Wahlenbergia expansa Wahlenbergia homallanthina Wahlenbergia homallanthina var. angustifolia Astrocodon expansus Astrocodon kruhseanus Campanopsis homallanthina Campanula homallanthina Campanula kruhseana Campanula redowskiana Platycodon homallanthinus Platycodon homallanthinus var. angustifolius Platycodon homallanthina var. angustifolium
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024