Flora of North America species comparison

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Oxalis oregana

Oregon oxalis, Oregon wood-sorrel, red wood-sorrel
Habit Herbs perennial, acaulous, rhizomes present, fleshy-thickened, densely scaly, stolons absent, bulbs absent.
Leaves

basal, clustered at rhizome tips;

petiole 5–15(–21) cm, sparsely to densely villous, hairs rusty;

leaflets 3, green, broadly obcordate, 10–30(–40) mm, lobed 1/5–1/4 length, lobes apically convex, surfaces sparsely villous, oxalate deposits absent.
Inflorescences

1-flowered;

scapes (6–)11–25 cm, glabrous or sparsely villous.
Flowers

heterostylous;

sepal apices without tubercles;

petals white to deep pink, usually with yellow spot sub-basally and prominent purple veins, (8–)15–25 mm.
Capsules

ovoid, 6–8(–12) mm, glabrate.

Oxalis oregana
Phenology Flowering Feb–Sep.
Habitat Douglas fir, mixed fir, cedar-spruce, mixed conifer, and hemlock-maple forests, maple woodlands, alder glens, Gaultheria thickets, stream banks.
Elevation 10–800(–1000) m. (0–2600(–3300) ft.)
Distribution
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Oxalis oregana has sometimes been treated as a disjunct geographical taxon of the European O. acetosella Linnaeus (see comments under 21. O. montana).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 148.
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. pes-caprae, O. pilosa, O. purpurea, O. stricta, O. suksdorfii, O. texana, O. triangularis, O. trilliifolia, O. violacea
Synonyms O. acetosella subsp. oregana, O. oregana var. smalliana, O. oregana var. tracyi, O. smalliana
Name authority Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 211. (1838)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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