Machaeranthera aquifolia Machaeranthera pattersonii var. pattersonii Machaeranthera aspera Machaeranthera aquifolia Aster rubrotinctus Machaeranthera viscosula Machaeranthera rubricaulis Machaeranthera bigelovii var. bigelovii Machaeranthera pattersonii var. hallii Machaeranthera canescens var. alpina Aster pattersonii Machaeranthera spectabilis Aster townshendii Aster aquifolius Machaeranthera centaureoides Machaeranthera varians
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024