Chapter 7: Linnaean Plant Names and their Types (part G) Author Jarvis, Charlie Department of Botany, Natural History Museum, Cromwell Road, London, UK text 2007 Linnaean Society of London in association with the Natural History Museum London Order out of Chaos. Linnaean Plant Types and their Types 529 556 book chapter https://doi.org/10.5281/zenodo.291971 978-0-9506207-7-0 291971 Gomphrena polygonoides Linnaeus , Species Plantarum 1 : 225. 1753 . "Habitat in America meridionali." RCN: 1682. Basionym of: Illecebrum polygonoides (L.) L. (1762) . Type not designated. Original material: [icon] in Hermann, Parad. Bat.: 17. 1698; [icon] in Sloane, Voy. Jamaica 1: 141, t. 86, f. 2. 1707. Current name: Alternanthera sessilis (L.) DC. ( Amaranthaceae ). Note: This name had frequently been rejected as a nomen dubium (e.g. by Pedersen in Darwiniana 17: 438. 1967 and Mears & Gillis in J. Arnold Arbor. 58: 62. 1977) before Mears (in Taxon 29: 91. 1980) attempted to dispose of the name by typifying it using material in Herb. Sloane 2: 106 ( BM-SL ) , which he stated would make it a synonym of Alternanthera sessilis (L.) DC. However, his chosen type is not the material from which Sloane's t. 86, f. 2 (which was cited by Linnaeus) was prepared, which is identifiable as A. paronychioides A. St. -Hil. Although Mears' intention was laudable, a neotype cannot be designated when original material exists (Art. 9.11). It appears that formal rejection of the name may be necessary.