Ohashia, a new genus ofDerris‐like Millettioid legumes (Leguminosae, Papilionoideae) as revealed by molecular phylogenetic evidence

Abstract

AbstractDerrishas been one of the most complex genera in the Millettioid s.str. group. Phylogenetic studies have resulted in the transfer of some species intoAganopeandBrachypterumto ensure the monophyly ofDerriss.str. However, the Chinese endemic speciesDerris yunnanensiswas not included in these phylogenies. Compared to the other monophyletic genera of the Millettioid s.str. group, this species has received special attention due to its distinctive morphological characters. This paper aims to provide evidence that supports recognition ofD. yunnanensisas a separate monospecific genus based on morphology and molecular data including complete chloroplast genome and nuclear ITS/5.8S as well astrnK‐matK,trnL‐FIGS, andpsbA‐trnHIGS chloroplast DNA sequences.Derris yunnanensisis consistently recovered in a clade as sister to the genusAntheroporum. The species differs from the other genera of the Millettioid s.str. group by having a pseudoraceme with 6–10 flowers per brachyblast, abaxially puberulent standard, conspicuous calyx teeth with the upper 2 connate and the lowermost distinctly longer than the others, a yellowish‐brown puberulent pod having an adaxial suture with a 1–2 mm wide wing, and ovules 3–6 per ovary. Hence, a new genusOhashiais proposed here.