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Deciduous: leaves falling away from the plant (not evergreen).
Decussate: referring to opposite leaves as they alternate, in pairs, at rights angles along the stem
Dehiscent: Splitting open at maturity (refers to a fruit opening to release seeds or to anthers opening to release pollen).
Dioecious: having staminate (male) and pistillate (female) flowers on separate plants.
Disk (disc) floret: A tubular flower found in the center of many members of the Aster family.
Double serrate (or doubly toothed): Coarse serrations (teeth) bear smaller serrations on their margins (describes a leaf margin).
Elliptic: An oval shape widest in the middle and narrowed on both ends.
Entire: Unbroken or not toothed (describes the margin of the leaf).
Evergreen: Retaining green foliage throughout the year.
Follicle: A fruit derived from a single ovary and opening along a single suture. Example: milkweed, columbine.
Fruit: The ripened ovary of the flower.