Stirton, Charles H., and Brian du Preez. “Otholobium Outrampsii (Psoraleeae, Fabaceae) – a New Species from the Western Cape, South Africa”. Bothalia, African Biodiversity & Conservation 51, no. 2 (August 10, 2021). Accessed September 23, 2021. https://abcjournal.org/index.php/BothaliaABC/article/view/193.