Asteraceae The Asteraceae are distinctive in being herbs, shrubs, vines, or trees, the inflorescence a head & x28;capitulum& x29; subtended by an involucre of phyllaries, flowers either bilabiate, disk, or ray/ligulate & x28;heads of many taxa a mixture of central disk flowers and peripheral ray flowers& x29;, with the calyx, termed a pappus, modified as scales, awns, or capillary or plumose bristles & x28;or absent& x29;, the androecium syngenesious, the ovary inferior with a single, basal ovule, the fruit a multiple of achenes.
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