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Updated: Jun 24, 2026

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Angiosperm leaf vein evolution was physiologically and environmentally transformative.

C Kevin Boyce1, Tim J Brodribb, Taylor S Feild

  • 1Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA. ckboyce@uchicago.edu

Proceedings. Biological Sciences
|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Flowering plants (angiosperms) possess significantly higher leaf vein densities than other plants, enabling greater water transport and photosynthesis. This unique trait likely made high assimilation rates and rainforest precipitation unique to angiosperm evolution.

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Area of Science:

  • Plant Biology
  • Evolutionary Biology
  • Paleobotany

Background:

  • Leaf vein density varies significantly across plant lineages.
  • Angiosperms exhibit exceptionally high leaf vein densities compared to other vascular plants.
  • Vein density is correlated with leaf assimilation and transpiration rates.

Purpose of the Study:

  • To quantify and compare leaf vein densities across vascular plant lineages.
  • To investigate the physiological implications of high vein density in angiosperms.
  • To explore the evolutionary history and environmental impact of angiosperm leaf traits.

Main Methods:

  • Comparative analysis of leaf vein density measurements.
  • Correlation analysis between vein density, assimilation, and transpiration.
  • Extrapolation of physiological capabilities to extinct plant lineages.

Main Results:

  • Angiosperm leaf vein densities average 8 mm/mm², significantly exceeding non-angiosperms (approx. 2 mm/mm²).
  • High vein density in angiosperms supports unparalleled transpiration and assimilation rates.
  • Leaf vein density is a reliable proxy for estimating extinct plant physiology.

Conclusions:

  • The high leaf vein density and associated physiological rates of angiosperms are unique in evolutionary history.
  • Angiosperm evolution may have significantly influenced global water cycles, particularly in tropical rainforests.
  • Fossilizable leaf traits like vein density offer new insights into plant evolution and past environments.