Ключевые слова: androecium, anther, anthesis, asteraceae, bidens, bidens frondosa, bur marigold, calicular bract, calycle, campanulate, capitulum, common beggarticks, compositae, connate, corolla, devils beggarticks, devils bootjack, devils pitchfork, disc floret, filament, floret, flower, gynoecium, head, hirsute, indumentum, inflorescence, involucral bract, involucre, leafy beggarticks, ligulate floret, phyllary, pistil, pitchfork weed, pollen, ray floret, stamen, sticktights, stigma, style, tickseed sunflower, tubular floret,