Floral morphogenesis in Euptelea (Eupteleaceae, Ranunculales)

Area of Science:

• Botany
• Developmental Biology
• Phylogenetics

Background:

• Eupteleaceae is a unigeneric family with a basal phylogenetic position in Ranunculales, near the base of eudicots.
• Molecular phylogenetics places Euptelea at a critical juncture for understanding early eudicot evolution.

Purpose of the Study:

• To investigate the floral developmental features of Euptelea pleiosperma.
• To contextualize Euptelea morphologically within other basal eudicots.

Main Methods:

• Flowers of Euptelea pleiosperma were collected across developmental stages.
• Scanning electron microscopy was used to study floral development.

Main Results:

• Flowers lack perianth remnants and exhibit changing symmetry (monosymmetric to asymmetric to disymmetric).
• Floral organ initiation shows complex patterns, with carpels arising between stamens, and carpels are ascidiate with a two-crested stigma.

Conclusions:

• Euptelea flowers possess autapomorphies like wind pollination and floral disymmetry.
• The genus also displays plesiomorphies such as free carpels and basifixed anthers, supporting its placement within Ranunculales.