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Picea × Lutzii
''Picea'' × ''lutzii'' is a hybrid spruce tree that is a natural cross between white spruce and Sitka spruce occurring where the ranges of the two species overlap in coastal south-central Alaska and coastal British Columbia. Its common name is Lutz spruce. Its morphology is intermediate between the two parent species, the maritime Sitka spruce and the white spruce of dryer climates further inland. In addition to the parent spruces it shares its ecosystem with ''Tsuga heterophylla'' and '' T. mertensiana''. The tree was named for Harold John Lutz, a scientist who specialized in forest soils and worked briefly for the United States Forest Service in Alaska where he collected the material used to describe the hybrid. A Lutz spruce from Alaska's Chugach National Forest was selected in 2015 for the Capitol Christmas Tree. This is the first Capitol Tree that has come from the state of Alaska. Lutz's spruce grows as tall as 30 meters in height, and it is a generally symmetrical tree wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elbert Luther Little
Elbert Luther Little, Jr. (born October 15, 1907, in Fort Smith, Arkansas; died June 23, 2004) was an American botanist whose career spanned 70 years and largely concerned forest botany. Although he was born in Arkansas, and died in Oregon, he grew up in Muskogee, Oklahoma from the age of two and spent much of his life in Arlington, Virginia. Little served as Chief Dendrologist for the United States Forest Service from 1967 to 1975 and was the author of the National Audubon Society The National Audubon Society (Audubon; ) is an American non-profit environmental organization dedicated to conservation of birds and their habitats. Located in the United States and incorporated in 1905, Audubon is one of the oldest of such organ ...'s ''Field Guide to Trees'' (1980). In life he was honored by the Oklahoma Forestry Association and the Oklahoma Academy of Science. References People from Fort Smith, Arkansas People from Muskogee, Oklahoma 1907 births 2004 deaths American ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capitol Christmas Tree
The Capitol Christmas Tree (formerly the Capitol Holiday Tree) is the decorated tree that is erected annually on the West Front Lawn of the United States Capitol, in Washington, D.C., to celebrate the Christmas holiday season. The selection, installation, and decoration of the tree are all overseen by the Superintendent of the Capitol Grounds of the Architect of the Capitol (AOC). The tree is traditionally lit by the Speaker of the United States House of Representatives, joined by a essay contest winner during a ceremony at the beginning of December, and remains lit each night through New Year's Day. By tradition, the President and Vice President of the United States will not attend the tree lighting ceremony. History Records of the AOC indicate that a Christmas Tree was purchased in 1919; however, it was not until 1964, one year after the suggestion of John W. McCormack, the 53rd Speaker of the House, that a procedure was established for the installation of a yearly tree. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora Of Alaska
Flora is all the plant life present in a particular region or time, generally the naturally occurring (indigenous) native plants. Sometimes bacteria and fungi are also referred to as flora, as in the terms ''gut flora'' or ''skin flora''. Etymology The word "flora" comes from the Latin name of Flora, the goddess of plants, flowers, and fertility in Roman mythology. The technical term "flora" is then derived from a metonymy of this goddess at the end of the sixteenth century. It was first used in poetry to denote the natural vegetation of an area, but soon also assumed the meaning of a work cataloguing such vegetation. Moreover, "Flora" was used to refer to the flowers of an artificial garden in the seventeenth century. The distinction between vegetation (the general appearance of a community) and flora (the taxonomic composition of a community) was first made by Jules Thurmann (1849). Prior to this, the two terms were used indiscriminately.Thurmann, J. (1849). ''Essai de Phyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid Plants
Hybrid may refer to: Science * Hybrid (biology), an offspring resulting from cross-breeding ** Hybrid grape, grape varieties produced by cross-breeding two ''Vitis'' species ** Hybridity, the property of a hybrid plant which is a union of two different genetic parent strains * Hybrid (particle physics), a valence quark-antiquark pair and one or more gluons * Hybrid solar eclipse, a rare solar eclipse type Technology Transportation * Hybrid vehicle, a vehicle using more than one power source or an engine sourced from a different chassis ** Hybrid electric vehicle, a vehicle using both internal combustion and electric power sources *** Plug-in hybrid, whose battery can be recharged by a charging cable * Hybrid bicycle, a bicycle with features of road and mountain bikes * Hybrid train, a locomotive, railcar, or train that uses an onboard rechargeable energy storage system * Hybrid motorcycle, a motorcycle built using components from more than one original-manufacturer products, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Picea
A spruce is a tree of the genus ''Picea'' (), a genus of about 35 species of coniferous evergreen trees in the family Pinaceae, found in the northern temperate and boreal (taiga) regions of the Earth. ''Picea'' is the sole genus in the subfamily Piceoideae. Spruces are large trees, from about 20 to 60 m (about 60–200 ft) tall when mature, and have whorled branches and conical form. They can be distinguished from other members of the pine family by their needles (leaves), which are four-sided and attached singly to small persistent peg-like structures (pulvini or sterigmata) on the branches, and by their cones (without any protruding bracts), which hang downwards after they are pollinated. The needles are shed when 4–10 years old, leaving the branches rough with the retained pegs. In other similar genera, the branches are fairly smooth. Spruce are used as food plants by the larvae of some Lepidoptera (moth and butterfly) species, such as the eastern spruce budwo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ResearchGate
