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Stephanomeria Malheurensis
''Stephanomeria malheurensis'', the Malheur wirelettuce, is a species of flowering plant in the family Asteraceae. It is endemic to Oregon in the United States. It is a federally listed endangered species. It was discovered in 1966 and the population at the type locality in Harney County is the only one ever known. For several years in the 1980s it disappeared. Scattered individuals have been noted over the years. Plants were grown from seed at the Berry Botanic Garden in Portland and planted at the original site. Some still survived as of 2001.''Stephanomeria malheurensis''. Center for Plant Conservation. This species grows atop hills surrounded by flat land. The soils are derived from |
Asteraceae
The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae were first described in the year 1740. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger family is unclear as the quantity of extant species in each family is unknown. Most species of Asteraceae are annual, biennial, or perennial herbaceous plants, but there are also shrubs, vines, and trees. The family has a widespread distribution, from subpolar to tropical regions in a wide variety of habitats. Most occur in hot desert and cold or hot semi-desert climates, and they are found on every continent but Antarctica. The primary common characteristic is the existence of sometimes hundreds of tiny individual florets which are held together by protective involucres in flower heads, or more t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leymus Cinereus
''Leymus'' is a genus of plants in the grass family Poaceae (Gramineae). It is widespread across Europe, Asia, and the Americas. * ''Leymus aemulans'' - Xinjiang, Central Asia * '' Leymus ajanensis'' - Siberia, Russian Far East, Alaska * '' Leymus akmolinensis'' - Siberia, Kazakhstan, European Russia * '' Leymus alaicus'' - Central Asia * '' Leymus altus'' - Xinjiang * '' Leymus ambiguus'' - mountains of western US * '' Leymus angustus'' - Altai wild rye - China, Mongolia, Siberia, Central Asia * '' Leymus arenarius'' - lyme grass - Europe * '' Leymus aristiglumus'' - Qinghai * '' Leymus × buriaticus'' - Siberia * '' Leymus cappadocicus'' - Turkey, Afghanistan * '' Leymus chinensis'' - China, Korea, Mongolia, Amur, Siberia * '' Leymus cinereus'' - basin wild rye - western North America (US + Canada) * '' Leymus condensatus'' - giant wild rye - California, Baja California, Coahuila * '' Leymus crassiusculus'' - Qinghai, Shanxi * '' Leymus divaricatus'' - Kazakhstan * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endangered Plants
As of September 2016, the International Union for Conservation of Nature (IUCN) lists 3654 endangered plant species. 17% of all evaluated plant species are listed as endangered. The IUCN also lists 99 subspecies and 101 varieties as endangered. No subpopulations of plants have been evaluated by the IUCN. For a species to be considered endangered by the IUCN it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of exintction". An even higher risk is faced by ''critically endangered'' species, which meet the quantitative criteria for endangered species. Critically endangered plants are listed separately. There are 6147 plant species which are endangered or critically endangered. Additionally 1674 plant species (7.6% of those evaluated) are listed as ''data deficient'', meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora Of Oregon
This is a list of plants by common name that are native to the U.S. state of Oregon. * Adobe parsley *Alaska blueberry * American wild carrot * Austin's popcornflower * Awned melic * Azalea * Azure penstemon *Baby blue eyes * Baldhip rose * Beach strawberry * Beach wormwood * Bearded lupine * Bensoniella * Bigleaf maple * Bigleaf sedge * Birdnest buckwheat * Birthroot, western trillium * Bitter cherry * Bleeding heart * Blow-wives *Blue elderberry * Bog Labrador tea * Bolander's lily * Bridges' cliffbreak * Brook wakerobin * Brown dogwood *Buckbrush * Bugle hedgenettle * Bunchberry * California broomrape *California buttercup * California canarygrass *California goldfields * California milkwort * California phacelia * California stoneseed * California wild rose * Camas * Canary violet * Canyon gooseberry * Cascara * Castle Lake bedstraw * Charming centaury * Chinese caps * Citrus fawn lily * Coastal cryptantha * Coastal sand-verbena * Coastal sneezeweed *Coastal woodfern * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephanomeria
''Stephanomeria'' is a genus of North American plants also known as wirelettuce, belonging to the tribe Cichorieae within the family Asteraceae.Lee, J., Baldwin, B., and Gottlieb, L.D.; ''Phylogeny of ''Stephanomeria'' and related genera (compositae-lactuceae) bed on analysis of 18S-26S nuclear rDNA ITS and ETS sequences''; American Journal of Botany. 2002; 89:160-168 ''Stephanomeria'' species are used as food plants by the larvae of some Lepidoptera species including '' Schinia scarletina'', which feeds exclusively on the genus. ; Annual species * ''Stephanomeria diegensis'' Gottlieb - San Diego wirelettuce - Baja California, southern California; Hybrid origin: ''S. exigua х S. virgata'' * '' Stephanomeria elata'' Nutt. - Santa Barbara wirelettuce - California and Oregon; 2n=32 * ''Stephanomeria exigua'' Nutt. - small wirelettuce - widespread throughout western United States + Baja California; 2n=16 * '' Stephanomeria hitchcockii'' Gand. - Kansas * ''Stephanomeria malheurensis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sympatric Speciation
Sympatric speciation is the evolution of a new species from a surviving ancestral species while both continue to inhabit the same geographic region. In evolutionary biology and biogeography, sympatric and sympatry are terms referring to organisms whose ranges overlap so that they occur together at least in some places. If these organisms are closely related (e.g. sister species), such a distribution may be the result of sympatric speciation. Etymologically, sympatry is derived from the Greek roots ("together") and ("homeland"). The term was coined by Edward Bagnall Poulton in 1904, who explains the derivation. Sympatric speciation is one of three traditional geographic modes of speciation.Futuyma, D. J. 2009. ''Evolution'' (2nd edition). Sinauer Associates, Inc. Allopatric speciation is the evolution of species caused by the geographic isolation of two or more populations of a species. In this case, divergence is facilitated by the absence of gene flow. Parapatric specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parapatric Speciation
