Potentilla sect. Biflorae
± erect, not flagelliform, not rooting at nodes, lateral to persistent basal rosettes, (0.1–)0.5–1(–1.5) dm, lengths 1.5–3 times basal leaves.
basal sometimes 2-ranked;
cauline leaves 0(–1);
primary leaves ternate, appearing ± palmate, 2–7 cm;
petiole: long hairs absent or spreading to ascending, weak, glands usually absent;
leaflets 3, at tip of leaf axis, separate, cuneate-ovate in outline, margins strongly revolute, central leaflets divided nearly to base into 3 equal lobes, lateral divided nearly to base into 2 lobes, lobes entire, rarely again 2-fid, surfaces ± dissimilar, abaxial whitish with thick waxy bloom, cottony hairs absent, adaxial light green, often purple-tinged, not glaucous, long hairs weak or absent.
solitary flowers or 2–3(–4)-flowered, ± cymose, open.
straight in fruit, 0.5–1.5(–2) cm, proximal not much longer than distal.
5-merous;
hypanthium 2–2.5 mm diam.;
petals pale yellow to yellow, ± obcordate, 6–10 mm, longer than sepals, apex retuse;
stamens ca. 20;
styles subapical, filiform-tapered, not papillate-swollen proximally, 2.5–4 mm.
smooth.
Potentilla sect. Biflorae
Species 1.
Although sect. Biflorae deviates from the main body of Potentilla and superficially resembles the mainly Asian genus Dasiphora in shoot and leaf architecture and in some floral features, molecular analyses place the species unequivocally in the Potentilla clade, not in the Fragaria clade with Dasiphora (C. Dobeš and J. Paule 2010; M. H. Töpel et al. 2011).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
