"Myrtales" . "Plantae" . . . . "Magnoliophyta" . . . . . . . "Magnoliopsida" . . . . . . "Kern River Clarkia" . . "F.H. Lewis and Vasek" . "Onagraceae" . "Clarkia exilis F.H. Lewis and Vasek" . "Clarkia exilis" . "Clarkia" . .