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Annals of Botany 80: 377-379, 1997
© 1997 Annals of Botany Company

COMMUNICATION

Age-determination of Dicotyledonous Herbaceous Perennials by Means of Annual Rings: Exception or Rule?

HANSJÖRG DIETZ and ISOLDE ULLMANN

Julius-von-Sachs-Institut für Biowissenschaften, Lehrstuhl für Botanik II, Mittlerer Dallenbergweg 64, D-97082, Würzburg, Germany

October 4, 1996 ; February 28, 1997 .

ABSTRACT

Thirty-five herbaceous dicotyledonous perennial plant species, with permanent root systems, from 16 families, were examined for the presence of growth rings in the secondary root xylem. Most of the species surveyed showed ring zonations in the roots, and these could be verified as annual growth rings in the ten species for which plants of known age were available. The potential value of ‘herbchronology’ as a tool in ecological investigations of species and stands of perennial herbs of temperate zones is discussed.

Annual rings; age-determination; dendroecology; herbaceous perennials; anatomical patterns; secondary root xylem


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