In parapatric speciation, two subpopulations of a species evolve reproductive isolation from one another while continuing to exchange genes. This mode of speciation has three distinguishing characteristics: 1) mating occurs non-randomly, 2) gene flow occurs unequally, and 3) populations exist in either continuous or discontinuous geographic ranges. This distribution pattern may be the result of unequal dispersal, incomplete geographical barriers, or divergent expressions of behavior, among other things. Parapatric speciation predicts that hybrid zones will often exist at the junction between the two populations. In biogeography, the terms parapatric and parapatry are often used to describe the relationship between organisms whose ranges do not significantly overlap but are immediately adjacent to each other; they do not occur together except in a narrow contact zone. Parapatry is a geographical distribution opposed to sympatry (same area) and allopatry or peripatry (two simi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peripatric Speciation
Peripatric speciation is a mode of speciation in which a new species is formed from an isolated peripheral population. Since peripatric speciation resembles allopatric speciation, in that populations are isolated and prevented from exchanging genes, it can often be difficult to distinguish between them. Nevertheless, the primary characteristic of peripatric speciation proposes that one of the populations is much smaller than the other. The terms peripatric and peripatry are often used in biogeography, referring to organisms whose ranges are closely adjacent but do not overlap, being separated where these organisms do not occur—for example on an oceanic island compared to the mainland. Such organisms are usually closely related (''e.g.'' sister species); their distribution being the result of peripatric speciation. The concept of peripatric speciation was first outlined by the evolutionary biologist Ernst Mayr in 1954.Ernst Mayr. (1954). Change of genetic environment and e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allopatric Speciation
Allopatric speciation () – also referred to as geographic speciation, vicariant speciation, or its earlier name the dumbbell model – is a mode of speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow. Various geographic changes can arise such as the movement of continents, and the formation of mountains, islands, bodies of water, or glaciers. Human activity such as agriculture or developments can also change the distribution of species populations. These factors can substantially alter a region's geography, resulting in the separation of a species population into isolated subpopulations. The vicariant populations then undergo genetic changes as they become subjected to different selective pressures, experience genetic drift, and accumulate different mutations in the separated populations' gene pools. The barriers prevent the exchange of genetic information between th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephanomeria Exigua
''Stephanomeria exigua'', the small wirelettuce, is a perennial or biennial plant native to the western United States. It is thought to be the parent species of ''Stephanomeria malheurensis'' (Malheur wirelettuce), an endangered plant species found only in southern Oregon. It generally blooms from mid-spring to late summer and produces small, light pink or light purple blooms. Distribution and range ''Stephanomeria exigua'' is native to the arid regions of Arizona, California, Colorado, Idaho, New Mexico, Nevada, Oregon, Texas, Utah and Wyoming, as well as New York. Related taxa There are 17 related species of ''Stephanomeria'' according to the US Department of Agriculture The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of comm ..., including ''S. runcinata'', ''S. cichoriacea'', and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bromus Tectorum
''Bromus tectorum'', known as downy brome, drooping brome or cheatgrass, is a winter annual grass native to Europe, southwestern Asia, and northern Africa, but has become invasive in many other areas. It now is present in most of Europe, southern Russia, Japan, South Africa, Australia, New Zealand, Iceland, Greenland, North America and western Central Asia. In the eastern US ''B. tectorum'' is common along roadsides and as a crop weed, but usually does not dominate an ecosystem. It has become a dominant species in the Intermountain West and parts of Canada, and displays especially invasive behavior in the sagebrush steppe ecosystems where it has been listed as noxious weed. ''B. tectorum'' often enters the site in an area that has been disturbed, and then quickly expands into the surrounding area through its rapid growth and prolific seed production. The reduction of native plants and the increased fire frequency caused by ''B. tectorum'' prompted the United States Fish and Wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chrysothamnus Viscidiflorus
''Chrysothamnus viscidiflorus'' is a species of shrub in the family Asteraceae of the Americas known by the common names yellow rabbitbrush and green rabbitbrush. Description ''Chrysothamnus viscidiflorus'' grows up to about in height, with spreading, brittle, pale stem branches. The leaves are up to a few centimeters long and may be thin and thread-like or up to 1 cm wide and oblong. They are glandular, resinous, and sticky. The inflorescence is a bushy cluster of flower heads, each head 0.5–1 cm long. The flower head is lined with sticky yellow-green phyllaries and contains several yellowish protruding flowers. The fruit is a hairy achene a few millimeters long with a wispy pappus at the tip. The species grows in sagebrush and woodland habitat. Subspecies and varieties Subspecies and varieties include:Subspecies and varieties recognized bUSDA — ''Chrysothamnus viscidiflorus'' Subordinate Taxa. accessed 5 September 2015Subspecies recognized bCalflora Dat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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