Stolons white or tan, 0.3–1 mm diam., glabrous. Flowering stems ascending to erect, branching in distal 1/4–1/2, 8–27 cm, glabrous. Leaves usually opposite, sometimes alternate distally, membranous. Stolon leaves: petiole 3–10 mm, glabrous; blade ovate to depressed-ovate or flabellate, 5–17(–20) × (3–)6–16 mm, base truncate to cuneate, margins 9–17(–21)-crenate or -crenate-dentate, not purple-spotted, glabrous, surfaces glabrous abaxially and adaxially. Cauline leaves 2–9; petiole 0.2–10 mm, glabrous; blade ovate to depressed-ovate or flabellate, 5–17(–20) × (3–)6–16 mm, base truncate to cuneate, margins 9–17(–21)-crenate or -crenate-dentate, glabrous, surfaces glabrous abaxially and adaxially. Inflorescences terminal or axillary solitary flowers or 3–20-flowered, open cymes; bracts green, not purple-spotted, foliaceous, ovate to flabellate, 2–9 × 2–8 mm, margins 5–9-crenate. Pedicels absent or 0.1–1.8(–3) mm. Flowers: hypanthium green, not purple-spotted, turbinate, 0.8–1.8 × 1.5–3 mm, glabrous; sepals spreading to erect, green, not purple-spotted, sometimes reddish brown-spotted distally, broadly ovate, 1–1.5 × 1.1–1.8 mm, apex obtuse to rounded; nectary disc conspicuous, green or purple, 8-lobed; stamens 8, 0.4–0.8 mm; anthers yellow, 0.1–0.3 × 0.2–0.4 mm; styles 0.3–0.4 mm. Seeds 10–20, dark brown, ovoid to ellipsoid, 0.7–1 mm, glabrous. 2n = 18.
Phenology: Flowering Feb–May.
Habitat: Marshy ground, seeps, springs, bogs, streamsides
Elevation: 0-900 m
Calif., Oreg., Wash.