Potentilla douglasii var. capitata Potentilla douglasii var. brownii Potentilla douglasii var. douglasii Potentilla douglasii var. filicoides Potentilla douglasii var. parviflora Potentilla douglasii var. pseudocapitata Potentilla douglasii var. tenella
Horkelia fusca Horkelia fusca subsp. typica
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024