On the taxonomic position of Panicum scabridum (Poaceae, Panicoideae, Paspaleae).

A. SCATAGLINI; ALISCIONI, S. S.; F.O. ZULOAGA

Phytotaxa

magnolia press

Año: 2013 vol. 163 p. 1 - 15

1179-3155

Panicum scabridum, an incertae sedis species of Panicum s.l., is here included in the genus Coleataenia, following aphylogenetic analysis based on one new ndhF sequence of the species and associated morphological data. Panicumscabridum and species of Coleataenia are cespitose and perennial plants, with a lower glume (1?)3?5-nerved, 1/3 to 3/4of the spikelet, upper glume and lower lemma 5?9-nerved, and upper anthecium smooth, shiny, and indurate. WithinColeataenia, P. scabridum appeared as the sister taxon of the species pair C. prionitis and C. petersonii; these threespecies are the only NADP-me taxa of tribe Paspaleae exhibiting two bundle sheaths around the vascular bundles, i.e.,with an outer parenchymatous sheath and an inner mestome sheath with specialized chloroplasts. The new combinationColeataenia scabrida is proposed and a lectotype is designated.