flax-leaf fleabane (erigeron bonariensis). floral buds closeup

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