Ranunculus hydrocharis Spenner f. lobbii Hiern, J. Bot. 9: 66. 1871

Stems glabrous. Leaves laminate and filiform-dissected; laminate leaf blades reniform in outline, deeply 3-parted, 0.5-0.8 × 0.9-1.5 cm, segments elliptic or obovate, margins sometimes notched; filiform-dissected leaves sometimes few and inconspicuous, stipules gradually tapering upward, connate for whole length, mostly petiolate. Flowers: receptacle glabrous; sepals spreading, 2-3 × 1-1.5 mm, glabrous; petals 5, 4-6 × 2-5 mm; style 1-1.5 mm. Fruiting pedicels recurved. Heads of achenes hemispheric, 3 × 4-5 mm; achenes 2-2.4 × 1.4-1.8 mm, glabrous; beak deciduous, sometimes leaving stub to 0.2 mm.

Flowering late winter-spring (Mar-May). Shallow ponds and vernal pools; 0-300 m; B.C.; Calif., Oreg.