Heterostylous plants have floral morphs bearing female and male sex organs at reciprocal heights. Here the authors show that, across angiosperms, heterostyly is associated with tubed flowers pollinated by long-tongued insects, supporting the Darwinian hypothesis about precise pollen transfer between heterostylous morphs.
- Violeta Simón-Porcar
- Marcial Escudero
- Juan Arroyo
