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Ornithostaphylos
''Ornithostaphylos'' is a monotypic plant genus which contains the single species ''Ornithostaphylos oppositifolia'', commonly known as the Baja California birdbush or Baja California manzanita. A large, evergreen shrub in the heather family, this species is near-endemic to northwestern Baja California, with a small population just north of the border in San Ysidro, California. It produces a much-branched inflorescence of white, urn-shaped flowers, and has leathery leaves that appear opposite or in whorls. These unique characteristics separate it from its close relatives in the region, which include manzanitas (Arctostaphylos), summer holly (Comarostaphylis) and mission manzanita ( Xylococcus). Description A burl-forming, branched shrub to small tree up to 2 m tall, this species has thin, smooth bark that is colored reddish purple when young, sometimes found peeling off. The erect, rigidly branched stems may have minutely wooly hairs. The evergreen, leathery leaves are arranged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xylococcus Bicolor
''Xylococcus'' is a Monotypic taxon, monotypic genus of flowering plants in the Ericaceae, heather family which contains the single species ''Xylococcus bicolor'', commonly known as the mission manzanita. It is a Lignotuber, burl-forming, evergreen shrub to tree with leathery leaves and smooth dark reddish bark. From December to February, white to pink urn-shaped flowers adorn the foliage, often attracting hummingbird pollinators. It is native to southern California and the Baja California Peninsula, south to the Sierra de la Giganta. There is growing concern over the future of this plant, referred to as the "queen of the Dwarf forest, elfin forest, " as it may possibly lose up to 88% of its habitat and its wild seedlings are failing to survive more than a full year.Gordon, L., R. W. Halsey, J. E. Keeley, J. P. Rebman, D. Wiens and A. Johanson. (2015) Mission manzanita, queen of the elfin forest: is the species in decline? ''Fremontia'' 43(2), 23-28. Known to and utilized by the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Kunkel Small
John Kunkel Small (January 31, 1869 – January 20, 1938) was an American botanist. Born on January 31, 1869, in Harrisburg Pennsylvania, Kunkel studied botany at Franklin & Marshall College and Columbia University. He was the first Curator of Museums at The New York Botanical Garden, a post in which he served from 1898 until 1906. From 1906 to 1934 he was Head Curator and then from 1934 until his death he was Chief Research Associate and Curator. Small's doctoral dissertation, published as '' Flora of the Southeastern United States'' in 1903, anrevised in 1913and 1933, remains the best floristic reference for much of the South. Assisted by the patronage of Charles Deering, Small traveled extensively around Florida recording plants and land formations. Small was an early botanist explorer of Florida, documenting many things for the first time, although the flora and fauna were well known to the local Seminole Indians. His first trip to the region was in 1901. Over the next 37 y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stamen
The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filament and an anther which contains ''sporangium, microsporangia''. Most commonly anthers are two-lobed and are attached to the filament either at the base or in the middle area of the anther. The sterile tissue between the lobes is called the connective, an extension of the filament containing conducting strands. It can be seen as an extension on the dorsal side of the anther. A pollen grain develops from a microspore in the microsporangium and contains the male gametophyte. The stamens in a flower are collectively called the androecium. The androecium can consist of as few as one-half stamen (i.e. a single locule) as in ''Canna (plant), Canna'' species or as many as 3,482 stamens which have been counted in the saguaro (''Carnegiea gigantea'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drought Tolerance
Drought tolerance is the ability to which a plant maintains its biomass production during arid or drought conditions. Some plants are naturally adapted to dry conditions'','' surviving with protection mechanisms such as desiccation tolerance, detoxification, or repair of xylem embolism. Other plants, specifically crops like corn, wheat, and rice, have become increasingly tolerant to drought with new varieties created via genetic engineering. The plants behind drought tolerance are complex and involve many pathways which allows plants to respond to specific sets of conditions at any given time. Some of these interactions include stomatal conductance, carotenoid degradation and anthocyanin accumulation, the intervention of osmoprotectants (such as sucrose, glycine, and proline), ROS-scavenging enzymes. The molecular control of drought tolerance is also very complex and is influenced other factors such as environment and the developmental stage of the plant. This control consists ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Secure Fence Act Of 2006
The Secure Fence Act of 2006 (), also labelled H.R. 6061, is an act of the United States Congress which authorized and partially funded the construction of 700 miles (1,125 km) of fencing along the Mexican border. The Act was signed into law on October 26, 2006, by U.S. President George W. Bush, who stated at the time that the Act would "help protect the American people", would "make our borders more secure", and was "an important step toward immigration reform". Background The fencing built under the 2006 act was not the first border fencing in the United States. The U.S. Border Patrol first began to erect physical barriers in its San Diego sector in 1990. Fourteen miles of fencing were erected along the border of San Diego, California, and Tijuana, Mexico. Passage and provisions The Secure Fence Act (Bill H.R. 6061) was introduced in the House of Representatives on September 13, 2006, by Congressman Peter T. King, Republican of New York. The Act passed the House by a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Border Patrol
