Symphyotrichum spathulatum var. intermedium Symphyotrichum spathulatum var. spathulatum Symphyotrichum spathulatum var. yosemitanum
Aster spathulatus Aster fremontii f. fremontii Aster fremontii var. fremontii Aster occidentalis subsp. occidentalis Aster aestivus Aster fremontii Aster occidentalis var. scabriusculus Aster spathulatus var. spathulatus Aster occidentalis var. delectabilis Aster occidentalis var. occidentalis Aster occidentalis var. typicus Aster occidentalis var. parishii Aster aestivus var. aestivus Aster occidentalis
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024