desert calico, Loeseliastrum matthewsii, Owens Valley on lower slopes of Sierra Nevada, elevation 1255 m (4115 ft). Most plants in this population showed unusual yellow flower coloration, often (as in this example) mixed with the more typical pink on the same plant, and even in the same flower. Note that all the new buds are yellow. And it had rained substantially the day before.
My working hypothesis: the younger, developing flowers are susceptible to differential leaching of pigments by rain water, removing the presumably more-soluble pink (anthocyanic) component(s), while those pigments have become more fixed in the older flowers. Other ideas??
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