Kaliwatan sa tanom nga bulak ang Silphium perplexum.^[1] Una ning gihulagway ni J. R. Allison.^[2] Ang Silphium perplexum sakop sa kahenera nga Silphium, ug kabanay nga Asteraceae.^[1][3]

Kini nga matang hayop na sabwag sa:

• Alabama

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: 53630636. Retrieved 2019-11-11. ((cite web)): |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ J. R. Allison (2001) , In: Castanea 66(1–2): 188
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.