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Nomenclatural changes in Onagraceae.

Peter C Hoch1, Kanchi Gandhi2

  • 1Missouri Botanical Garden, 4344 Shaw Blvd., St. Louis, Missouri 63110-2291, USA Missouri Botanical Garden St. Louis United States of America.

Phytokeys
|April 25, 2020
PubMed
Summary

This study introduces a new subspecies of Ludwigia glandulosa and two new combinations within the Onagraceae family. These taxonomic revisions clarify species distinctions and distributions in the Onagraceae family.

Keywords:
BoisduvaliaChamaenerionLudwigiafireweedsnomenclature

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Area of Science:

  • Botany
  • Plant Taxonomy
  • Systematics

Background:

  • The Onagraceae family, commonly known as the evening primrose family, exhibits complex taxonomic relationships.
  • Previous classifications have recognized distinct groups within genera like Epilobium and Ludwigia, necessitating further systematic study.

Purpose of the Study:

  • To formally describe a new subspecies within the Ludwigia genus.
  • To reclassify specific species groups within Epilobium and Chamaenerion, proposing new combinations.

Main Methods:

  • Morphological analysis of plant specimens, focusing on key diagnostic features such as capsules, leaves, and seed coat characteristics.
  • Comparative taxonomic study to determine distinctiveness and propose new taxonomic ranks and combinations.

Main Results:

  • Description of Ludwigia glandulosa Walter subsp. brachycarpa C.-I Peng, subsp. nov., distinguished by smaller capsules and leaves, unique seed coat, and limited geographic range.
  • Proposal of Epilobium sect. Pachydium (Fischer & C. A. Meyer) Hoch & K. Gandhi, comb. nov., consolidating species previously under Boisduvalia.
  • Proposal of Chamaenerion speciosum (Decaisne) Hoch & K. Gandhi, comb. nov., for a distinct Himalayan species.

Conclusions:

  • The proposed taxonomic changes enhance the understanding of Onagraceae phylogeny and systematics.
  • These revisions provide a clearer framework for future research on the distribution, evolution, and conservation of these plant groups.