Jepson Flora Project: Jepson Interchange    

 
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

OXALIDACEAE

OXALIS FAMILY

Robert Ornduff

Annual to tree
Leaves compound (palmate, pinnate, or leaflet 1), alternate, often ± basal in rosettes or in clusters at stem or rhizome tips, generally petioled; stipules generally 0; leaflets generally sessile
Inflorescence: cyme, sometimes umbel- or raceme-like, or flowers solitary, generally in axils; peduncle bracted
Flower generally bisexual, radial; sepals 5, free or fused at base; petals 5, free or fused above base; stamens 10 or 15, fused below, of 2 lengths; pistil 1, ovary superior, chambers 3–5, placentas axile, styles 1–5, generally ± free
Fruit: generally capsule, loculicidal
Seeds generally with aril
Genera in family: 8 genera, 575 species: especially temp. Often heterostylous.

OXALIS

Annual, perennial herb, shrub; roots fibrous or woody; bulbs, tubers, or rhizomes often present
Stem sometimes 0 or very short
Leaf petioled: stipules 0 or small; leaflets 3, generally ± obcordate in CA, generally entire, generally green
Flower: petals clawed; stamens 10; ovary chambers 5, styles 5, free, erect or curved
Fruit cylindric to spheric, explosively dehiscent
Seeds flat, often ridged; aril translucent
Species in genus: ± 480 species: especially temp
Etymology: (Greek: sour)
Reference: [Eiten 1963 Amer Midl Nat 69:257–309; Lourteig 1975 Phytologia 42:57–197]
Generally heterostylous; many (especially aliens in CA except O. laxa ) fine ornamental; some noxious weeds; contained oxalates may be toxic to livestock.

Introduced

O. pes-caprae L.

BERMUDA BUTTERCUP

Perennial; bulbs < 2.5 cm, pale brown
Stem mostly underground, vertical, short, often with bulblets, whitish
Leaves < 40, in loose ± basal rosette at enlarged stem tip; petiole < 12 cm; leaflets < 3.5 cm, often spotted, lower surface hairy
Inflorescence umbel-like, < 20-flowered; peduncle < 30 cm
Flower: sepals < 7 mm, lanceolate to oblong, tips often with 2 orange or yellow tubercles; petals < 2.5 cm, yellow; filaments < 7 mm, hairy
Fruit 0 in CA
Ecology: Disturbed areas, grasslands
Elevation: < 500 m.
Bioregional distribution: North Coast, Outer North Coast Ranges, Central Coast, San Francisco Bay Area, Outer South Coast Ranges, South Coast
Distribution outside California: native to s Africa
Synonyms: O. cernua Thunb
Cult as ornamental. Fls late fall to early summer. Weedy Possibly toxic in quantity to sheep.

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