Phylogeny of sections Clavelligerae and Pectinatae of Panicum (Poaceae, Panicoideae, Paniceae).

F.O. ZULOAGA; SALOMON, LUCIANA; A. SCATAGLINI

PLANT SYSTEMATICS AND EVOLUTION

SPRINGER WIEN

Lugar: Viena; Año: 2015 vol. 301 p. 1693 - 1711

0378-2697

Taxonomic features of African species ofPanicum sections Clavelligerae and Pectinatae arereviewed and compared with Dichanthelium and other taxain tribe Paniceae. The new subtribe Dichantheliinae isproposed on the basis of molecular and morphologicalcharacters: it includes non-Kranz species, growing at forestsedges or in mountain grasslands with membranousciliateligules, lax and open inflorescences, ellipsoid tooblongoid spikelets, and an indurate upper anthecium.Within the Dichantheliinae, the new genus Adenochloa isalso established on the basis of chloroplast ndhF sequencesand morphological characters, i.e., plants with clavellatemulticellular, and glandular hairs present on blades, mainaxis, branches, and pedicels of inflorescences; ellipsoid tooblongoid, glabrous spikelets, with a lower glume 1/3 tomore than 1/2 the length of the spikelet; a 7?13-nervedupper glume and a 5?9-nerved lower lemma; the upperanthecium is indurate, pilose or glabrous. Adenochloaincludes 14 species from Africa and Madagascar. The newcombinations: Adenochloa adenophylla, A. adenophora, A.bullockii, A. claytonii, A. ecklonii, A. flacciflora, A. habrothrix,A. hymeniochila, A. lukwangulense, A. nigromarginata,A. pectinella, A. pole-evansii, A. sadinii, andA. squarrosa are proposed and the new genus is comparedwith other genera of the tribe Paniceae. Also, lectotypes aredesignated for Brachiaria sadinii, Panicum adenophorum,P. adenophyllum, P. ecklonii, P. katentaniense, P. kisantuense,P. hymeniochilum, P. hymeniochilum varglandulosum, P. snowdenii, and P. scandens; Panicumglanduliferum and P. omega are treated as new synonymsof Adenochloa hymeniochila and A. pectinella, respectively.Finally, new illustrations are provided for 6 speciesof the new genus.