The flowers are hermaphrodite and regular with parts in fives (pentamerous) throughout, though exceptions from the pentamerous arrangement occur.

Five equilateral triangles covertically placed would stand on a pentagonal base, and it was found that, by forming several sets of such pyramids, a solid could be obtained which had zo triangular faces, which met in pairs to form 30 edges, and in fives to form 12 vertices.

The parts of the flower are in fives in calyx, corolla and stamens, followed by two carpels which unite to form a superior ovary.

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It has 12 pentagonal faces, and 30 edges, which intersect in fives to form 12 vertices.