Stems erect, simple or sometimes branched, 2-13 dm, glabrous; rhizomes slender or somewhat thickened; bulblets absent. Leaves opposite; petiole 0.5-6 cm, long-ciliate along entire length, cilia 0.6-2.1 mm; blade broadly lanceolate to ovate-lanceolate, 4-15 (-17) × 1.5-6.5 cm, base rounded or obtuse to cuneate, somewhat decurrent, margins entire, plane, ciliolate, especially proximally, apex acute to acuminate, surfaces not punctate, glabrous; venation pinnate-arcuate. Inflorescences axillary in distal leaves, solitary flowers. Pedicels (0.5-)1.5-7 cm, usually stipitate-glandular. Flowers: sepals 5, calyx not streaked, 2.5-9 mm, sometimes stipitate-glandular, lobes lanceolate, margins thin; petals 5, corolla yellow, sometimes with reddish base, not streaked, rotate, 5-12 mm, lobes with margins sometimes slightly erose apically, apex mucronate, stipitate-glandular adaxially; filaments connate to 0.3 mm, shorter than corolla; staminodes 1-2 mm. Capsules 5-7 mm, not punctate, glabrous. 2n = 34, 92, 96, 100, 108, 112.
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Erect, 4–13 dm, rhizomatous; lvs ovate to lanceolate, 4–14 × 1.5–6 cm, the base rounded (or even subcordate) or obtuse to cuneate, the petiole 0.5–5 cm, evidently ciliate its whole length; fls solitary in the upper axils, on pedicels 1.5–6.5 cm; cal-lobes 3.5–9 × 1.5–4.5 mm, with 3–5 parallel often reddish-brown veins; cor-lobes 5–12 × 3–9 mm; stamens distinct; staminodes linear or subulate; 2n=34, 92, 96, 100, 108, 112. Moist or wet low ground, in shade or sun; N.S. and Que. to B.C. and Alas., s. to Ga., La., N.M., and Oreg. May–Sept. (Steironema c.)
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