there can be every intermediate stage.” Lenz, L. W. 1958. A revision of the Pacific Coast irises. Aliso 4: 1–72. Lenz, L. W. 1959. Hybridization and speciation
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Californicae,” and Clarkson in a later treatment (1958) created a new subsection, the Oregonae, for it. L. W. Lenz (1959b) moved this species into subsect. Evansia
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desert vegetation. Publ. Carnegie Inst. Wash. 590: 215--306. Axelrod, D. I. 1958. Evolution of the Madro-Tertiary Geoflora. Bot. Rev. (Lancaster) 24: 433--509
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