Sierra Nevada Wildflower

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Spring Seep Mimulus, Mimulus guttatus, photographed near near Kernville, California.

Image: Biosparite, June 2008 [larger view].

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Over on Telliamed Revisited, Richard Lenski is talking about his favorite examples of evolution, and mentioned this figure from a paper on hybrid monkeyflowers.
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How do different varieties become species? Darwin credited selection. What are the details of this process? Speciation is a booming topic in the science literature, with 25,000 titles last year. Need to define a species to begin.
Today we took the children to Table Mountain, a volcanic mesa in northern California.