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How do Purdiea flowers differ from Clethra flowers?

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Cluster of blooming pink azaleas, Rhododendron roseum, with green leaves and dark foliage in the background. — Ericales Flowering rhododendron.

Within the Clethraceae family of the order Ericales, the primary distinction between the flowers of the two genera lies in their size and visual impact.

While the genus Clethra is characterized by small, fragrant flowers typically arranged in terminal, racemose inflorescences, the flowers of the genus Purdiea are notably different in appearance. Specifically, Purdiea flowers are described as being considerably larger and more showy than those produced by Clethra.12