Biology:Dahlgren system

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Short description: System of flowering plant classification

One of the modern systems of plant taxonomy, the Dahlgren system was published by monocot specialist Rolf Dahlgren in 1975[1] and revised in 1977,[2] and 1980.[3] However, he is best known for his two treatises on monocotyledons in 1982 [4] and revised in 1985.[5] His wife Gertrud Dahlgren continued the work after his death.[6]

Dahlgren ranked the dicotyledons and monocotyledons as subclasses of the class of flowering plants (angiosperms) and further divided them into superorders. Originally (1975) he used the suffix -anae, as did Cronquist, to designate these, but in 1980 changed this to -florae in accordance with Thorne. In the 1989 revision, published by his wife, the alternate names Magnoliidae and Liliidae were dropped in favour of Dicotyledon and Monocotyledon, and the suffix -florae reverted to -anae (e.g. Alismatanae for Alismatiflorae).

Reveal provides an extensive listing of Dahlgren's classification.[7] (Note the synonyms, both nomenclatural and taxonomic, for each name in the system.)

1980 system

Summary

  • Class Magnoliopsida (flowering plants (Angiospermae or Magnoliophyta)
    Subclass Magnoliidae (dicotyledons) 24 superorders
    • Superorder Magnoliiflorae
      Superorder Nymphaeiflorae
      Superorder Ranunculiflorae
      Superorder Caryophylliflorae
      Superorder Polygoniflorae
      Superorder Malviflorae
      Superorder Violiflorae
      Superorder Theiflorae
      Superorder Primuliflorae
      Superorder Rosiflorae
      Superorder Podostemiflorae
      Superorder Fabiflorae
      Superorder Proteiflorae
      Superorder Myrtiflorae
      Superorder Rutiflorae
      Superorder Santaliflorae
      Superorder Balanophoriflorae
      Superorder Araliiflorae
      Superorder Asteriflorae
      Superorder Solaniflorae
      Superorder Corniflorae
      Superorder Loasiflorae
      Superorder Gentianiflorae
      Superorder Lamiiflorae
    Subclass Liliidae (monocotyledons) 7 superorders
    • Superorder Alismatiflorae
      Superorder Triuridiflorae
      Superorder Ariflorae
      Superorder Liliiflorae
      Superorder Zingiberiflorae
      Superorder Commeliniflorae
      Superorder Areciflorae

Magnoliidae (dicotyledons)

1982 system (monocotyledons)

Summary

Six superorders

  • Superorder Alismatiflorae
  • Superorder Ariflorae
  • Superorder Liliiflorae
  • Superorder Zingiberiflorae
  • Superorder Commeliniflorae
  • Superorder Areciflorae

Details

1985 system (monocotyledons)

Summary

Ten superorders

  • Superorder Liliiflorae
  • Superorder Ariflorae
  • Superorder Triuridiflorae
  • Superorder Alismatiflorae
  • Superorder Bromeliiflorae
  • Superorder Zingiberiflorae
  • Superorder Commeliniflorae
  • Superorder Cyclanthiflorae
  • Superorder Areciflorae
  • Superorder Pandaniflorae

Details

Liliiflorae

Ariflorae

Triuridiflorae

Alismatiflorae

Bromeliiflorae

Zingiberiflorae

Commeliniflorae

Cyclanthiflorae

  • Superorder Cyclanthiflorae 1 order p. 461
    Order Cyclanthales
    Family Cyclanthaceae

Areciflorae

Pandaniflorae

Notes

References

  1. ↑ Dahlgren 1975.
  2. ↑ Dahlgren 1977.
  3. ↑ Dahlgren 1980.
  4. ↑ Dahlgren & Clifford 1982.
  5. ↑ Dahlgren, Clifford & Yeo 1985.
  6. ↑ Dahlgren 1989.
  7. ↑ JL Reveal:Dahlgren System of Angiosperm Classification 1997

Bibliography



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