Karis, Per Ola, and Robert J. Mckenzie. 2024. “Second-Step Lectotypification of Stobaea rigida and Reassessment of Heterotypic Synonyms of Berkheya rigida (Asteraceae, Arctotideae)”. Phytotaxa 641 (4). Auckland, New Zealand:267-76. https://doi.org/10.11646/phytotaxa.641.4.3.