The rediscovery of Ohwia luteola (Fabaceae, Papilionoideae) after 50 years and comparative analysis of Ohwia species in plastid genome sequence

<i>Ohwialuteola</i> (H. Ohashi & T. Nemoto) H. Ohashi is only known from one collection in Yunnan Province, China. It has not been recollected since its last collection in 1972. Here, we report the rediscovery of the species that means the first new record in Hunan Province, China. Based on fresh material, we present a revised morphological description of <i>O.luteola</i> and conducted sequencing and assembly of the plastid genome. Morphologically, <i>O.luteola</i> is similar to <i>O.caudata</i>, but the former can be easily distinguished by leaflets length/width ratio ranging from 2.5 to 3.6, leaflets apex acute (with an angle of 50°-80°), terminal inflorescences, wings distinctly auriculate at base and inner side indistinctly rugose, and hilum center not over 3/5 length of seed. Molecular phylogenetic analysis confirmed <i>O.luteola</i> is sister to <i>O.caudata</i>.