Plants not stoloniferous. Flowering stems 15-50(-65) cm. Leaves: petiole 3-10(-19) cm, short stipitate-glandular and sparsely long stipitate-glandular, longer hairs spreading or retrorse, white or reddish brown; blade cordate-ovate or triangular-cordate, longer than or ± as long as wide, 1.3-7.7(-9) × 1.2-7.1(-8) cm, margins 5- or 7-lobed, irregularly crenate or dentate, uniformly ciliate, apex of terminal lobe acute, surfaces short stipitate-glandular and sparsely long stipitate-glandular; cauline leaves absent or 1-2, proximal, alternate, petiolate, 0.3-3 × 0.3-1.6 cm. Inflorescences 1-3, closely to remotely 8-35-flowered, 1(-2) flowers per node, weakly secund or not secund, 15-50(-65) cm, short stipitate-glandular and sparsely long stipitate-glandular proximally, short stipitate-glandular distally. Pedicels 0.2-1.5 mm, short stipitate-glandular. Flowers: hypanthium obconic-campanulate, 1.2-1.8 × 1.4-2.2 mm; sepals erect or spreading, whitish, oblong-ovate to oblong-triangular or triangular, (0.6-)0.9-1.2 × 0.6-1 mm; petals white, sometimes pink or purple tinged, 3-5-lobed, 1-1.5 mm, lobes linear, lateral lobes ascending; stamens 5, opposite sepals; filaments white, 0.2-0.3 mm; anthers 0.1-0.2 × 0.1-0.2 mm; ovary at least 3/4 inferior; styles spreading, flattened, 0.1-0.2 mm; stigmas indistinctly 2-lobed. Seeds dark reddish brown or blackish, 0.8-1.4 mm, pitted. 2n = 14.

Flowering May-Jul. Moist woods, stream banks; 500-2000 m; Calif., Oreg., Wash.

Mitella diversifolia occurs from Klickitat County, Washington, south to El Dorado County, California.