In the British Adoxa the uppermost flower generally has two calyx-lobes with the other organs tetramerous, whilst the surrounding flowers generally have three calyx-lobes with the other organs pentamerous. From Wordnik.com. [VII. Miscellaneous Objections to the Theory of Natural Selection] Reference
In the common rue and some other plants, one flower, usually the central or terminal one, opens first, and has five sepals and petals, and five divisions to the ovarium; whilst all the other flowers on the plant are tetramerous. From Wordnik.com. [VII. Miscellaneous Objections to the Theory of Natural Selection] Reference
Would you not consider as a morphological difference the trimerous, tetramerous, etc., divisions of flowers, the ovules being erect or suspended, their attachment being parietal or placental, and even the shape of the seed when of no service to the plant. From Wordnik.com. [More Letters of Charles Darwin — Volume 2] Reference
It is so common to observe on the same plant, flowers indifferently tetramerous, pentamerous, &c., that I need not give examples; but as numerical variations are comparatively rare when the parts are few, I may mention that, according to De Candolle, the flowers of Papaver bracteatum offer either two sepals with four petals (which is the common type with poppies), or three sepals with six petals. From Wordnik.com. [VII. Miscellaneous Objections to the Theory of Natural Selection] Reference
Flowers tetramerous. From Wordnik.com. [The Medicinal Plants of the Philippines] Reference
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