Flora of North America species comparison

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Oxalis trilliifolia

Oxalis suksdorfii

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

Suksdorf woodsorrel, Suksdorf's oxalis, Suksdorf's wood-sorrel, western yellow oxalis, western yellow wood-sorrel
Habit Herbs perennial, acaulous, rhizomes present, fleshy-thickened, densely scaly, stolons absent, bulbs absent. Herbs perennial, caulescent, rhizomes present long, stolons absent, bulbs absent.
Aerial stems

1(–3) from base, mostly erect, 10–25 cm, herbaceous, sparsely to moderately villous, hairs nonseptate and usually septate.
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.

cauline;

stipules rudimentary;

petiole (2–)3–5(–6) cm, hairs septate and nonseptate;

leaflets 3, green, obcordate, (8–)10–16(–20) mm, lobed 1/5–1/3 length, margins green, surfaces glabrous to sparsely strigose, oxalate deposits absent.
Inflorescences

umbelliform cymes, 2–9(–15)-flowered;

scapes 15–25 cm, glabrous or sparsely villous.

umbelliform cymes, 1–3-flowered;

peduncles (2–)4–8(–10) cm.
Flowers

heterostylous;

sepal apices without tubercles;

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

tristylous, above level of leaves;

sepal apices without tubercles;

petals yellow, 12–20 mm.
Capsules

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

oblong-cylindric, 10–15 mm, densely puberulent.
2n

= 24.

Oxalis trilliifolia

Oxalis suksdorfii
Phenology Flowering May–Sep. Flowering May–Aug.
Habitat Redwood, spruce-fir, Douglas fir, hemlock, hemlock-cedar, hemlock-alder woodlands, stream margins, swamps. Open woods, fir, Douglas fir-oak woodlands, dry shrublands, roadsides, disturbed areas.
Elevation 20–1800 m. (100–5900 ft.) 0–700 m. (0–2300 ft.)
Distribution
from FNA
CA; ID; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 12, p. 147. FNA vol. 12, p. 145.
Parent taxa Oxalidaceae > Oxalis 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
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. texana, O. triangularis, O. trilliifolia, O. violacea
Synonyms Hesperoxalis trilliifolia Xanthoxalis suksdorfii
Name authority Hooker: Fl. Bor.-Amer. 1: 118. (1831) — (as trilliifolium) Trelease: Mem. Boston Soc. Nat. Hist. 4: 89. (1888)
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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