noun

• Any of various species of flowering plants in certain genera in family Asteraceae, that typically repel insects:
• mostly in two tribes of subfamily Asteroideae
• in tribe Astereae
• Conyza spp. (butterweeds or horseweed)
• Erigeron spp., especially Erigeron acre (blue fleabane)
• in tribe Inuleae
• Inula spp. (yellowheads)
• Pluchea spp. (camphorweeds)
• Pulicaria spp. (false fleabane), especially common fleabane (Pulicaria dysenterica subsp. dysenterica, formerly Inula dysenterica)
• Also, in subfamily Cichorioideae, Vernonia spp. (ironweeds).