Understanding how species maintain species boundaries requires an integrative species concept that draws on diverse data sources. In this issue, Feng et al. (p. 189) present a study synthesizing genetic, ecological, and environmental evidence to elucidate the speciation dynamics of Regal-Henry lilies, a monophyletic yet dimorphic group of Lilium. The results underscore that divergence is driven by a combination of both adaptive and non-adaptive processes. These findings emphasize the intricate interplay of historical climate changes, ecological adaptation, and gene flow in shaping biodiversity.

(Image Credit: Changqiu Liu)