Materials and methodsSpecimens of the new species were collected in late June 2023 from Mount Kallar in Chaharmahal and Bakhtiari province. Specimens or high-resolution images of specimens of the genus Bufonia were compared with herbarium specimens at B, D, E, G, HSHU, JE, K, P, and TARI. Additionally, relevant literature (de Candolle 1824, Freyn 1903, Cullen 1966, Shishkin 1995, Rechinger 1988, Chrtek and Krisa 1999, Rostami Ghadi et al. 2023) was reviewed. The gross morphology of the new species was examined and measured under a stereo-binocular microscope. A total of 13 specimens of the new species, along with 25 flowers, were examined. Photographs of plant parts were taken at the herbarium with a Samsung Galaxy A20s phone and Canon EOS 850D camera. The conservation status was evaluated based on field observations following IUCN (2022) guidelines. This material has been deposited in the D herbarium. Herbarium codes are according to Thiers (2024).