Vallejo-Marin M (2017) Revealed: the first ever flower, 140m years ago, looked like a magnolia. The Conversation. 01.08.2017. https://theconversation.com/revealed-the-first-ever-flower-140m-years-ago-looked-like-a-magnolia-81861
First paragraph: Although most species of plants on Earth have flowers, the evolutionary origin of flowers themselves are shrouded in mystery. Flowers are the sexual organs of more than 360,000 species of plants alive today, all derived from a single common ancestor in the distant past. This ancestral plant, alive sometime between 250m and 140m years ago, produced the first flowers at a time when the planet was warmer, and richer in oxygen and greenhouse gases than today. A time when dinosaurs roamed primeval landscapes.