Jackson, Mariëtte, Juanita van Zyl, Magdil Frylinck, and Lize Joubert. 2024. “A Molecular Phylogeny of Garuleum (Calenduleae, Asteraceae) in Southern Africa”. Phytotaxa 644 (3). Auckland, New Zealand:220-28. https://doi.org/10.11646/phytotaxa.644.3.5.