Trillium-leaf wood-sorrel Trillium-leaf wood-sorrel

Hesperoxalis trilliifolia (Hooker) Small

Herbs perennial, acaulous, rhizomes present, <fleshy-thickened, densely scaly>, stolons absent, bulbs absent. Leaves basal, <clustered at rhizome tips>; petiole 15–30 cm; leaflets 3, green, broadly obcordate, 20–40(–60) mm, lobed 1/6–1/4 length, <lobes apically convex>, surfaces sparsely villous, oxalate deposits absent. Inflorescences umbelliform cymes, 2–9(–15)-flowered; scapes 15–25 cm, glabrous or sparsely villous. Flowers heterostylous; sepal apices without tubercles; petals white to pinkish, sometimes greenish proximally, without prominent veins, 8–14 mm. Capsules narrowly fusiform, 15–25(–30) mm, glabrous.

Flowering May–Sep. Redwood, spruce-fir, Douglas fir, hemlock, hemlock-cedar, hemlock-alder woodlands, stream margins, swamps; 20–1800 m; Calif., Idaho, Oreg., Wash.