Wei, Y.-G. et al. 2010. LITOSTIGMA, A NEW GENUS FROM CHINA: A MORPHOLOGICAL LINK BETWEEN BASAL AND DERIVED DIDYMOCARPOID GESNERIACEAE. Edinburgh Journal of Botany. 67, 1 (Feb. 2010), 161–184. DOI:https://doi.org/10.1017/S0960428609990291.