Regrettably, Andropogon × velutinus Norrmann & Nagahama in Nagahama et al. (2012) was not validly published because the existence of a homonymous was overlooked (cf. Articles 53.1 and 53.2, McNeill et al., 2012). Hooker (1896:194) proposed the name Andropogon velutinus Hook. f., a basionym for Chrysopogon velutinus (Hook. f.) Bor (1960: 119). The epithet paraguariensis is available to be used within Andropogon, and herein this oversight is emended.
Andropogon ×paraguariensis Norrmann & Nagahama, nom. nov.
Andropogon × velutinus Norrmann & Nagahama, Darwiniana 50(1): 117. 2012, non Hook. f. (1896). TYPE: Paraguay, Depto. Concepción, 38 km E de Concepción por ruta 5, 20-IV-1995, G. A. Norrmann 219 (holotype CORD!; isotype CTES!).
Andropogon × paraguariensis belongs to the Andropogon lateralis complex. It grows in Paraguay, west-central and southeastern Brazil, forming small but dense populations in confined sympatric areas –swamps– among populations of the parental species (A. bicornis L. and A. glaziovii Hack.; Nagahama et al., 2012). This species is distinguished by its main axis of the synflorescence with 37-71 branches; first branch on the main axis of synflorescence with 34-49 branches; second branch on the main axis of synflorescence with 8-10 internodes; articulate rachis internodes 1.9-3 mm long, with hairs 5.3-8.2 mm long; pedicel 1.6-2.8 × 0.1-0.2 mm, with hairs 5.3-8.2 mm long; and pedicellate spikelet 0.5-1 × 0.05 mm. The epithet refers to the Paraguay River, which runs through the region where the type specimen was collected.
A detailed description, examined materials and illustrations of the taxon are presented in Nagahama et al. (2012).
ACKNOWLEDGMENTS
We thank Kanchi N. Gandhi (HUH) for bringing this omission to our attention and two anonymous reviewers for their constructive suggestions that greatly improved the manuscript. This work was supported by CONICET (PIP 112-200801-01557 and Doctoral fellowship), SECyT-UNC and SGCyT-UNNE.
