What are ways species exchange genes with each other? Hybridization and gene flow are shortcuts to biodiversity that don’t always involve differentiation.

More than 70 cultivars of Helianthus exist, with the common sunflower species being Helianthus annuus — Helianthus meaning ...

Asters and native sunflower species in the Helianthus family follow closely behind goldenrod. Smooth blue aster ...