ResearchGate is a European commercial social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators. According to a 2014 study by ''Nature'' and a 2016 article in ''Times Higher Education'', it is the largest academic social network in terms of active users, although other services have more registered users, and a 2015–2016 survey suggests that almost as many academics have Google Scholar profiles. While reading articles does not require registration, people who wish to become site members need to have an email address at a recognized institution or to be manually confirmed as a published researcher in order to sign up for an account. Members of the site each have a user profile and can upload research output including papers, data, chapters, negative results, patents, research proposals, methods, presentations, and software source code. Users may also follow the activities of other users and engage in discussions with th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Picea Mariana
''Picea mariana'', the black spruce, is a North American species of spruce tree in the pine family. It is widespread across Canada, found in all 10 provinces and all 3 territories. It is the official tree of the province of Newfoundland and Labrador and is that province's most numerous tree. The range of the black spruce extends into northern parts of the United States: in Alaska, the Great Lakes region, and the upper Northeast. It is a frequent part of the biome known as taiga or boreal forest.. The Latin specific epithet ''mariana'' means “of the Virgin Mary”. Description ''P. mariana'' is a slow-growing, small upright evergreen coniferous tree (rarely a shrub), having a straight trunk with little taper, a scruffy habit, and a narrow, pointed crown of short, compact, drooping branches with upturned tips. Through much of its range it averages tall with a trunk diameter at maturity, though occasional specimens can reach tall and diameter. The bark is thin, scaly, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eric Chivian
Eric S. Chivian is the founder and director of the Center for Health and the Global Environment (CHGE) at Harvard Medical School, where he is also an assistant clinical professor of psychiatry. Life and career A 1964 graduate of Harvard University (AB, biochemistry), he went on to graduate from Harvard Medical School in 1968. Between 1980 and 2000, Chivian was a staff psychiatrist in the MIT Medical Department. Chivian was the co-founder (with professors Bernard Lown, Herbert L. Abrams, and James E. Muller), treasurer, and member of the board of directors of the organization International Physicians for the Prevention of Nuclear War, which won the Nobel Peace Prize in 1985 for its efforts to highlight the implications of nuclear conflict for global health. In the mid-1980s, he directed the first scientific survey (under the auspices of the American Academy of Arts and Sciences and the MIT Center for International Studies) of American and Soviet teenagers' attitudes about the pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendroctonus Rufipennis
''Dendroctonus rufipennis'', the spruce beetle, is a species of bark beetle native to British Columbia, Newfoundland and Labrador, Nova Scotia, Ontario, Quebec, Northern Manitoba, the Yukon, Colorado, Wyoming, Montana, and Maine. They are known to destroy forests of spruce trees including Engelmann, White, Sitka, and Colorado blue spruce. Adults average 4 to 7 mm in length. Life cycle The spruce beetle ''Dendroctonus rufipennis'' Kirby (formerly ''D. obesus'' Mannerheim ( ''D. engelmanni'' Hopk.), about 6 mm long, is one of the larger bark beetles found in spruce (Rose and Lindquist 1985).Rose, A.H.; Lindquist, O.H. 1985. Insects of eastern spruces, fir and, hemlock, revised edition. Gov’t Can., Can. For. Serv., Ottawa, For. Tech. Rep. 23. 159 p. (cited in Coates et al. 1994, cited orig ed 1977) White spruce and Engelmann spruce are the principal hosts (Wygant and Lejeune 1967).Wygant, N.D.; Lejeune, R.R. 1967. Engelmann spruce beetle ''Dendroctonus obesus'' (Mann.) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chugach National Forest
The Chugach National Forest is a United States National Forest in south central Alaska. Covering portions of Prince William Sound, the Kenai Peninsula and the Copper River Delta, it was formed in 1907 from part of a larger forest reserve. The Chugach includes extensive shorelines, glaciers, forests and rivers, much of which is untouched by roads or trails. It hosts numerous bird, mammal and marine species, including extensive shorebird habitat and a bald eagle population larger than the contiguous 48 states combined. Human industry in the forest includes extensive tourism and some mining and oil and gas operations. History The area that is now Chugach was settled by the Alutiiq thousands of years ago. It was first visited by Europeans in the mid-1700s and soon settled by Russian fur traders, who trapped the native sea otters. In 1867, the US purchased Alaska from Russia and gold was found in 1888. In 1907, the Chugach National Forest was created from a portion of forest rese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spruce
A spruce is a tree of the genus ''Picea'' (), a genus of about 35 species of coniferous evergreen trees in the family Pinaceae, found in the northern temperate and boreal (taiga) regions of the Earth. ''Picea'' is the sole genus in the subfamily Piceoideae. Spruces are large trees, from about 20 to 60 m (about 60–200 ft) tall when mature, and have whorled branches and conical form. They can be distinguished from other members of the pine family by their needles (leaves), which are four-sided and attached singly to small persistent peg-like structures (pulvini or sterigmata) on the branches, and by their cones (without any protruding bracts), which hang downwards after they are pollinated. The needles are shed when 4–10 years old, leaving the branches rough with the retained pegs. In other similar genera, the branches are fairly smooth. Spruce are used as food plants by the larvae of some Lepidoptera (moth and butterfly) species, such as the eastern spruce budwo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Forest Service
The United States Forest Service (USFS) is an agency of the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands. The Forest Service manages of land. Major divisions of the agency include the Chief's Office, National Forest System, State and Private Forestry, Business Operations, and Research and Development. The agency manages about 25% of federal lands and is the only major national land management agency not part of the U.S. Department of the Interior, which manages the National Park Service, the U.S. Fish and Wildlife Service, and the Bureau of Land Management. History The concept of national forests was born from Theodore Roosevelt's conservation group, Boone and Crockett Club, due to concerns regarding Yellowstone National Park beginning as early as 1875. In 1876, Congress formed the office of Special Agent in the Department of Agriculture to assess the quality and conditions of forests in the United States. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
