Natural distribution of Derris longiracemosa (white symbols) and D. solorioides (black symbols) in southwestern Thailand. The bright orange areas on the map indicate the distribution of limestone karsts in Thailand. The right panel shows a magnified view of the southwestern region, highlighting the localities where the specimens were collected.

 
 
  Part of: Boonprajan P, Oncham S, Sirichamorn Y (2025) Derris longiracemosa (Fabaceae), a new species from Thailand with extraordinary limestone adaptations and the longest inflorescences ever recorded. PhytoKeys 261: 13-32. https://doi.org/10.3897/phytokeys.261.156249