Cynanchum neoleucanthum (Apocynaceae), a replacement name for the later illegitimate homonym Cynanchum leucanthum (K. Schum.) K. Schum Author Zhang, Cai-Fei CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China. & Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan 430074, China. Author Onjalalaina, Uy. E. Author Liao, Miao CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China. & Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan 430074, China. Author Hu, Guang-Wan CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China. & Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan 430074, China. text Phytotaxa 2023 2023-05-17 597 4 297 298 http://dx.doi.org/10.11646/phytotaxa.597.4.5 journal article 53335 10.11646/phytotaxa.597.4.5 7f3b33f1-a8ca-450d-a2e4-bd41d2d29233 1179-3163 7958710 Cynanchum neoleucanthum subsp. elongatum (Liede) Cai F. Zhang, G.W. Hu & Q.F. Wang , comb. nov. Basionym: Cynanchum leucanthum subsp. elongatum Liede (1993: 445) . TYPE:— MADAGASCAR . Antsiranana , Massif de Marivorahona au Sud-Ouest de Manambato (haute Mahavavy du Nord , district d’Ambilobé), 1750 m , 18–26 Mar. 1951 (fl.), H. Humbert & R. Capuron 25670 ( holotype , P [ P00057353 ]; isotypes , P [ P00442682 , P00057354 ]) .