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great oxalis, great wood-sorrel, three leaf woodsorrel, trillium leaf oxalis, trillium-leaf wood-sorrel

Habit Herbs perennial, acaulous, rhizomes present, fleshy-thickened, densely scaly, stolons absent, bulbs absent.

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.


umbelliform cymes, 2–9(–15)-flowered;

scapes 15–25 cm, glabrous or sparsely villous.



sepal apices without tubercles;

petals white to pinkish, sometimes greenish proximally, without prominent veins, 8–14 mm.


narrowly fusiform, 15–25(–30) mm, glabrous.

Oxalis trilliifolia

Phenology Flowering May–Sep.
Habitat Redwood, spruce-fir, Douglas fir, hemlock, hemlock-cedar, hemlock-alder woodlands, stream margins, swamps.
Elevation 20–1800 m. (100–5900 ft.)
from FNA
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 12, p. 147.
Parent taxa Oxalidaceae > Oxalis
Sibling taxa
O. albicans, O. articulata, O. bowiei, O. brasiliensis, O. caerulea, O. californica, O. colorea, O. corniculata, O. debilis, O. decaphylla, O. dichondrifolia, O. dillenii, O. drummondii, O. florida, O. frutescens, O. grandis, O. hirta, O. hispidula, O. illinoensis, O. incarnata, O. intermedia, O. latifolia, O. laxa, O. macrantha, O. metcalfei, O. montana, O. oregana, O. pes-caprae, O. pilosa, O. purpurea, O. stricta, O. suksdorfii, O. texana, O. triangularis, O. violacea
Synonyms Hesperoxalis trilliifolia
Name authority Hooker: Fl. Bor.-Amer. 1: 118. (1831) — (as trilliifolium)
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