common beggarticks (bidens frondosa). flowering capitulum closeup (calycle removed

asteraceae bidens frondosa compositae androecium anther anthesis campanulate capitulum connate corolla disc floret filament flower gynoecium head hirsute indumentum inflorescence involucral bract involucre phyllary pistil pollen stamen stigma style tubular common beggarticks bur marigold devil 039 bootjack pitchfork leafy weed sticktights tickseed sunflower frondosa flowering closeup calycle removed virtual herbarium belarus flora: focus-stacked closeups wild cultivated plants including flowers leaves fruits intended illustrations botanical manuals