; Sp. Pl. 2: 933 (1753)
Distribution: cosmopolitan, but chiefly temp. regions. Systematics and synonymy see Marcussen et al. 2022. There remain many undescribed species in the Andes. Also, many synonymized species in sect. Borealiamericanae (Appalachians) deserve resurrection (H. E. Ballard).
= Chrysion Spach; Hist. Nat. Vég. 5: 509 (1836)
= Cittaronium Rchb.; Deut. Bot. Herb.-Buch: 186 (1841)
= Crocion Nieuwl.; Amer. Midl. Naturalist 3: 214 (1914)
= Dischidium Rchb.; Handb. Nat. Pfl.-Syst.: 269 (1837)
= Erpetion DC. ex Sweet; Brit. Fl. Gard. 2: t. 170 (1826)
= Grammeionium Rchb.; Consp. Regn. Veg.: 188 (1828)
= Ion Medik.; Malvenfam.: 102 (1787)
= Jacea Opiz; Bercht. & Opiz, Oekon.-Techn. Fl. Böhm. 2(2): 8 (1839)
= Lophion Spach; Hist. Nat. Vég. 5: 516 (1836)
= Mnemion Spach; Hist. Nat. Vég. 5: 510 (1836)
= Oionychion Nieuwl.; Amer. Midl. Naturalist 3: 210 (1914)