Annual rings in native and introduced forbs of lower Michigan, U.S.A.

@article{Dietz2002AnnualRI,
  title={Annual rings in native and introduced forbs of lower Michigan, U.S.A.},
  author={Hansj{\"o}rg Dietz and Fritz Hans Schweingruber},
  journal={Botany},
  year={2002},
  volume={80},
  pages={642-649}
}
Almost nothing is known about the presence of annual growth rings in North American perennial herbs and, correspondingly, the age of forbs is also largely unknown. In this study we sampled established individuals of dicotyledonous perennial herbs (60 species) in different habitats in lower Michigan (U.S.A.) and analyzed the main roots for the presence of growth rings in the secondary xylem. Two thirds of the species showed clearly or relatively clearly demarcated growth rings in the root xylem… Expand
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