Oxalis dillenii |
Oxalis trilliifolia |
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common yellow wood-sorrel, Dillen's oxalis, graygreen sorrel, slender yellow wood-sorrel, southern yellow wood-sorrel |
great oxalis, great wood-sorrel, three leaf woodsorrel, trillium leaf oxalis, trillium-leaf wood-sorrel |
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Habit | Herbs perennial, caulescent, rhizomes present (sometimes appearing taprootlike), stolons absent, bulbs absent. | Herbs perennial, acaulous, rhizomes present, fleshy-thickened, densely scaly, stolons absent, bulbs absent. |
Aerial stems | (1–)2–8 from base, erect initially, often becoming decumbent or prostrate and stolonlike, rarely rooting at nodes, 10–25 cm, usually herbaceous, sometimes becoming woody proximally, densely and evenly strigillose to strigose from base to peduncles and pedicels, hairs straight, antrorsely appressed, nonseptate, sharp-pointed. |
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Leaves | basal and cauline; stipules oblong, margins narrowly flanged or without free portions, apical auricles absent; petiole 1–4 cm, hairs nonseptate; leaflets 3, green, obcordate, (4–)6–15(–21) mm, lobed 1/5–1/3 length, abaxial surface sparsely strigillose, adaxial surface glabrous, oxalate deposits 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. |
Inflorescences | usually umbelliform cymes, rarely irregular cymes, 1–3(–8)-flowered; peduncles 1–6(–10) cm. |
umbelliform cymes, 2–9(–15)-flowered; scapes 15–25 cm, glabrous or sparsely villous. |
Flowers | mostly homostylous; sepal apices without tubercles; petals yellow, without red lines, (2.5–)4–8 mm. |
heterostylous; sepal apices without tubercles; petals white to pinkish, sometimes greenish proximally, without prominent veins, 8–14 mm. |
Capsules | angular-cylindric, abruptly tapering to apex, 12–20(–25) mm, densely strigose-pilose, hairs both appressed and spreading, with puberulent understory. |
narrowly fusiform, 15–25(–30) mm, glabrous. |
Seeds | brown, transverse ridges with strong grayish or white lines. |
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2n | = 18, 20, 22, 24. |
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Oxalis dillenii |
Oxalis trilliifolia |
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Phenology | Flowering Feb–May(–Oct). | Flowering May–Sep. |
Habitat | Pastures, roadsides, lawns, river bottoms, sandy, rocky, or gravelly soils. | Redwood, spruce-fir, Douglas fir, hemlock, hemlock-cedar, hemlock-alder woodlands, stream margins, swamps. |
Elevation | 0–300 m. (0–1000 ft.) | 20–1800 m. (100–5900 ft.) |
Distribution |
AL; AR; AZ; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; BC; MB; NB; NS; ON; PE; QC; SK [Introduced in Bermuda, Europe]
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CA; ID; OR; WA
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Discussion | Decumbent stems of Oxalis dillenii often appear stolonlike, producing erect branches and leaves at the nodes, rarely producing a few adventitious roots. Such plants sometimes are misidentified as O. corniculata, but they differ in their overall habit, stems and rhizomes that become woody, reduced stipules, strigillose cauline vestiture, denser fruit vestiture, and seed color. Plants of O. dillenii in Canada and the western United States appear to be adventive. Plants of Oxalis dillenii flowering into November and December in Texas and North Carolina, and probably elsewhere, characteristically are depressed in habit, with creeping stems and forming matlike colonies. The corollas are small, with petals 2.5–3 mm. Although similar in habit to typical O. corniculata, these plants do not have stems that root at nodes, and the strigillose vestiture, though reduced in density, and the stipule morphology are like O. dillenii. Whether these are the same genotype as spring-flowering plants or a different entity remains to be investigated. At least some of the variability in O. dillenii, particularly in habit, may be genetically partitioned, as dysploid chromosome races apparently exist. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 12, p. 140. | FNA vol. 12, p. 147. |
Parent taxa | Oxalidaceae > Oxalis | Oxalidaceae > Oxalis |
Sibling taxa | ||
Synonyms | O. corniculata var. dillenii, O. dillenii var. radicans, O. florida subsp. prostrata, O. lyonii, O. prostrata, Xanthoxalis dillenii | Hesperoxalis trilliifolia |
Name authority | Jacquin: Oxalis, 28. (1794) | Hooker: Fl. Bor.-Amer. 1: 118. (1831) — (as trilliifolium) |
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