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| Description: (a) An orchid of the genus Cattleya has fused stamens and carpals, and six tepals, one of which is specialized to form a lower lip. (b) An inflorescence (head) of sunflower (genus Helianthus). This inflorescence includes a rim of flowers with conspicuous petals that attract pollinators and an inner disk of flowers that lack attractive perianths. (c) Grass flowers of the genus Triticum lack a showy perianth.
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