Romanoa, Trevis., Sagg. Algh. Coccot.

Cardinal-McTeague, Warren M. & Gillespie, Lynn J., 2020, A Revised Sectional Classification of Plukenetia L. (Euphorbiaceae, Acalyphoideae) with Four New Species from South America, Systematic Botany (Basel, Switzerland) 45 (3), pp. 507-536 : 533

ROMANOA Trevis., Sagg. Algh. Coccot. 99. 1848.

Anabaena A.Juss., Euphorb. Gen. 46, 1824, nom. rej., non. Bory ex Bornet & Flahault 1888.

Sajorium sect. Anabaena (A.Juss.) Baill., Étud. Euphorb. 484. 1858.

Plukenetia sect. Anabaena (A.Juss.) Müll.Arg., Linnaea 34: 158. 1865.

Anabaenella Pax & K.Hoffm. in A.Engler (ed.), Pflanzenr. IV, 147, IX (Heft 68): 27. 1919, nom. illeg.

TYPE: Anabaena tamnoides A.Juss. [= Romanoa tamnoides (A.Juss.) Radcl. -Sm.]

Taxonomic Discussion —The genus Romanoa Trev. 1848 is the earliest published replacement name for Anabaena A.Juss. 1824 , nom. rej., after the well-known genus of cyanobacteria, Anabaena Bory ex Bornet & Flahault 1888 , was conserved. The replacement name Anabaenella Pax & K.Hoffm. 1919 was used for much of the 20th century until the lesser-known Romanoa was re-discovered by Punt (1962) and nomenclaturally corrected by Radcliffe-Smith (1980). Romanoa was briefly treated as a synonym of Plukenetia , first as Sajorium sect. Anabaena ( Baillon 1858) then Plukenetia sect. Anabaena ( Müller 1865) , but has often been regarded as a separate genus for having plesiomorphic 3-carpellate ovaries, compared to 4- carpellate in Plukenetia . Pollen morphology further supported the recognition of Romanoa ( Gillespie 1994) and molecular phylogeny suggests they are distinct and form sister genera ( Cardinal-McTeague and Gillespie 2016).