Oxalis laxa |
Oxalis hispidula |
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dwarf wood-sorrel |
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Habit | Herbs annual, caulescent, sometimes densely cespitose, rhizomes and stolons absent, bulbs absent. | Herbs perennial, acaulous, rhizomes and stolons absent, bulbs solitary or clustered; mostly 8–15 mm diam.; outer bulb scales 3[–5]-nerved, inner scales thick, reddish brown, rugose. |
Aerial stems | 1–5 from base, erect, 0.5–7 cm, usually herbaceous, sometimes becoming ± woody proximally, hirtellous to villous-hirtellous. |
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Leaves | cauline; stipules rudimentary; petiole 1.5–6 cm; leaflets 3, green, obcordate, 5–12 mm, lobed 1/5 length, lobes apically convex, surfaces glabrous, oxalate deposits absent. |
basal; petiole 1.5–15 cm, sparsely villous or glabrous; leaflets 3, green, rounded-obcordate, 4–18 mm, lobed 1/6–1/5 length, lobes apically convex to nearly truncate, margins prominently ciliate, hairs stiff, sharp-pointed, abaxial surface strigose to hirsute-strigose, densely hirsute at very base, adaxial surface glabrous, oxalate deposits absent. |
Inflorescences | racemes, 6–14-flowered; peduncles 3–15 cm. |
umbelliform cymes, 1(–2)[–4]-flowered; scapes 3–27 cm, glabrous or sparsely hirsute-villous proximally. |
Flowers | heterostylous; sepal apices without tubercles; petals yellow, 6–12 mm. |
apparently tristylous (mid-styled flowers observed); sepals yellowish green, apices with 2 orange, elongate tubercles; petals yellow basally, otherwise deep rose to purple or violet, with dark purple veins proximally, 11–20 mm. |
Capsules | ovoid to spheric, 3–5 mm, puberulent. |
fusiform, mature size not observed, indumentum not seen. |
Oxalis laxa |
Oxalis hispidula |
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Phenology | Flowering Apr–Jun. | Flowering Oct–Nov. |
Habitat | Disturbed sites, riparian woodlands, riverbanks, gravelly beaches, rock crevices, foothill woodlands. | Wet ditches, disturbed roadsides. |
Elevation | 10–800 m. (0–2600 ft.) | 10–90 m. (0–300 ft.) |
Distribution |
CA; South America (Chile) [Introduced in North America] |
AL; South America (Argentina, Brazil, Paraguay, Uruguay) [Introduced in North America] |
Discussion | Oxalis laxa is widespread in California in the eastern part of the Central Valley and along the central coast. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oxalis hispidula is naturalized in Baldwin County (H. E. Horne et al. 2013). The species is recognized by its leaves without oxalate deposits, outer bulb scales with mostly three nerves, flowers one (or two) per scape, and corollas violet-purple with dark veins. It was noted by S. Rosenfeldt and B. G. Galati (2009) to be tristylous. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 145. | FNA vol. 12, p. 152. |
Parent taxa | Oxalidaceae > Oxalis | Oxalidaceae > Oxalis |
Sibling taxa | ||
Synonyms | O. corniculata var. sericea, O. micrantha, O. radicosa, O. simulans | |
Name authority | Hooker & Arnott: Bot. Beechey Voy., 13. (1830) | Zuccarini: Denkschr. Königl. Akad. Wiss. München 9: 143. (1825) |
Web links |