Potentilla anserina L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Perennial, at first acaulescent, with tufted basal lvs, soon emitting long stolons that root and produce similar but smaller clusters of lvs at the nodes; lvs oblanceolate, to 3 dm, pinnately compound with numerous lfls often alternating with other much smaller ones; lfls oblanceolate or narrowly elliptic, to 4 cm, increasing in size distally, sharply toothed, tomentose beneath and also silvery-sericeous with long appressed hairs, glabrous to sericeous above; stolons, pedicels and leaf-axes generally villous, the hairs often spreading; fls yellow, 1.5–2.5 cm wide, solitary on slender pedicels from the nodes of the stolons and sometimes from the original plant; bractlets often toothed; style lateral; achenes 2.5 mm, about as thick, deeply furrowed on the summit and back; 2n=28, 35, 42. Moist or wet, open places; circumboreal, s. to N.Y., n. Ind., Io., and N.M. May–Sept. (Argentina anserina)