New fossils push the origin of flowering plants back by 100 million years to the early Triassic

Flowering plants evolved from extinct plants related to conifers, ginkgos, cycads, and seed ferns. The oldest known fossils from flowering plants are pollen grains. These are small, robust and numerous and therefore fossilize more easily than leaves and flowers.

Walden Pond flowers reveal effects of global warming

A hundred and fifty years after his death, Henry Thoreau has helped demostrate the effects of global warming on plant life in the US.