
Potentilla fissa Nutt.; T. & G. Fl. N. Am. 1 : 446. 1840. Potenlilla glandulosa S. Wats. Proc. Am. Acad. 8: 552, in part. 1873. Potentilla arguta Porter & Coult. Syn. Fl. Colo. 36, in part. 1874. Potenlilla scopulorum Greene, Erythea 1 : 4. 1893.
Stem low, 2-3 dm., or sometimes 4 dm. high, very leafy and branched, glandularhirsute throughout ; stipules very wide, broadly ovate to subreniform, acute and generally deeply toothed; basal leaves with short petioles, very veiny and slightly hairy on both sides, or subglabrous above, pinnate ; leaflets, as a rule, 9, nearly orbicular, except the upper ones, which are somewhat rhombic, all deeply incised and doubly serrate ; stemleaves similar, only the upper ones slightly reduced ; flowers large, 15-20 mm. in diameter, in a narrow cyme, often in the axils of the leaves far down ; hy pan thium densely glandularviscid ; bractlets linear to lance-ovate, the broader ones sometimes toothed, shorter than the triangular-lanceolate, longacuminate sepals, which are 5-6 mm. long, often 1 cm. long in fruit ; petals orbicular, very concave, much exceeding the sepals ; stamens about 30 ;
pistils numerous ; styles fusiform.
Type locality : " Plains of the Rocky Mountains towards the Oregon." Distribution : Black Hills of South Dakota to Alberta, Utah, and Colorado.