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Background  Southeast Asia, together with tropical Africa, Madagascar, South India and Sri Lanka, and the eastern Himalayas, are the five primary hotspots of species diversity of  Impatiens  (Balsaminaceae). China is also rich in  Impatiens  species, especially in the limestone karsts or ‘Danxia’ landforms. With zygomorphic flowers and diverse corolla morphology and color, the species in  Impatiens  are well-known for their ornamental use, but they are also notorious in taxonomy. During the preparation of revision of  Impatiens  in Zhejiang and adjacent regions, an unknown species was collected from Mt. Wuyi in Fujian Province, Southeast China.    Results  Phylogenetic analyses based on nuclear ITS, chloroplast  atp B- rbc L and  trn L-F sequences, together with micromorphology of pollen grains and seed coats, strongly supported the close relationship of the new species with  Impatiens platysepala  Y.L.Chen and  I. chloroxantha  Y.L.Chen. In turn, both molecular data and morphological characters also were sufficient to distinguish the new species from the other two counterparts.    Conclusions  Our detailed morphological observations and molecular phylogenetic analyses support the recognition of  Impatiens wuyiensis  as a species new to science.

Impatiens wuyiensis (Balsaminaceae), a new species from Fujian of Southeast China, based on morphological and molecular evidences