Goyder (2006: 32) proposed Matelea chacoensis Goyder as a replacement name for the illegitimate Gonolobus hirtus Griseb. (Grisebach 1879: 234), a later homonym of G. hirtus (L.) R. Br. ex Schultes (1820: 64). The name was adopted in the recent Southern Cone and Bolivian Checklists (Ezcurra et al. 2008: 1116; Fuentes & Morales 2014: 244). However, Pseudibatia hirta Malme (1905: 14), which may be considered a legitimate replacement name (McNeill et al. 2012: Art. 58.1), was included in synonymy (as P. hirta (Griseb.) Malme). The epithet is available in Matelea and takes priority over M. chacoensis — the formal combination is made below.

Matelea hirta (Malme) Goyder, comb. nov.

http://www.ipni.org/urn:lsid:ipni.org:names:77152988-1

Basionym: Pseudibatia hirta Malme, Arkiv Bot. 4 (14): 14 (1905). Based on Gonolobus hirtus Griseb. (Grisebach 1879: 234), non G. hirtus (L.) R. Br. ex Schultes (1820: 64). Type: Argentina, Salta, “ad fl. Juramento”, Feb. 1873, Lorentz & Hieronymus 316 (holotype GOET; isotype LIL).

Synonym: Matelea chacoensis Goyder (2006: 32), nom. superfl.