Abstract
The physiological age of a plant or its parts is important for quantitative studies in Ecology. It is demonstrated by measurements of leaf size that the number of nodes from the apex in individuals is a good indicator of the physiological age among natural populations. Hence, it is suggested that for measurements of leaf and internode of individuals in a heterogenous population a definite size range for the uppermost or the first visible leaf or internode be fixed for counting downwards. The plastochron index be, however, used for other quantitative estimations in ecological studies.
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