Answer: The term "calyx" means collectively, all of the sepals in a flower. Sepals are generally green and cover the petals of a flower before the flower opens. Prior to opening, a rhododendron flower bud is quite fat and the calyx is easy to see. When the flower bud opens, you will find several individual blooms, all connected to a soft "stem". This group of flowers is called a "truss". The calyx will not be as evident in an opened rhododendron bloom as it would be in a simpler flower such as a rose. Hope this clarifies things for you!
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