Molecular phylogenetic analysis places a strongly monophyletic Clarkia as sister to Gayophytum and Chylismiella (R. A. Levin et al. 2004). All but one species
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Bischofiaceae, but embryological and anatomical data (A. K. Bhatnagar and R. N. Kapil 1973; G. A. Levin 1986b; A. M. W. Mennega 1987; G. L. Webster 1994) argue
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Gregory (1972[1973]) into a single subsection based on recent molecular studies by G. D. Hoggard et al. (2004) and R. A. Levin et al. (2004). The two groups
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desert flats inland from 0–2500 m. R. A. Levin et al. (2004) found strong molecular support for Camissoniopsis in a clade with Neoholmgrenia and Tetrapteron
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(1969) in the delimitation of Camissonia based on the molecular analysis (R. A. Levin et al. 2004); they recognized eight genera in addition to the much reduced
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region where A. montanum is absent. Sterile hybrids with A. pinnatifidum (A. × gravesii), A. montanum (A. × wherryi D. M. Smith et al.), and A. platyneuron
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the sinus. Molecular data (R. A. Levin et al. 2004) placed C. xantiana close to C. bottae, and both of them close to but not within sect. Phaeostoma. Both
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1965; S. R. Seavey 1992). Unexpectedly, molecular analyses (D. A. Baum et al. 1994; R. A. Levin et al. 2004) placed sect. Epilobiopsis as sister to a clade
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1982b; R. H. Eyde 1977, 1979, 1981, 1982; R. C. Keating 1982), as well as several published and unpublished revisions of sections. These data provide a rich
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annual species as the genus Tetrapteron. R. A. Levin et al. (2004) found strong molecular support for Taraxia on a weakly supported branch sister to Clarkia
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species). Molecular analyses (D. A. Baum et al. 1994; R. A. Levin et al. 2004) provided strong support for Chamaenerion as a monophyletic group separate from
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section (five species). R. A. Levin et al. (2004), using both ITS and trnL-F sequence data, found very strong support for both a sparsely sampled sect.
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ovary; however, it is clear from molecular evidence (R. A. Levin et al. 2004; W. L. Wagner et al. 2007) that the perennial species with this feature (Taraxia)
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America. Species 2 (2 in the flora). R. A. Levin et al. (2004) found strong molecular support for Neoholmgrenia in a clade with Camissoniopsis and Tetrapteron
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because molecular data (R. A. Levin et al. 2004) failed to place these two groups in a single clade. Instead, Oenothera linifolia forms a very weakly supported
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sharply reflexed at maturity. R. A. Levin et al. (2004) included E. californicus and E. crassifolius (Greene) W. L. Wagner & Hoch (a species of Baja California
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Kleinia is included within a strongly supported clade with members of sect. Anogra in recent molecular studies (R. A. Levin et al. 2004; M. E. K. Evans
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treating variation in the group at the varietal level is followed here. R. A. Levin (2002) did not recognized any varieties. None. None. window.propertie
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Gregory (1972[1973]). In molecular phylogenetic (G. D. Hoggard et al. 2004; R. A. Levin et al. 2004) analyses, O. arida did not group with O. boquillensis, the
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(San Diego County; G. A. Levin 1986). Before being extirpated by a development project, the single population was re-established in a nearby protected site
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