V. Ambika, Jose Sojan, & V. Suresh. (2021). Pentatropis R.Br. ex Wight & Arn. (Apocynaceae), a new generic record for Kerala, India. Journal of Threatened Taxa, 13(14), 20292–20294. https://doi.org/10.11609/jott.7061.13.14.20292-20294 (Original work published December 26, 2021)