Kaliwatan sa tanom nga bulak ang Berkheya rigida.^[1] Una ning gihulagway ni Carl Peter Thunberg, ug gihatagan sa eksakto nga ngalan ni Harry Bolus, Wolley-dod ug Margaret Rutherford Bryan Levyns.^[2] Ang Berkheya rigida sakop sa kahenera nga Berkheya, ug kabanay nga Asteraceae.^[1][3]

Kini nga matang hayop na sabwag sa:

• Habagatang Aprika
  • Free State
  • Province of KwaZulu-Natal
  • Province of the Western Cape
• Ostralya
  • State of Western Australia
  • State of South Australia
  • State of Victoria
  • State of Tasmania
• Inglatera

Walay nalista nga matang nga sama niini.^[1]

1. ↑ ^{1.0 1.1 1.2} Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed) (2019). "Species 2000 & ITIS Catalogue of Life: 2019 Annual Checklist". Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X. TaxonID: 53614515. Retrieved 2019-11-11. ((cite web)): |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Levyns (1950) , In: Adamson & Salter, Fl. Cape Penins. 834
3. ↑ Hassler M. (2019). World Plants: Synonymic Checklists of the Vascular Plants of the World (version Nov 2018). In: Species 2000 & ITIS Catalogue of Life, 2019 Annual Checklist (Roskov Y., Ower G., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., Nieukerken E. van, Zarucchi J., Penev L., eds.). Digital resource at www.catalogueoflife.org/annual-checklist/2019. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X.