The United States Border Patrol (USBP) is a Federal law enforcement in the United States, federal law enforcement agency under the United States' U.S. Customs and Border Protection, Customs and Border Protection and is responsible for securing the borders of the United States. According to its web site in 2022, its mission is to "Protect the American people, safeguard our borders, and enhance the nation’s economic prosperity." With 19,648 agents in 2019, the Border Patrol is one of the largest law enforcement agencies in the United States. For fiscal year 2017, Congress enacted a budget of $3,805,253,000 for the Border Patrol. There have been repeated complaints, over many years, of Border Patrol agents mistreating migrants and exceeding their legal authority. Only in late 2021, after public criticism, did the Border Patrol outfit agents with body cameras, which it had rejected in 2015 as too expensive, bad for agent morale, and unreliable; it had previously required state and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat Fragmentation
Habitat fragmentation describes the emergence of discontinuities (fragmentation) in an organism's preferred environment (habitat), causing population fragmentation and ecosystem decay. Causes of habitat fragmentation include geological processes that slowly alter the layout of the physical environment (suspected of being one of the major causes of speciation), and human activity such as land conversion, which can alter the environment much faster and causes the extinction of many species. More specifically, habitat fragmentation is a process by which large and contiguous habitats get divided into smaller, isolated patches of habitats. Definition The term habitat fragmentation includes five discrete phenomena: * Reduction in the total area of the habitat * Decrease of the interior: edge ratio * Isolation of one habitat fragment from other areas of habitat * Breaking up of one patch of habitat into several smaller patches * Decrease in the average size of each patch of habitat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaparral
Chaparral ( ) is a shrubland plant community and geographical feature found primarily in the U.S. state of California, in southern Oregon, and in the northern portion of the Baja California Peninsula in Mexico. It is shaped by a Mediterranean climate (mild wet winters and hot dry summers) and infrequent, high-intensity crown fires. Chaparral features summer-drought-tolerant plants with hard sclerophyllous evergreen leaves, as contrasted with the associated soft-leaved, drought-deciduous, scrub community of coastal sage scrub, found often on drier, southern facing slopes within the chaparral biome. Three other closely related chaparral shrubland systems occur in central Arizona, western Texas, and along the eastern side of central Mexico's mountain chains (mexical), all having summer rains in contrast to the Mediterranean climate of other chaparral formations. Chaparral comprises 9% of California's wildland vegetation and contains 20% of its plant species. The name comes from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexico–United States Border
The Mexico–United States border ( es, frontera Estados Unidos–México) is an international border separating Mexico and the United States, extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border traverses a variety of terrains, ranging from urban areas to deserts. The Mexico–United States border is the most frequently crossed border in the world, with approximately 350 million documented crossings annually. It is the tenth-longest border between two countries in the world. The total length of the continental border is . From the Gulf of Mexico, it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at Ciudad Juárez, Chihuahua, and El Paso, Texas. Westward from El Paso–Juárez, it crosses vast tracts of the Chihuahuan and Sonoran deserts to the Colorado River Delta and San Diego–Tijuana, before reaching the Pacific Ocean. Four American states border Mexico: California, Arizona, New Mexico, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sierra De San Pedro Mártir
Sierra de San Pedro Mártir ( Kiliwa: ʔxaal haq, en, mountains of Saint Peter the Martyr) is a mountain range located within southern Ensenada Municipality and southern Baja California state, of northwestern Mexico. It is a major mountain range in the long Peninsular Ranges System, that extends from Southern California down the Baja California Peninsula into Baja California Sur state. Geography The range's highest peak is Picacho del Diablo at in elevation. Also known as ''Cerro de la Encantada'' (Enchanted Mountain) and ''Picacho la Providencia'' (Providence Peak), it is the highest point in Baja California state and of the entire Baja California Peninsula. The range is a drainage divide that demarcates the drainages flowing west into the Pacific Ocean or east into the Gulf of California for this section of the Baja California Peninsula. Snow is usually present at the highest elevations in the winter. The Sierra de Juárez are on the north, and Sierra de San Francisco are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tijuana
Tijuana ( ,"Tijuana" (US) and ), known also by the initials T.J., is a city and municipal seat of , , located on the . It is part of the San Diego-Tijuana metro area and the larger [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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