|Oxalis oregana subsp. var.||Redwood Sorrel|
Redwood Sorrel or Oregon Oxalis (Oxalis oregana) is a species of the wood sorrel family, Oxalidaceae, native to moist Douglas-fir and Coast Redwood forests of western North America from southwestern British Columbia, Washington, Oregon, and California.
It is a short herbaceous perennial plant 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.
Redwood sorrel photosynthesises at relatively low levels of ambient light (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.
|Standard Cyclopedia of Horticulture|
Oxalis oregana, Nutt. Low: lfts. broadly obcordate, 1-2 in. wide: fls. white or rosy, yellowish at base, deeper veined. N. W. coast.
Pests and diseases
- ↑ Burke Museum — WTU Herbarium Image Collection
- ↑ Plant Profile for Oxalis oregana — USDA Plant Database
- ↑ SAPS — Science And Plants for Schools
- ↑ E-Flora BC — Electronic Atlas of the Plants of British Columbia
- ↑ Pojar, Jim; Andy MacKinnon (2004). Plants Of The Pacific Northwest Coast: Washington, Oregon, British Columbia & Alaska. Lone Pine Publishing. ISBN 978-1551055305.
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963