A New Combination for a Narrowly Endemic Polemonium (Polemoniaceae)

Based on recent molecular work, Polemonium occidentale Greene subsp. lacustre Wherry (Polemoniaceae) is elevated to species rank as P. lacustre (Wherry) J. P. Rose & Sytsma. Key morphological distinctions between this and other species of the clade to which it belongs are summarized.