Jepson eFlora: Taxon page
Vascular Plants of California
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Oxalis pes-caprae
BERMUDA BUTTERCUP


Higher Taxonomy
Family: OxalidaceaeView Description 
Common Name: OXALIS FAMILY
Habit: Annual, perennial herb [vine, shrub, tree]. Leaf: compound (palmate [pinnate, or leaflet 1]), alternate, often +- basal in rosettes or at stem or rhizome tips in clusters, generally petioled, stipules generally 0, leaflets generally sessile. Inflorescence: cyme, umbel- or raceme-like or not, or flowers 1, 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[15], fused below, of 2 lengths; pistil 1, ovary superior, chambers [3]5, placentas axile, styles [1]5, generally +- free. Fruit: generally capsule, loculicidal. Seed: generally arilled.
Genera In Family: 5 genera, number of species uncertain: especially temperate. Note: Often heterostylous.
eFlora Treatment Author: Robert E. Preston & Robert Ornduff
Scientific Editor: Thomas J. Rosatti.
Genus: OxalisView DescriptionDichotomous Key


Habit: Roots fibrous or woody; bulbs, tubers, or rhizomes often present. Stem: +- 0 or not. Leaf: stipules 0 or small; leaflets 3, generally +- obcordate [not], generally entire, generally green. Flower: petals clawed; styles erect or curved. Fruit: cylindric to spheric, explosively dehiscent. Seed: flat, often ridged; aril translucent.
Species In Genus: 500--950 species: especially temperate. Etymology: (Greek: sour, from acidic taste) Note: Taxonomy difficult, needs study; generally heterostylous; many (especially aliens in California except Oxalis micrantha) ornamental; some noxious weeds; oxalates may be TOXIC to livestock; Oxalis latifolia Kunth possibly naturalized in CCo (Keil 30389, just north of San Simeon), differs from Oxalis purpurea in having flowers in umbel-like cyme; Oxalis hirta L. an historical waif (no recent collections), excluded.
Reference: Lourteig 2000 Bradea 7:201--629
Unabridged Reference: Eiten 1963 Amer Midl Naturalist 69:257--309; Lourteig 1975 Phytologia 42:57--1979; Turner 1994 Phytologia 77:1--7
Oxalis pes-caprae L.
NATURALIZED
Habit: Perennial herb; bulbs many on rhizomes, root tips, < 2.5 cm, white to brown. Stem: generally underground, vertical, short. Leaf: < 40, in loose +- basal rosette at enlarged stem tip; petiole < 12 cm; leaflets < 3.5 cm, often purple-spotted, abaxially hairy. Inflorescence: umbel-like, < 20-flowered; peduncle < 30 cm. Flower: sepals < 7 mm, lanceolate to oblong, tips often with 2 orange tubercles; petals < 2.5 cm, yellow; filaments < 7 mm, hairy. Fruit: 0 in California.
Ecology: Disturbed areas, roadsides, grassland, dunes; Elevation: < 820 m. Bioregional Distribution: NCo, NCoRO, n SNF, ScV, CW (exc SCoRI), SW (exc SnJt); Distribution Outside California: worldwide alien; native to southern Africa. Toxicity: Possibly TOXIC in quantity to sheep. Flowering Time: Jan--May Note: Cult as ornamental; common garden weed.
Synonyms: Oxalis cernua Thunb.
Jepson eFlora Author: Robert E. Preston & Robert Ornduff
Reference: Lourteig 2000 Bradea 7:201--629
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Weed listed by Cal-IPC

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Botanical illustration including Oxalis pes-caprae

botanical illustration including Oxalis pes-caprae

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Citation for this treatment: Robert E. Preston & Robert Ornduff 2012, Oxalis pes-caprae, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=35642, accessed on December 12, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on December 12, 2019.

Oxalis pes-caprae
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© 2016 Aaron E. Sims and CNPS
Oxalis pes-caprae
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© 2009 Barry Rice
Oxalis pes-caprae
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© 2007 Neal Kramer
Oxalis pes-caprae
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© 2006 George W. Hartwell
Oxalis pes-caprae
click for enlargement
© 2016 Aaron E. Sims and CNPS
Oxalis pes-caprae
click for enlargement
© 2009 Barry Rice

More photos of Oxalis pes-caprae in CalPhotos



Geographic subdivisions for Oxalis pes-caprae:
NCo, NCoRO, n SNF, ScV, CW (exc SCoRI), SW (exc SnJt)
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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Data provided by the participants of the  Consortium of California Herbaria.
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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.