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Oxalis oregana , known as redwood sorrel or Oregon oxalis, is a species of the wood sorrel family, Oxalidaceae, in the genus Oxalis native to moist Douglas-fir and coast redwood forests of western North America from southwestern British Columbia to Washington, Oregon, and California.[1][2]

Oxalis oregana
Redwood sorrel
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Oxalidales
Family: Oxalidaceae
Genus: Oxalis
Species:
O. oregana
Binomial name
Oxalis oregana
Nutt.

Description


Flowers occur singly; the sepal length is 5–10 mm and that of the petal is 13–20 mm.
Flowers occur singly; the sepal length is 5–10 mm and that of the petal is 13–20 mm.

Oxalis oregana is a short, herbaceous perennial with erect flowering stems 5–15 cm tall. The three leaflets are heart-shaped, 1–4.5 cm long with purplish undersides, on 5–20 cm stalks. The inflorescence is 2.4–4 cm in diameter, white to pink with five petals and sepals. The hairy five-chambered seed capsules are egg-shaped, 7–9 mm long; seeds are almond-shaped.[3] It spreads by a scaly rhizome varying the size of patches they can be seen in throughout moist forest under canopies.[4]


Rapid light response


Oxalis oregana photosynthesizes at relatively low levels of ambient sunlight (1/200th of full sunlight). When direct sunlight strikes the leaves they fold downwards; when shade returns, the leaves reopen. Taking only a few minutes, this movement is observable to the eye.[5][6]


As food


The leaves of Oxalis oregana were eaten by the Cowlitz, Quileute and Quinault peoples. Like spinach, they contain mildly toxic oxalic acid, which is named after the genus.[7] They are safe to eat in small amounts for those with no oxalate-related conditions.[8]

Patch of Oxalis oregana. Size can varying dependent on rhizome development.
Patch of Oxalis oregana. Size can varying dependent on rhizome development.

References


  1. "WTU Herbarium Image Collection". Burke Museum. Retrieved 2016-05-02.
  2. "Plants Profile for Oxalis oregana (redwood-sorrel)". plants.usda.gov. Retrieved 2016-05-02.
  3. "Nyctinasty and Mimosa leaf movement". Science and Plants for Schools. Retrieved 2016-05-02.
  4. "Burke Herbarium Image Collection". biology.burke.washington.edu. Retrieved 2021-05-01.
  5. "Oxalis oregana". Electronic Atlas of the Plants of British Columbia. Retrieved 2016-05-02.
  6. "12.1.1 Light interception and utilisation". Plants in Action. Archived from the original on 2016-03-19. Retrieved 2016-05-02.
  7. Pojar, Jim; Andy MacKinnon (2004). Plants Of The Pacific Northwest Coast: Washington, Oregon, British Columbia & Alaska. Lone Pine Publishing. ISBN 978-1-55105-530-5.
  8. Benoliel, Doug (2011). Northwest Foraging: The Classic Guide to Edible Plants of the Pacific Northwest (Rev. and updated ed.). Seattle, WA: Skipstone. p. 175. ISBN 978-1-59485-366-1. OCLC 668195076.


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