`stemless inula` flowers - inula rhizocephala

arboretum asia asian aster asteraceae bloom blossom botanic botanical botany britannica bunch central china chinese cluster compositae composite conyza crithmoides daisy flora floret flower gallen garden golden green group head inula leaf natural nature petal plant rhizocephala rhizocephaloides saint salicina schrenk stalk stemless sunflower swiss switzerland yellow yellowhead