แหล่งที่มา WikiPedia: Ptychotis http://www.ville-ge.ch/musinfo/bd/cjb/africa/detai... http://www.ipni.org/ipni/idPlantNameSearch.do?id=4... http://www.irmng.org/aphia.php?p=taxdetails&id=129... http://www.plantsoftheworldonline.org/taxon/urn:ls... http://legacy.tropicos.org/Name/40020544 https://npgsweb.ars-grin.gov/gringlobal/taxonomyge... https://www.itis.gov/servlet/SingleRpt/SingleRpt?s... https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwt... https://gd.eppo.int/taxon/1PYQG https://eol.org/pages/2512407
