Synonyms: Aster bubonium; Aster pubescens (heterotypic); Aster squarrosus (heterotypic); Erigeron squarrosus (heterotypic); Helenium cordatum; Helenium hispidum; Helenium squarrosum; Inula adriatica; Inula bubonium (heterotypic); Inula cordata (heterotypic); Inula foliosa (homotypic); Inula germanica (heterotypic); Inula hispida; Inula myrtifolia; Inula scaberrima; Inula semiamplexicaulis var. adriatica; Inula spiraeifolia (homotypic); Inula spiraeifolia var. pilosa; Inula squarrosa (heterotypic); Inula squarrosa scaberrima; Inula squarrosa spiraeifolia; Inula squarrosa var. scaberrima; Pentanema adriaticum; Pentanema hispidum