D-F 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). Drupe: A fruit in which an outer fleshy layer surrounds a hard ‘stone’ or pit which encloses the seeds. 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. Filament: The stalk of the male stamen. Follicle: A fruit derived from a single ovary and opening along a single suture. Example: milkweed, columbine. Fruit: The ripened ovary of the flower.