Cardamine rariflora M. Peck

Perennials; glabrous throughout. Rhizomes (tuberiform, fragile), 4-9(-11) mm diam., (fleshy). Stems erect or decumbent at base, unbranched, 2-6(-7.5) dm. Rhizomal leaves 5-13-foliolate, (4-)10-18(-25) cm, leaflets petiolulate or subsessile; petiole (3-)5-12(-17) cm; lateral leaflets subsessile, blade similar to terminal, sometimes smaller; terminal leaflet (petiolule 0.4-0.7 cm), blade oblong to elliptic or ovate, (0.4-)0.7-1.7(-2) cm, base cuneate or obtuse, margins entire or obscurely 3-lobed. Cauline leaves 2-6, 5-11-foliolate, petiolate, leaflets petiolulate or sessile; petiole 3-10 cm, base not auriculate; lateral leaflets sessile, blade similar to terminal, smaller; terminal leaflet (petiolule 0.5-1.5 cm), blade narrowly ovate or oblong to oblanceolate, 1.5-3.5 cm × 2-15 mm, margins entire or toothed to 3-lobed. Racemes ebracteate. Fruiting pedicels ascending to divaricate, (10-)20-40(-60) mm. Flowers: sepals oblong to ovate, 3.5-5 × 1.8-2.5 mm, lateral pair saccate basally; petals white, obovate, 12-16 × 6-8 mm, (not clawed, apex rounded or subemarginate); filaments: median pairs 6-7 mm, lateral pair 4-5 mm; anthers oblong, 1.5-1.8 mm. Fruits linear, 2.5-4.5 cm × 1.4-2 mm; ovules 12-24 per ovary; style 4-6 mm. Seeds brown, oblong, 1.8-2 × 1-1.5 mm.

Flowering Mar-May. Shallow pools, wet grounds, marshes, meadows, creeks, channels, swampy woods; 50-150 m; Oreg.

Cardamine penduliflora is known from Douglas County north into Benton, Lane, Marion, Polk, and Yamhill counties.