Nolina wolfii Nolina bigelovii subsp. parryi Nolina bigelovii var. parryi Nolina bigelovii var. wolfii Nolina parryi subsp. wolfii Nolina parryi subsp. parryi Nolina bigelovii subsp. wolfii
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024