When did the cooksonia live?

Cooksonia, one of the earliest known vascular plants, lived during the Silurian to the early Devonian period, approximately 425 to 400 million years ago. This primitive plant is significant for its role in the evolution of land plants, showcasing early adaptations to terrestrial life. Cooksonia had simple, branching structures and lacked leaves, roots, and true flowers, representing a crucial step in plant development.