Day 171: Shy little Oxalis oregana (Redwood Sorrel) is common in the Pacific Northwest and often occurs fairly densely where it receives shade from Douglas-fir. Its three-lobed leaves resemble those of clover, although on a grand scale, and they are highly sensitive to light levels. When the sun breaks through the forest canopy, the leaves will fold downward in a matter of minutes, opening again when shade returns. The flowers may be white to pink, and may be marked with darker purple "nectar guides." Pollination is performed largely by syrphid flies. All parts of the plant contain oxalic acid and should not be eaten.
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