flax-leaf fleabane (erigeron bonariensis). flowering capitulum closeup

argentine fleabane asteraceae belarus flora compositae conyza bonariensis erigeron anthesis asthma weed biseriate black background botanical science botany bract capitulum closeup costate disc floret filiform flaxleaf flower focus stacking foliaceous hairy horseweed head herbaceous hispidulous inflorescence involucral involucre ligulate ligule macro nature peduncle phyllary plants ray subulate tubular virtual herbarium wavyleaf indumentum