Dichocarpum hagiangense—a new species and an updated checklist of Ranunculaceae in Vietnam
Minh Ty Nguyen,
Ngoc Bon Trinh,
Thanh Thi Viet Tran,
Tran Duc Thanh,
Long Ke Phan,
Van The Pham
Affiliations
Minh Ty Nguyen
Institute of Applied Technology, Thu Dau Mot University, Thu Dau Mot, Vietnam
Ngoc Bon Trinh
Department of Silviculture foundation and Forest Phytodiversity, Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Ha Noi City, Vietnam
Thanh Thi Viet Tran
Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
Tran Duc Thanh
Southern Center of Application for Forest Technology & Science, Forest Science Institute of South Vietnam, Thu Dau Mot, Vietnam
Long Ke Phan
Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
Van The Pham
Environmental Engineering and Management Research Group, Ton Duc Thang University, Ho Chi Minh, Vietnam
Dichocarpum hagiangense from Ha Giang province, northern Vietnam is described and illustrated. Diagnostic features of the new species are a short rhizomatous stem, (2–)3-foliolate or simple leaves, and pink-purple flowers. The described species is distinct from closely allied D. trifoliolatum in having longer sepals, shape and obcordate apex of petal limbs, shorter flower stem, number and tooth shape of basal leaves; it differs from D. basilare and D. carinatum in having stem leaf, retuse apex and longer of central leaflet, number and (2–)3-foliated (or simple) of leaf. With the support of molecular data, the new species was clearly distinguished from other species in the Dichocarpum group by eight autapomorphic characters in nrITS sequence. A key to all species of Dichocarpum is provided. We suggest the IUCN conservation status of D. hagiangense to be “Critically Endangered”. A newest checklist of the family Ranunculaceae in Vietnam is updated.
