Abstract:The anther of an endangered species, A mmopiptanthus nanus （M. Pop.） Cheng f., is tetrasporangiate. The anther wall is of basic type in the development, which comprises epidermis, fibrous endothecium, middle layer and glandular tapetum. The microspore mother cells undergo meiosis, and the cytokinesis is simultaneous. The tetrads are tetrahedral. Mature pollen grains are two-celled at the dispersal stage. The abnormal development is not found in microsporogenesis and in development of microgametophyte of the species. It is suggested that the endangerment of the species is not related to the microsporogenesis and microgametophyte development.