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Tetracentron
''Tetracentron'' is a genus of flowering plant with a sole living species being '' Tetracentron sinense'' and several extinct species. It was formerly considered the sole genus in the family Tetracentraceae, though it is now included in the family Trochodendraceae together with the genus ''Trochodendron''. Range The living '' Tetracentron sinense'' is native to southern China and the eastern Himalaya, where it grows at altitudes of in a temperate climate; it has no widely used common name in English, though is sometimes called "spur-leaf". Wood vessels ''Tetracentron'' shares with ''Trochodendron'' the feature, very unusual in angiosperms, of lacking vessel elements in its wood. This has long been considered a very primitive character, resulting in the classification of these two genera in a basal position in the angiosperms; however, research in Molecular phylogenetics by the Angiosperm Phylogeny Group and others has shown that these two genera are not basal angiosperms, but b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracentron Piperoides
''Tetracentron'' is a genus of flowering plant with a sole living species being '' Tetracentron sinense'' and several extinct species. It was formerly considered the sole genus in the family Tetracentraceae, though it is now included in the family Trochodendraceae together with the genus ''Trochodendron''. Range The living '' Tetracentron sinense'' is native to southern China and the eastern Himalaya, where it grows at altitudes of in a temperate climate; it has no widely used common name in English, though is sometimes called "spur-leaf". Wood vessels ''Tetracentron'' shares with ''Trochodendron'' the feature, very unusual in angiosperms, of lacking vessel elements in its wood. This has long been considered a very primitive character, resulting in the classification of these two genera in a basal position in the angiosperms; however, research in Molecular phylogenetics by the Angiosperm Phylogeny Group and others has shown that these two genera are not basal angiosperms, but b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracentron Remberi
''Tetracentron'' is a genus of flowering plant with a sole living species being '' Tetracentron sinense'' and several extinct species. It was formerly considered the sole genus in the family Tetracentraceae, though it is now included in the family Trochodendraceae together with the genus ''Trochodendron''. Range The living '' Tetracentron sinense'' is native to southern China and the eastern Himalaya, where it grows at altitudes of in a temperate climate; it has no widely used common name in English, though is sometimes called "spur-leaf". Wood vessels ''Tetracentron'' shares with ''Trochodendron'' the feature, very unusual in angiosperms, of lacking vessel elements in its wood. This has long been considered a very primitive character, resulting in the classification of these two genera in a basal position in the angiosperms; however, research in Molecular phylogenetics by the Angiosperm Phylogeny Group and others has shown that these two genera are not basal angiosperms, but b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracentron Atlanticum
''Tetracentron'' is a genus of flowering plant with a sole living species being '' Tetracentron sinense'' and several extinct species. It was formerly considered the sole genus in the family Tetracentraceae, though it is now included in the family Trochodendraceae together with the genus ''Trochodendron''. Range The living '' Tetracentron sinense'' is native to southern China and the eastern Himalaya, where it grows at altitudes of in a temperate climate; it has no widely used common name in English, though is sometimes called "spur-leaf". Wood vessels ''Tetracentron'' shares with ''Trochodendron'' the feature, very unusual in angiosperms, of lacking vessel elements in its wood. This has long been considered a very primitive character, resulting in the classification of these two genera in a basal position in the angiosperms; however, research in Molecular phylogenetics by the Angiosperm Phylogeny Group and others has shown that these two genera are not basal angiosperms, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochodendrales
Trochodendraceae is the only family of flowering plants in the order Trochodendrales. It comprises two extant genera, each with a single species along with up to five additional extinct genera and a number of extinct species. The living species are native to south east Asia. The two living species (''Tetracentron sinense'' and ''Trochodendron aralioides'') both have secondary xylem without vessel elements, which is quite rare in angiosperms. As the vessel-free wood suggests primitiveness, these two species have attracted much taxonomic attention. Description ''Tetracentron'' and ''Trochodendron'' are deciduous or evergreen trees, which grow to between tall, with ''Trochodendron'' sometimes sporting umbrella-shaped branches. * Leaves in spirals at the end of the branches (umbrella-like appearance, ''Trochodendron'') or separate ('' Tetracentron''), simple, serrulate or crenulate, with clorantoid teeth, palmately or pinnately divided, brochidodromous or actinodromous, ova ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracentraceae
Trochodendraceae is the only family of flowering plants in the order Trochodendrales. It comprises two extant genera, each with a single species along with up to five additional extinct genera and a number of extinct species. The living species are native to south east Asia. The two living species (''Tetracentron sinense'' and ''Trochodendron aralioides'') both have secondary xylem without vessel elements, which is quite rare in angiosperms. As the vessel-free wood suggests primitiveness, these two species have attracted much taxonomic attention. Description ''Tetracentron'' and ''Trochodendron'' are deciduous or evergreen trees, which grow to between tall, with ''Trochodendron'' sometimes sporting umbrella-shaped branches. * Leaves in spirals at the end of the branches (umbrella-like appearance, ''Trochodendron'') or separate ('' Tetracentron''), simple, serrulate or crenulate, with clorantoid teeth, palmately or pinnately divided, brochidodromous or actinodromous, ovate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochodendraceae
