Amaranthus standleyanus Parodi ex Covas

Raus, Thomas, 2022, Taxonomic, nomenclatural and floristic review of Amaranthaceae of Greece and neighbouring countries, Willdenowia 52 (3), pp. 335-357 : 347-348

22. Amaranthus standleyanus Parodi ex Covas in Darwiniana 5: 339. 1941. – Holotype: South America, Argentina, Tucumán, Amaicha , 2 Feb 1933, Parodi 11040 (F F685296 ).

= Amaranthus vulgatissimus Thell. in Ascherson & Graebner, Syn. Mitteleur. Fl. 5 (1. Abt.): 343. 1914, nom illeg. [non A. vulgatissimus Speg. in Anal. Mus. Nac. Buenos Aires 7: 135. 1902]. – Holotype: South America, Argentina, Salta, Metán, Spegazzini 167 (Z Z000000249).

Remarks — Amaranthus standleyanus resembles A. crispus with respect to the number of perianth segments, (4 or)5, and the indehiscent fruit, but differs on its smooth, entire leaf margins (vs undulate-crenate in A. crispus ) and the perianth segments being reflexed in fruit (vs connivent in A. crispus ). Native to Argentina, Bolivia, Paraguay and Uruguay ( Pedersen 1999: 25; Bayón 2015: 359), it was erroneously reported as naturalized in Turkey-in-Europe ( Greuter & al. 1984: 47) but there is no floristic basis for this, corroborated by herbarium material. Accordingly, the record for European Turkey has to be removed from the Euro+Med PlantBase ( Iamonico 2015a).