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Leaf plastochron index

Leaf plastocron index is a measure of plant leaf age based on morphological development (the plastochron). It is useful in studying plant development requiring destructive measurement on multiple individuals. By measuring a metric against morphological age, instead of chronological time, one can reduce variations occurring between individuals, thus allowing greater focus on variations due to development.<ref>Meicenheimer, R. D. (2014). The plastochron index: Still useful after nearly six decades. American Journal of Botany, 101(11), 1821-1835.</ref>