Oxalis pes-caprae |
Oxalis decaphylla |
|
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African wood-sorrel, Bermuda buttercup, soursob |
ten-leaf wood-sorrel |
|
Habit | Herbs perennial, acaulous, rhizomes present vertical, white, rootlike, stolons absent, bulb usually solitary, sometimes with bulblets at base; bulb scales not observed. | Herbs perennial, acaulous, rhizomes and stolons absent, bulbs solitary or clustered; bulb scales 9–15+-nerved. |
Leaves | basal, rarely absent at flowering; petiole 3–12 cm; leaflets 3, green, rarely mottled with purplish red spots, angular-obcordate, (5–)7–20 mm, lobed 1/4–2/5 length, lobes apically convex, margins and abaxial surface villous, adaxial surface glabrous, oxalate deposits absent. |
basal, rarely absent at flowering; petiole 7–32(–46) cm; leaflets (3–)5–11, green to purplish abaxially, green adaxially, sometimes with purplish transverse medial band, narrowly oblong-oblanceolate to narrowly oblong or linear, (10–)12–38(–72) mm, lobed (1/6–)1/2–2/3(–9/10) length, lobes apically subacute, surfaces glabrous, oxalate deposits absent. |
Inflorescences | umbelliform cymes, 2–12(–20)-flowered; scapes often becoming fistulose proximally, 15–30 cm, sparsely villous to pilose. |
umbelliform cymes, (2–)6–11(–15)-flowered; scapes 7–35 cm, glabrous. |
Flowers | tristylous in diploids and tetraploids, consistently short-styled in pentaploids; sepal apices with 2 orange tubercles; petals deep golden yellow, 15–20 mm. |
distylous; sepal apices with 2 orange, linear, thick tubercles; petals green proximally, rose purple or lavender to pink, rarely white, distally, with green veins, (7–)9–17(–22) mm. |
Capsules | not seen. |
ellipsoid, 3–11 mm, glabrous. |
2n | = 14, 28, 35. |
= 28, 56. |
Oxalis pes-caprae |
Oxalis decaphylla |
|
Phenology | Flowering Nov–Apr. | Flowering Jun–Aug. |
Habitat | Disturbed areas, orchards, fields, grasslands, oak woodlands, coastal sage, dunes. | Sycamore-walnut, oak, pine-oak, ponderosa pine, pine-spruce-aspen, or spruce-fir woodlands, canyons, meadows, seeps, streamsides. |
Elevation | 10–500 m. (0–1600 ft.) | (1700–)2200–3000(–3200) m. ((5600–)7200–9800(–10500) ft.) |
Distribution |
AZ; CA; s Africa [Introduced in North America; introduced also in West Indies, Bermuda, South America, Europe, Asia (China, Iran, Turkey), n Africa, Australia]
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AZ; NM; n Mexico; c Mexico
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Discussion | Outside its native range, Oxalis pes-caprae is mostly represented by a sterile pentaploid morph, although tetraploids also are known. The occurrence of both pentaploid and tetraploid individuals in the exotic range may be the result of independent introductions (P. Michael 1964; R. Ornduff 1986). Fruit production has not been observed in North America, and the plants are assumed to be seed-sterile (Ornduff 1987). Bulbs of O. pes-caprae are rarely collected, as they detach easily from the vertical, rootlike stems. Each bulb may produce over 20, small, whitish bulblets each year. Bulblets may also be formed at the soil surface crown. Oxalis pes-caprae was reported by J. K. Small (1933) to occur in waste places and cultivated grounds in northern Florida, but as noted by D. B. Ward (2004), no Florida specimens are known. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 12, p. 146. | FNA vol. 12, p. 149. |
Parent taxa | Oxalidaceae > Oxalis | Oxalidaceae > Oxalis |
Sibling taxa | ||
Synonyms | O. cernua | O. grayi |
Name authority | Linnaeus: Sp. Pl. 1: 434. (1753) | Kunth: in A. von Humboldt et al., Nov. Gen. Sp. 5(fol. & qto.): plate 468. (1822) |
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