Abstract
Subfam. Betoideae (Amaranthaceae Juss./Chenopodiaceae Vent. sensu APGIV) is a monophyletic group which comprises five genera (Aphanisma, Beta, Hablitzia, Oreoblitum, and Patellifolia) and an undefined number of species (11‒16 according to the available literature). While the taxonomic position of the various groups in Betoideae is quite well studied and clarified, nomenclature is still poorly investigated and several names remain to be untypified. The present research has the aim to present a comprehensive view of all taxa (at all ranks) beloning to Betoideae by a list of their accepted names, main synonyms, and types. Taxonomic considerations were also made. The names Aphanisma blitoides, Beta patula, Beta lomatogona, Beta macrorhiza, Beta nana, Beta macrocarpa, Beta bourgaei (= Beta macrocarpa), Oreobliton thesioides, and Beta procumbens are typified on specimens deposited respectively at K (lecto-), BM (lecto-), LE (lecto-), H (lecto-), K (neo-, isoneotypes a FI, GOET, K, WAG), PAL (neo-), G (lecto-, isolectoypes a G, K), P, and C (neo-). The typification of the name Hablitzia tamnoides by Menitsky was discussed and accepted. A new nomenclature change [Beta sect. Corollinae subsect. Nanae (Ulbr.) Iamonico, comb. et stat. nov.] and two new taxa (Beta sect. Beta subsect. Patulae Iamonico, subsect. nov., and Beta sect. Macrocarpae Iamonico, sect. nov.) were proposed. A new classification of Subfam. Betoideae was proposed, including 2 tribes (Beteae, and Hablitzieae), 5 genera (Aphanisma, Beta, Hablitzia, Oreoblitum, and Patellifolia), and for the genus Beta 3 sections and 4 subsections (sect. Beta subsect. Beta, Beta sect. Beta subsect. Patulae Iamonico subsect. nov., sect. Corollinae subsect. Corollinae, sect. Corollinae subsect. nanae (Ulbr.) Iamonico comb. et stat. nov., Beta sect. Macrocarpae Iamonico sect. nov.).