Abstract
Phacelia filiae N. D. Atwood, F. J. Smith & T. A. Knight is an undescribed species from Clark, Nye, and Lincoln Counties, Nevada. It is closely related to Phacelia parishii of California, Arizona, and Nevada and Phacelia beatleyae of southern Nevada. Phacelia petrosa N. D. Atwood, F. J. Smith & T. A. Knight from Arizona, Nevada, and Utah is also described as new. It is most closely related to Phacelia crenulata, which is known from Arizona, California, Nevada, and Utah. The most prominent differences among these species are the shape of the seeds and appearance of the seed coats.
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