(Boraginaceae), a distinctive new taxon of series .

In the process of studying the species and its varieties, we discovered a unique taxon of the genus that resembles but differs in having a mostly densely white-strigose stem vestiture (sometimes with spreading trichomes) and tuberculate to muricate nutlets with often whitish tubercles that are, in comparison with typical , larger, with a wider base and more pointed apex, and more densely spaced. We believe this form to be different enough to describe as a new species, . This new species occurs in southwestern North America: in California and Arizona of the United States and in northern Baja California, Mexico.