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The basal eudicots are a group of 13 related families of flowering plants in four orders: Buxales, Proteales, Ranunculales and Trochodendrales.[1][a] Like the core eudicots (the rest of the eudicots), they have pollen grains with three colpi (grooves) or other derived structures,[4] and usually have flowers with four or five petals (sometimes multiples of four or five, sometimes reduced or fused).[5] Unlike other eudicots, they sometimes have flowers with petals in twos or multiples of two.[6]

The basal eudicots include trees, shrubs, woody vines and herbaceous plants.[7] Cultivars of Buxus are used for hedges and topiary, and the high-quality wood is commonly used for decorative carvings and musical instruments.[8] The sacred lotus is the national flower of India and Vietnam, and the waratah is the floral emblem of the Australian state of New South Wales.[9] The opium poppy, Papaver somniferum, a source of morphine, was cultivated thousands of years ago in Mesopotamia.[10] Macadamia nuts are mainly grown in Hawaii and Australia.[11]