"...we may equally well say that a stamen is a contracted petal, as that a petal is a stamen in a state of expansion; or that a sepal is a contracted stem leaf approaching a certain stage of refinement, as that a stem leaf is a sepal expanded by the influx of cruder saps."
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Original Language: English
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Sources
J.W. von Goethe (1790), Versuch die Metamorphose der Pflanzen zu erklaren. Gotha, Ettlinger; paragraph 120.
https://en.wikiquote.org/wiki/ABC_model_of_flower_development
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ABC model of flower development
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