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Quercus Furuhjelmi
''Quercus furuhjelmi'' was a type of 'brown (or chestnut) oak' that lived in the Paleogene period. It is only known by its fossil remains, which have been found in Kazakhstan and Alaska. According to some authorities (Trelease, 1924), they were related to the white oaks, subgenus ''Lepidobalanus'' (or ''Leucobalanus'') while others relate them to the ''Heterobalanus'' of East Asia. Chestnut oaks are a seemingly polyphyletic A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of conver ... group. The chestnut oaks of East Asia (for example '' Q. crispula'' Blume) have been placed in the subgenus ''Heterobalanus'', while a chestnut oak from western North America'' Q. sadleriana'' R.Br.teris considered by some to be a member of the ''Leucobalanus'' subgenus and by others to be in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oswald Heer
Oswald Heer (or Oswald von Heer) (31 August 1809 – 27 September 1883), Swiss geologist and naturalist, was born at Niederuzwil in Canton of St. Gallen and died in Lausanne. Biography Oswald Heer was educated as a clergyman at Halle and took holy orders, and he also graduated as Doctor of Philosophy and medicine. Early in life his interest was aroused in entomology, on which subject he acquired special knowledge, and later he took up the study of plants and became one of the pioneers in paleobotany, distinguished for his researches on the Miocene flora. In 1837, Carl Daniel Friedrich Meissner (1800–1874) a Swiss botanist named a genus of flowering plants (in the family of Anacardiaceae) from South Africa after him, '' Heeria''. In 1851, Heer became professor of botany in the university of Zürich, and for some time he was the director of what is now the Old Botanical Garden in that city. He directed his attention to the Tertiary plants and insects of Switzerland. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogene
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (annum, Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The earlier term Tertiary Period was used to define the span of time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognised as a formal stratigraphy, stratigraphic term, 'Tertiary' is still widely found in earth science literature and remains in informal use. Paleogene is often abbreviated "Pg" (but the United States Geological Survey uses the abbreviation PE for the Paleogene on the Survey's geologic maps). During the Paleogene, evolution of mammals, mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyletic
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned more with ecology than with systema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quercus Crispula
''Quercus crispula'', commonly known as mizunara from the Japanese, is a deciduous broad-leaved tree of the genus ''Quercus''. As ''Quercus mongolica'' var. ''crispula'', it is considered a variety of ''Mongolian oak'' by some authorities, WFO (2020): Quercus crispula Blume. Published on the Internet at http://www.worldfloraonline.org/taxon/wfo-0000290363. Accessed 2020-03-03 and is widely distributed in Northeast Asia. Description It prefers a colder climate than the closely related '''' and Kunugi ('''' ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quercus Sadleriana
''Quercus sadleriana'' is a species of oak known by the common names Sadler's oak and deer oak. It is native to southwestern Oregon and far northern California in the Klamath Mountains. It grows in coniferous forests. It is placed in section ''Ponticae''. Description ''Quercus sadleriana'' is an evergreen In botany, an evergreen is a plant which has foliage that remains green and functional through more than one growing season. This also pertains to plants that retain their foliage only in warm climates, and contrasts with deciduous plants, whic ... shrub growing tall from a root network with rhizomes. The leaves are reminiscent of chestnut leaves, oval with toothed edges and rounded, faintly pointed ends. The fruit is an acorn with a cap between wide and a spherical or egg-shaped, round-ended nut up to long. References External links * * sadleriana Flora of the West Coast of the United States Flora of the Klamath Mountains Plants described in 1871 Flora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
