Deciduous: a plant that sheds its leaves at the end of the growing season.
Dioecious: male and female flowers are borne on separate plants.
Endemic: a species or taxonomic group that is only found in one particular country or geographic area.
Whorl: in animals, the spiral or convolutions in the shell of a snail. In plants, a set of leaves, flowers, or branches that spring from a stem at the same point and encircle it.