Amaranthus hypochondriacus var. macrostachys Moquin-Tandon (1849: 256)

Iamonico, Duilio, 2016, Nomenclature survey of the genus Amaranthus (Amaranthaceae). 5. Moquin-Tandon’s names, Phytotaxa 273 (2), pp. 81-114 : 98

20. Amaranthus hypochondriacus var. macrostachys Moquin-Tandon (1849: 256)

Type (lectotype here designated):— FRANCE. Herb. Paris, 1811, s. coll . s.n. (P 04021952 [digital image!], image of the lectotype is available at http://mediaphoto.mnhn.fr/media/1449489984535fBBH3VeG09vLqkUn).

= Amaranthus hypochondriacus Linnaeus (1753: 991) .

Type (lectotype designated by Townsend 1985: 25):— U.S.A. Habitat in Virginia, Herb. Linn. No. 1117.24 (LINN [digital image!], image of the lectotype is available at http://linnean-online.org/11650/).

Nomenclatural notes:—A short diagnosis was provided for this variety (“spici omnibus longissimis crassis approximatis rigidis densifloris purpureo-viridibus”), plus the citation “ Amaranthus macrostachyus Merat ! in herb.”, which should be referred to a syntype (Art. 9,5 of the ICN). There is one specimen at P (barcode 04021952) collected in “Hort. Paris.” in 1811, as reported in the label on the bottom-right (the first two lines of the label cite: “ Amaranthus macrostachyus Merat. | in herb. ”). The plant beared on the sheet (a terminal part) shows morphological characteristics matching with the diagnosis of the var. macrostachys . The P 04021952 is here designated as the lectotype of the name Amaranthus hypochondriacus var. macrostachys .

Taxonomical notes:—Morphological features of the lectotype, especially concerning the synflorescence structure (panicle-like and 1.5‒2.5 cm wide), allow to identify it as Am. hypochondriacus and to propose a synonymization with Am. hypochondriacus s.str. according to the current concept ( Mosyakin & Robertson 2003, Iamonico 2015).