Udayan, P.S. and Balachandran, I. 2015. Cleistanthus sankunnianus Sivar. & Indu Balach. a Rare and Little Known Endemic Plant Rediscovered from Wild Populations in Kollam District of Kerala State, India. Nelumbo. 48, 1-4 (Jul. 2015), 217–218. DOI:https://doi.org/10.20324/nelumbo/v48/2006/74103.