File:Rhododendron maximum (Fox Creek, Grayson County, Virginia, USA) 5 (30421473015).jpg
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Rhododendron maximum Linnaeus, 1753 in Virginia, USA. (October 2016) 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. Rhododendron is a genus of about one thousand species of woody shrubs and trees. Rhododendron maximum is a common component of forests in the Appalachian Mountains of eastern America and far-southeastern Canada. This species is an evergreen - it has green leaves all year, even during the winter. Other Rhododendron species are deciduous. The individual leaves that are yellow-colored in the above photo are older leaves - they will detach and become forest floor leaf litter. Classification: Plantae, Angiospermophyta, Ericales, Ericaceae Locality: next to roadcut on the southern side of Rt. 603, across from Fox Creek, west of the town of Troutdale, northwestern Grayson County, southwestern Virginia, USA See info. at: <a href="https://en.wikipedia.org/wiki/Rhododendron" rel="nofollow">en.wikipedia.org/wiki/Rhododendron</a> and <a href="https://en.wikipedia.org/wiki/Rhododendron_maximum" rel="nofollow">en.wikipedia.org/wiki/Rhododendron_maximum</a> |
| Date | |
| Source | Rhododendron maximum (Fox Creek, Grayson County, Virginia, USA) 5 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30421473015. It was reviewed on 12 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 04:45, 12 November 2019 | | 4,000 × 3,000 (4.16 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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