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A corolla is dipetalous, tripetalous, tetrapetalous or pentapetalous according as it has two, three, four or five separate petals.

Triadelphous†, triangular, tricuspid, tricapsular†, tridental†, tridentate, tridentiferous†, trifoliate, trifurcate, trigonal†, trigrammic†, trigrammatic†, tripetalous†, tripodal, tripodic†, triquetral†, triquetrous†.