Amphicarpaea Elliott ex Nuttall.
A genus of 4-5 species, of e. and se. Asia and North America; a species previously included in Amphicarpaea from montane Africa was removed to a monotypic genus by Ohashi & Ohashi (2018). It now appears that 3 (or more?) semi-cryptic taxa should be recognized in what has traditionally been considered a single species of Amphicarpaea (Kartzinel et al. 2016; Callahan 1997; Parker 1996). The genus name has been corrected to Amphicarpaea from the frequently used Amphicarpa.
ID notes:Producing inflorescences of two types, one with chasmogamous flowers and aerial legumes, the other with cleistogamous flowers and subterranean legumes.
Ref: Callahan (1997); Isely (1998); Kartzinel et al. (2016); Kartzinel et al. (2016); Ohashi & Ohashi (2018); Ohashi & Ohashi (2018); Parker (1996); Parker, Doyle, & Doyle (2004). Show full citations.