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Formation of Species

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Related Experiment Video

Updated: Mar 19, 2026

Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

Published on: April 12, 2018

Faster speciating cacti have faster evolving flowers.

Jamie B Thompson¹, Chris Venditti¹

¹School of Biological Sciences, University of Reading, Reading, Berkshire, UK.

Biology Letters

|March 17, 2026

Summary

This summary is machine-generated.

Rapid flower-length evolution, not specific flower shapes, drives cactus speciation and diversity. This evolutionary tempo explains the cactus family

Keywords:

Cactaceae biodiversity evolution flowers phylogenetic comparative methods speciation

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Area of Science:

Evolutionary Biology
Plant Speciation
Biodiversity

Background:

Biodiversity arises from speciation rate variations.
Both trait values and evolutionary rates influence diversification.
These factors can operate independently.

Purpose of the Study:

To test if speciation in cacti depends on flower length variation or the rate of flower-length evolution.
To investigate the relationship between floral morphology, evolutionary rates, and diversification in the cactus family.

Main Methods:

Analyzed flower length variation and evolutionary rates across over 750 cactus species.
Utilized phylogenetic comparative methods to assess the relationship between traits, evolutionary rates, and speciation.

Main Results:

Flower length variation showed a weak relationship with speciation.
The rate of flower-length evolution strongly predicted speciation rates.
Flower length and its rate of evolution were weakly correlated.

Conclusions:

The tempo of floral evolution, not specific floral morphology, is a key driver of cactus diversification.
Challenges the hypothesis that specialized morphologies directly accelerate diversification.
Highlights the importance of evolutionary rates in explaining extraordinary species diversity.