Polemonium pulcherrimum subsp. pulcherrimum Polemonium pulcherrimum var. delicatum Polemonium pulcherrimum subsp. lindleyi Polemonium pulcherrimum var. shastense
Polemonium humile f. pulcherrimum Polemonium caeruleum var. pulcherrimum
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024