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Evolutionary history of plants. A late Silurian sporangium, artificially colored. Green: A spore tetrad. Blue: A spore bearing a trilete mark – the Y -shaped scar. The spores are about 30–35 μm across. The evolution of plants has resulted in a wide range of complexity, from the earliest algal mats of unicellular archaeplastids evolved ...
Most of these plants have true roots and leaves, and many were quite tall. The tree-like Archaeopteris, ancestral to the gymnosperms, and the giant cladoxylopsid trees had true wood. These are the oldest known trees of the world's first forests. Prototaxites was the fruiting body of an enormous fungus that stood more than 8 meters tall. By the ...
Douglas-firs are medium-size to extremely large evergreen trees, 20–100 metres (70–330 feet) tall (although only Pseudotsuga menziesii var. menziesii, common name coast Douglas-firs, reach heights near 100 m) [ 10] and commonly reach 2.4 m (8 ft) in diameter, [ 11] although trees with diameters of almost 5 metres (16 feet) exist. [ 12]
Paleoethnobotany. Flotation machine in use at Hallan Çemi, southeast Turkey, c. 1990. Note the two sieves catching charred seeds and charcoal, and the bags of archaeological sediment waiting for flotation. Paleoethnobotany (also spelled palaeoethnobotany), or archaeobotany, is the study of past human-plant interactions through the recovery and ...
In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height.
Rowan is used as a food plant by the larvae of some Lepidoptera species; see Lepidoptera that feed on Sorbus. Mature European rowan tree The best-known species is the European rowan Sorbus aucuparia , a small tree typically 4–12 metres (13–39 ft) tall growing in a variety of habitats throughout northern Europe and in mountains in southern ...
Alabama’s Mobile-Tensaw Delta is a more-than 400-square-mile (1,036-square-kilometer) expanse of cypress swamps, oxbow lakes, marshland, hardwood stands and rivers unusually rich in plant and ...
The arboretum is the realization of the dream of William Douglas Cook (1884–1967), who started planting trees on his farm shortly after the First World War. The arboretum is now the National Arboretum of New Zealand, and holds some 4,000 different trees, shrubs and climbers. Taitua Arboretum, Hamilton, New Zealand.