Cistus x obtusifolius (snow fire rock rose) 1 (49098085941)

Description:

Description: Plants are multicellular, photosynthesizing eucaryotes. Most species occupy terrestrial environments, but they also occur in freshwater and saltwater aquatic environments. The oldest known land plants in the fossil record are Ordovician to Silurian. Land plant body fossils are known in Silurian sedimentary rocks - they are small and simple plants (e.g., Cooksonia). Fossil root traces in paleosol horizons are known in the Ordovician. During the Devonian, the first trees and forests appeared. Earth's initial forestation event occurred during the Middle to Late Paleozoic. Earth's continents have been partly to mostly covered with forests ever since the Late Devonian. Occasional mass extinction events temporarily removed much of Earth's plant ecosystems - this occurred at the Permian-Triassic boundary (251 million years ago) and the Cretaceous-Tertiary boundary (65 million years ago). The most conspicuous group of living plants is the angiosperms, the flowering plants. They first unambiguously appeared in the fossil record during the Cretaceous. They quickly dominated Earth's terrestrial ecosystems, and have dominated ever since. This domination was due to the evolutionary success of flowers, which are structures that greatly aid angiosperm reproduction. The snow fire rock rose, Cistus x obtusifolius, is a man-made hybrid, a cross between two natural species of Cistus. This flowering plant is native to circum-Mediterranean areas and some islands in the eastern Atlantic Ocean. Classification: Plantae, Angiospermophyta, Malvales, Cistaceae Locality: grounds of Calistoga Petrified Forest, northern side of Petrified Forest Road, west-southwest of the town Calistoga, eastern Sonoma County, Coast Ranges of northwest-central California, USA See info. at: en.wikipedia.org/wiki/Cistus. Date: 13 July 2010, 17:59. Source: Cistus x obtusifolius (snow fire rock rose) 1. Author: James St. John.