Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon

Oxalis oregana

Higher Taxonomy
Family: OxalidaceaeView Description 

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.
Oxalis oregana Nutt.
Habit: Perennial herb; rhizome creeping, fleshy, scaly; bulbs 0. Stem: +- 0. Leaf: < 10, clustered at rhizome tips; petiole < 20 cm, hairy; leaflets < 4 cm, often +- purple abaxially, midribs pale. Inflorescence: flowers 1; peduncle < 15 cm, bracts 2, near tip. Flower: sepals < 1 cm, lanceolate; petals < 2.5 cm, white to deep pink. Fruit: < 12 mm, +- ovoid.
Ecology: Moist conifer forest; Elevation: < 1000 m. Bioregional Distribution: NCo, w KR, NCoRO, CCo, SnFrB; Distribution Outside California: to Washington. Flowering Time: Feb--Aug
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)

Previous taxon: Oxalis micrantha
Next taxon: Oxalis pes-caprae

Name Search

Botanical illustration including Oxalis oregana

botanical illustration including Oxalis oregana

Please use this Google Form for Contact/Feedback

Citation for this treatment: Robert E. Preston & Robert Ornduff 2012, Oxalis oregana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 03, 2023.

Citation for the whole project: Jepson Flora Project (eds.) 2023, Jepson eFlora,, accessed on October 03, 2023.

Oxalis oregana
click for enlargement
© 2008 Neal Kramer
Oxalis oregana
click for enlargement
© 2021 Steve Matson
Oxalis oregana
click for enlargement
© 2009 Neal Kramer
Oxalis oregana
click for enlargement
© 2016 Steve Matson
Oxalis oregana
click for enlargement
© 2021 Neal Kramer
Oxalis oregana
click for enlargement
© 2021 Steve Matson

More photos of Oxalis oregana in CalPhotos

Geographic subdivisions for Oxalis oregana:
NCo, w KR, NCoRO, CCo, SnFrB
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
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.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

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 (fruiting time in some monocot genera).