title: Larsenianthus, a new Asian genus of Gingers (Zingiberaceae) with four species.
abstract: Larsenianthus W. J. Kress & Mood, gen. nov. is described with one new combination and three new species. Larsenianthus careyanus (Benth.) W. J. Kress & Mood, comb. nov., is widespread in India and present-day Bangladesh; Larsenianthus wardianus W. J. Kress, Thet Htun & Bordelon, sp. nov., is from upper Myanmar in Kachin State; Larsenianthus assamensis S. Dey, Mood, & S. Choudhury, sp. nov., is restricted to Assam, India; and Larsenianthus arunachalensis M. Sabu, Sanoj & T.Rajesh Kumar, sp. nov., has only been found in Arunachal Pradesh, India. A phylogenetic analysis using the plastid trnK intron and nuclear ITS DNA sequence data indicates that the four species of Larsenianthus form a monophyletic lineage that is sister to Hedychium, a geographically widespread genus of about 50 species in tribe Zingibereae of subfamily Zingiberoideae. A dichotomous key and three-locus DNA barcodes are provided as aids for the identification of the four species of Larsenianthus.
authors.affiliation: Department of Botany, MRC-166, National Museum of Natural History, Smithsonian Institution, P.O. Box 37012, Washington, DC 20013-7012 U.S.A.
authors.forename: W John
authors.initials: WJ
authors.lastname: Kress
authors.forename: John
authors.initials: J
authors.lastname: D Mood
authors.forename: Mamiyil
authors.initials: M
authors.lastname: Sabu
authors.forename: Linda M
authors.initials: LM
authors.lastname: Prince
authors.forename: Santanu
authors.initials: S
authors.lastname: Dey
authors.forename: E
authors.initials: E
authors.lastname: Sanoj