Page author: David Giblin
Oxalis stricta
upright yellow wood-sorrel

Distribution: Distributed on both sides of the Cascades in Washington, more common west of the Cascades; widely distributed throughout North America.

Habitat: Disturbed ground, lawns and gardens.

Flowers: April-September

Origin: Introduced

Conservation Status: Not of concern


Perennial from widespread, slender, fleshy rhizomes, the stems to 5 dm. tall, erect to prostrate, pubescent to glabrous.


Leaves alternate, long-petiolate, trifoliate; leaflets 1-5 cm. long, obcordate, drooping, usually glabrous; stipules lacking.


Flowers 2-7, long pedicellate, on axillary peduncles that exceed the leaves; sepals 5; petals 5, yellow, 4-9 mm. long; stamens 10, united at the base, 5 filaments longer than the other 5; styles 5.


Capsule 5-celled, sparsely hairy.

Accepted Name:
Oxalis stricta L.
Publication: Sp. Pl. 1: 435. 1753.

Synonyms & Misapplications:
Oxalis ambigua Jacq.
Oxalis bushii Small
Oxalis coloradensis Rydb.
Oxalis cymosa Small
Oxalis europaea Jord.
Oxalis fontana Bunge
Oxalis interior (Small) Fedde
Oxalis rufa Small
Additional Resources:

PNW Herbaria: Specimen records of Oxalis stricta in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Oxalis stricta checklist entry.

E-Flora BC: Oxalis stricta atlas page.

CalPhotos: Oxalis stricta photos.

USDA Plants: Oxalis stricta information.

8 photographs:
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