Boyko, El’vira V., and Elena V. Novozhilova. “Structure of the Cypselas of Gaillardia Aristata and G. Pulchella (Asteraceae: Helenieae)”. Turczaninowia 23, no. 3 (October 1, 2020): 12-21. Accessed August 12, 2025. https://turczaninowia.asu.ru/article/view/8544.