Stems erect, usually simple, 1.5-10 dm, sparsely stipitate-glandular and pubescent; rhizomes slender to thickened; bulblets absent. Leaves usually whorled; petiole 0.5-1.6 cm, eciliate; blade lanceolate or ovate, 5-10 × 1-4 cm, base rounded to obtuse, decurrent, margins entire, plane, pubescent, apex acute, surfaces reddish-punctate at least marginally or apically, stipitate-glandular and densely pubescent; venation pinnate. Inflorescences axillary, solitary flowers or verticils. Pedicels 1-3.5 cm, pubescent and sometimes also stipitate-glandular. Flowers: sepals 5, calyx not streaked, 5-8 mm, stipitate-glandular at least apically, lobes narrowly lanceolate, margins thin; petals 5, corolla yellow, not streaked, rotate, 12-19.5 mm, lobes with margins entire, apex acute to rounded, stipitate-glandular marginally and sometimes also distally; filaments connate 2-2.5 mm, shorter than corolla; staminodes absent. Capsules 4-5.5 mm, dark reddish-punctate, glabrous. 2n = 30.
Flowering summer. Old fields, roadsides, stream banks; 0-600 m; introduced; B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que.; Conn., Del., Ill., Iowa, Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., Vt., Wis.; Europe.
Lysimachia punctata has been collected as an adventive on Prince Edward Island and once in Nebraska in 1971 from a colony that has been extirpated; it is often grown as an ornamental.
Erect, to 1 m, rarely branched, pubescent, spreading by stoloniform rhizomes; lvs chiefly in whorls of 3 or 4, occasionally only opposite, punctate, lanceolate, 5-10 cm; fls in axillary whorls, usually more numerous than the subtending lvs, the uppermost whorls with smaller lvs and shorter internodes; pedicels 1-2 cm; cal-lobes lance-linear, 5-8 mm; cor-lobes 12-16 mm, glandular-ciliolate on the margins; 2n=30. Native of Eurasia, now an occasional weed in our range, especially northward.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.