http://en.wikipedia.org/wiki/Flower
The are four main whorls. (starting from the base of the flower or lowest node and working upwards)
The first one is:-
Vegetative (Perianth)
Collectively the Calyx and Corolla form the Perianth
- Calyx: the outermost whorl consisting of units called sepals; these are typically green and enclose the rest of the flower in the bud stage, however, they can be absent or prominent and petal-like in some species.
- Corolla: the next whorl toward the apex, composed of units called petals, which are typically thin, soft and colored to attract animals that help the process of pollination.
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