Aster cichoriacea Machaeranthera canescens subsp. glabra Machaeranthera canescens var. viridis Machaeranthera fremontii Aster linearis Aster canescens var. viridis Machaeranthera canescens var. glabra Machaeranthera linearis
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024