Microseris campestris

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The tetraploid Microseris campestris is morphologically intermediate between M. elegans and M. douglasii, and the molecular data of D. Roelofs et al. (1997) show a particularly close relationship with the former species. It is known only from the San Joaquin Valley and surrounding foothills. Diploid plants assignable to M. douglasii but with fruit morphology similar to M. campestris, found much closer to the coast near San Luis Obispo, are thought to be the result of introgression between M. douglasii and M. bigelovii (K. L. Chambers 1955).