- Conyza canadensis, Canadian Fleabane;Erigeron canadensis L sensu Linnaeus, C 1753;Erigeron pusillus Nutt;Conyza parva Cronquist;Erigeron canadensis L;Canadian horseweed;Erigeron canadensis;Canadian Horseweed;Nipplewort
- Conyza laevigata, Manzanilla horseweed;Erigeron laevigatus
- Conyza primulifolia, Inula primulifolia Lam;Inula primulaefolia orth var Lam;Erigeron primulifolius Lam Greuter;Conyza chilensis Spreng;Conyza scabiosifolia JRemy;Conyza scabiosaefolia orth var JRemy;Primroseleaf horseweed;Conyza chilensis
- Conyza ramosissima, Erigeron divaricatus;Dwarf horseweed;Low Horse-weed;Purple Horse-weed;Dward Fleabane;Dwarf Horseweed;Erigeron divaricatus Michx;Leptilon divaricatum (Michx) Raf
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