Erigeron acer
Erigeron acer is a widespread species of herbaceous flowering plant in the family Asteraceae. Common names include bitter fleabane and blue fleabane. The species is native to Canada, colder parts of the United States, northern, central, and southeastern Asia, and most of Europe. Erigeron acer is a biennial or perennial herb up to 100 cm (40 inches) tall, producing a taproot and a woody rhizome. One plant can produce many small flower heads, each with pink, lilac, or occasionally white ray florets and yellow disc florets. Subspecies and varieties:
Erigeron acris subsp. acris
Erigeron acris subsp. angulosus (Gaudin) Vacc. Erigeron acris subsp. arctophilus (Rech.f.) Rech.f. Erigeron acris subsp. asadbarensis (Vierh.) Rech.f. Erigeron acris subsp. botschantzevii
Erigeron acris subsp. brachycephalus (H.Lindb.) Erigeron acris subsp. droebachensis (O.F.Müll.) Arcang. Erigeron acris subsp. kamtschaticus (DC.) Erigeron acris var. khasianus (Hook.f.) Erigeron acris subsp. lalehzaricus. Erigeron acris subsp. mesatlanticus (Maire) Maire
Erigeron acris var. multicaulis (Wall. ex DC.) Erigeron acris subsp. phaeocephalus. Erigeron acris subsp. podolicus (Besser) Nyman
Erigeron acris subsp. politu (Fr.) H.Lindb. Erigeron acris subsp. pycnotrichus (Vierh.) Grierson
Erigeron acris subsp. staintonii. References

External links
Plants for a Future database

acer
Flora of Asia
Flora of Europe
Flora of Northern America
Plants described in 1753
Taxa named by Carl Linnaeus