Trochodendraceae is the only family of flowering plants in the order Trochodendrales. It comprises two extant genera, each with a single species along with up to five additional extinct genera and a number of extinct species. The living species are native to south east Asia. The two living species (''Tetracentron sinense'' and ''Trochodendron aralioides'') both have secondary xylem without vessel elements, which is quite rare in angiosperms. As the vessel-free wood suggests primitiveness, these two species have attracted much taxonomic attention. Description ''Tetracentron'' and ''Trochodendron'' are deciduous or evergreen trees, which grow to between tall, with ''Trochodendron'' sometimes sporting umbrella-shaped branches. * Leaves in spirals at the end of the branches (umbrella-like appearance, ''Trochodendron'') or separate ('' Tetracentron''), simple, serrulate or crenulate, with clorantoid teeth, palmately or pinnately divided, brochidodromous or actinodromous, ovate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracentron Sinense
''Tetracentron sinense'' is a flowering plant native to Asia and the sole living species in the genus ''Tetracentron''. It was formerly considered the sole species in the family Tetracentraceae, though ''Tetracentron'' is now included in the family Trochodendraceae together with the genus ''Trochodendron''. Range and habitat It is native to southern China, northern Vietnam and the eastern Himalaya (eastern Nepal, Bhutan, Northeast India, and northern Myanmar), where it grows at altitudes of along streams and forest margins in broad-leaved evergreen and mixed evergreen-deciduous forests. Morphology It is a tree growing to tall. The leaves are deciduous (the ''Flora of China'' reporting it as evergreen is an error), borne singly at the apex of short spur shoots, each leaf dark green, broad heart-shaped, long and broad, with a rugose surface and a serrated margin. The spur shoots bear one leaf each year, slowly lengthening with each subsequent year. The flowers are inconspicuo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracentron Hopkinsii
''Tetracentron hopkinsii'' is an extinct species of flowering plant in the family Trochodendraceae. The species is known from fossil leaves found in the early Eocene deposits of northern Washington state, United States and south Central British Columbia. The species was first described from fossil leaves found in the Allenby Formation. ''T. hopkinsii'' are possibly the leaves belonging to the extinct trochodendraceous fruits '' Pentacentron sternhartae''. Distribution and paleoenvironment ''Tetracentron hopkinsii'' was initially described from two leaves, both recovered from the Early Eocene, Ypresian Allenby Formations One Mile Creek outcrop north of Princeton, British Columbia. The one mile creek site is notable for being dominated by fossils of '' Betula leopoldae'' though '' Acer'' species, Rosaceae species, '' Tsukada davidiifolia'', and '' Ulmus okanaganensis'' are also present. The Allenby Formation preserves an upland temperate flora which was first interpreted as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klondike Mountain Formation
The Klondike Mountain Formation is an Early Eocene (Ypresian) geological formation located in the northeast central area of Washington state. The formation, named for the type location designated in 1962, Klondike Mountain north of Republic, Washington, is composed of volcanic rocks in the upper unit and volcanics plus lacustrine (lakebed) sedimentation in which a lagerstätte with exceptionally well-preserved plant and insect fossils has been found, along with fossil epithermal hot springs. The formation is the youngest in a group of formations which belong to the Challis Sequence rocks. The formation unconformably overlies rocks of the Eocene Sanpoil Volcanics and much older Triassic and Permian formations. The formation is bounded on its edges by a series of high-angle strike slip faults, which have contained the Klondike Mountain Formation in a series of graben structures, such as the Republic Graben. Public access to a fossiliferous outcrop at the north end of Republic is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allenby Formation
The Allenby formation is a sedimentary rock formation in British Columbia which was deposited during the Ypresian stage of the Early Eocene. It consists of conglomerates, sandstones with interbedded shales and coal. The shales contain an abundance of insect, fish and plant fossils known from 1877 and onward, while the Princeton Chert was first indented in the 1950's and is known from anatomically preserved plants. There are several notable fossil producing localities in the Princeton & Tulameen basins. Historical collection sites included Nine Mile Creek, Vermilian Bluffs, and Whipsaw Creek, while modern sites include One Mile Creek, Pleasant Valley, Thomas Ranch, and the Princeton Chert. Extent and correlation The Allenby is estimated to have an overall extent of approximately , though actual outcroppings of the formation make up less than 1% of the formation, while other exploratory contact is via boreholes and mines. The half-graben which contains the formation is s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochodendron
''Trochodendron'' is a genus of flowering plants with one living species, ''Trochodendron aralioides'', and six extinct species known from the fossil record. It was often considered the sole genus in the family Trochodendraceae, though botanists now also include the distinct genus '' Tetracentron'' in the family. Species * ''Trochodendron aralioides'' *†'' Trochodendron beckii'' *†'' Trochodendron drachukii'' (Infructescence; Ypresian, McAbee Fossil Beds, British Columbia) *†'' Trochodendron evenense'' (Leaves; Miocene, Kamchatka) *†'' Trochodendron infernense'' (Infructescence; Late Palaeocene, Fort Union Formation) *†'' Trochodendron kamtschaticum'' (Infructescence; Miocene, Kamchatka) *†''Trochodendron nastae'' (Leaves; Ypresian, Klondike Mountain Formation, Washington state) *†'' Trochodendron postnastae'' (Leaves; Langhian, Moose Mountain Flora, Oregon) *†'' Trochodendron protoaralioides'' (Leaves; late Miocene, Japan) *†'' Trochodendron rosayi'' (Infructe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., it borders the Canadian province of British Columbia and the Yukon territory to the east; it also shares a maritime border with the Russian Federation's Chukotka Autonomous Okrug to the west, just across the Bering Strait. To the north are the Chukchi and Beaufort Seas of the Arctic Ocean, while the Pacific Ocean lies to the south and southwest. Alaska is by far the largest U.S. state by area, comprising more total area than the next three largest states (Texas, California, and Montana) combined. It represents the seventh-largest subnational division in the world. It is the third-least populous and the most sparsely populated state, but by far the continent's most populous territory located mostly north of the 60th parallel, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
