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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
Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. 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 taxon, extant species in each family is unknown. The Asteraceae were first described in the year 1740 and given the original name Composita, Compositae. The family is commonly known as the aster, Daisy (flower), daisy, composite, or sunflower family. Most species of Asteraceae are herbaceous plants, and may be Annual plant, annual, Biennial plant, biennial, or Perennial plant, perennial, 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 climate, hot desert and cold or hot Semi-arid climate, semi-desert climates, and they are found on ever ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leymus Cinereus
''Leymus cinereus'' is a species of Leymus, wild rye known by the common names basin wild rye, Great Basin wild rye, and Great Basin lyme grass.''Leymus cinereus''. NatureServe. 2012. It is common in western North America. Description ''Leymus cinereus'' is a perennial bunchgrass forming large, tough clumps up to about tall and sometimes exceeding in diameter. It has a large, fibrous root system and sometimes small rhizomes. The inflorescence is an unbranched, cylindrical spike divided into up to 35 nodes with several flower spikelets per node.Distribution and habitat ''Leymus cinereus'' is a common native grass of western North America, including western Canada and the United States from California to Minnesota. It grows in many t ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endangered Plants
In September 2016, the International Union for Conservation of Nature (IUCN) listed 3654 endangered plant species. Of all evaluated plant species, 17% 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 extinction". 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, they are i ... [...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 woodf ... [...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 Common descent, 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 Range (biology), 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 . 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. 2001. ''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 speciation is the evolut ... [...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 Gene flow, exchanging genes, it can often be difficult to distinguish between them, and peripatric speciation may be considered one type or scientific model, model of allopatric speciation. The primary distinguishing characteristic of peripatric speciation is that one of the populations is much smaller than the other, as opposed to (other types of) allopatric speciation, in which similarly-sized populations become separated. 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 di ... [...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 continental drift, 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 Genetics, genetic changes as they become subjected to different Natural selection, selective pressures, experience genetic drift, and accumulate different mutations in the separated populations' gene pools. The barriers prevent t ... [...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 an executive department of the United States federal government that aims to meet the needs of commercial farming and livestock food production, promotes agricultural trade and producti ..., including ''S. runcinata'', ''S. cichoriacea'', a ... [...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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chrysothamnus Viscidiflorus
''Chrysothamnus viscidiflorus'' is an American species of shrub in the family Asteraceae 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. Subspecies and varieties Subspecies and varieties include:Subspecies and varieties recognized bUSDA — ''Chrysothamnus viscidiflorus'' Subordinate Taxa. accessed 5 September 2015Subspecies recognized bCalflora Database for ''Chrysothamnus viscidiflorus''. accessed 5 Septembe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
