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Daphnopsis Hellerana
''Daphnopsis hellerana'' is a rare species of flowering plant in the genus ''Daphnopsis'' of the family Thymelaeaceae. It is endemic to Puerto Rico, where there were only four populations remaining in 1992, with a total of 125 individuals.USFWSRecovery plan: ''Cornutia obovata'' and ''Daphnopsis hellerana''.August 7, 1992. It was federally listed as an endangered species of the United States in 1988.USFWSDetermination of end. status for plant ''Daphnopsis hellerana''.''Federal Register'' June 23, 1988. This is a shrub or evergreen tree which is limited to limestone substrates on the island of Puerto Rico. It grows in moist forest habitat among almacigo (''Bursera simaruba''), copey (''Clusia rosea''), holywood (''Guaiacum sanctum''), pigeonplum (''Coccoloba diversifolia''), and other plants. This shrub or tree grows to 6 meters in maximum height. The leaves have oval blades up to 13 centimeters long by 6 wide. New leaves are golden in color. Mature leaves are green and hairles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphnopsis
''Daphnopsis'' is a plant genus in the family Thymelaeaceae. There are 50 to 65 species distributed in the Neotropics. They are shrubs and small trees with tubular or bell-shaped flowers. Individuals are dioecious, with male and female flowers produced on separate trees. The Plant List The Plant List. accepts the following species: *'''' Nevling *'' Daphnopsis alpestris'' (Gardner) Benth. & Hook.f. ex B.D.Jacks. *'' Daphnopsis americana'' < ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seedling
A seedling is a young sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (embryonic shoot), and the cotyledons (seed leaves). The two classes of flowering plants (angiosperms) are distinguished by their numbers of seed leaves: monocotyledons (monocots) have one blade-shaped cotyledon, whereas dicotyledons (dicots) possess two round cotyledons. Gymnosperms are more varied. For example, pine seedlings have up to eight cotyledons. The seedlings of some flowering plants have no cotyledons at all. These are said to be acotyledons. The plumule is the part of a seed embryo that develops into the shoot bearing the first true leaves of a plant. In most seeds, for example the sunflower, the plumule is a small conical structure without any leaf structure. Growth of the plumule does not occur until the cotyledons have grown ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecosystem
An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Energy enters the system through photosynthesis and is incorporated into plant tissue. By feeding on plants and on one another, animals play an important role in the movement of matter and energy through the system. They also influence the quantity of plant and microbial biomass present. By breaking down dead organic matter, decomposers release carbon back to the atmosphere and facilitate nutrient cycling by converting nutrients stored in dead biomass back to a form that can be readily used by plants and microbes. Ecosystems are controlled by external and internal factors. External factors such as climate, parent material which forms the soil and topography, control the overall structure of an ecosystem but are not themselves influenced by the ecosystem. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quarry
A quarry is a type of open-pit mine in which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate is excavated from the ground. The operation of quarries is regulated in some jurisdictions to reduce their environmental impact. The word ''quarry'' can also include the underground quarrying for stone, such as Bath stone. Types of rock Types of rock extracted from quarries include: *Chalk *China clay *Cinder *Clay *Coal * Construction aggregate (sand and gravel) * Coquina * Diabase *Gabbro *Granite * Gritstone *Gypsum *Limestone *Marble *Ores *Phosphate rock *Quartz *Sandstone * Slate *Travertine Stone quarry Stone quarry is an outdated term for mining construction rocks (limestone, marble, granite, sandstone, etc.). There are open types (called quarries, or open-pit mines) and closed types ( mines and caves). For thousands of years, only hand tools had been used in quarries. In the 18th century, the use of drilling and blasting operatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charcoal
Charcoal is a lightweight black carbon residue produced by strongly heating wood (or other animal and plant materials) in minimal oxygen to remove all water and volatile constituents. In the traditional version of this pyrolysis process, called charcoal burning, often by forming a charcoal kiln, the heat is supplied by burning part of the starting material itself, with a limited supply of oxygen. The material can also be heated in a closed retort. Modern "charcoal" briquettes used for outdoor cooking may contain many other additives, e.g. coal. This process happens naturally when combustion is incomplete, and is sometimes used in radiocarbon dating. It also happens inadvertently while burning wood, as in a fireplace or wood stove. The visible flame in these is due to combustion of the volatile gases exuded as the wood turns into charcoal. The soot and smoke commonly given off by wood fires result from incomplete combustion of those volatiles. Charcoal burns at a higher temper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yam (vegetable)
Yam is the common name for some plant species in the genus '' Dioscorea'' (family Dioscoreaceae) that form edible tubers. Yams are perennial herbaceous vines cultivated for the consumption of their starchy tubers in many temperate and tropical regions, especially in West Africa, South America and the Caribbean, Asia, and Oceania. The tubers themselves, also called "yams", come in a variety of forms owing to numerous cultivars and related species. Yams were independently domesticated on three different continents: Africa (''Dioscorea rotundata''), Asia (''Dioscorea alata''), and the Americas (''Dioscorea trifida''). Etymology The name "yam" appears to derive from Portuguese ''inhame'' or Canarian (Spain) ''ñame'', which derived from West African languages during trade. However in both languages, this name commonly refers to the taro plant (''Colocasia esculenta'') from the genus ''Colocasia'', as opposed to '' Dioscorea''. The main derivations borrow from verbs me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grazing
In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to roam around and consume wild vegetations in order to convert the otherwise indigestible (by human gut) cellulose within grass and other forages into meat, milk, wool and other animal products, often on land unsuitable for arable farming. Farmers may employ many different strategies of grazing for optimum production: grazing may be continuous, seasonal, or rotational within a grazing period. Longer rotations are found in ley farming, alternating arable and fodder crops; in rest rotation, deferred rotation, and mob grazing, giving grasses a longer time to recover or leaving land fallow. Patch-burn sets up a rotation of fresh grass after burning with two years of rest. Conservation grazing proposes to use grazing animals to improve the biodiversity of a site, but studies show that the greatest benefit to biodiversity comes from removing grazing animals from the landscape. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agriculture
Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities. The history of agriculture began thousands of years ago. After gathering wild grains beginning at least 105,000 years ago, nascent farmers began to plant them around 11,500 years ago. Sheep, goats, pigs and cattle were domesticated over 10,000 years ago. Plants were independently cultivated in at least 11 regions of the world. Industrial agriculture based on large-scale monoculture in the twentieth century came to dominate agricultural output, though about 2 billion people still depended on subsistence agriculture. The major agricultural products can be broadly grouped into foods, fibers, fuels, and raw materials (such as rubber). Food classes include cereals (grains), vegetables, fruits, cooking oils, meat, milk, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornutia Obovata
''Cornutia obovata'' is a rare species of tree in the mint family, and formerly considered a member of the verbena family.Bramley, G., et alNeotropical Lamiaceae.Royal Botanic Gardens, Kew, UK. It is endemic to forested slopes in Puerto Rico, where its common names are ''capá jigüerilla'', ''nigua'', and ''palo de nigua''.World Conservation Monitoring Centre. (1998)''Cornutia obovata'' IUCN Red List of Threatened Species. IUCN 2010www.iucnredlist.org . Retrieved on 19 February 2011. When it was added to the endangered species list of the United States in 1988 there were only seven individuals known to remain in the wild.USFWSDetermination of endangered status for ''Cornutia obovata'' (palo de nigua).''Federal Register'' April 24, 1987. By 1998 there were eight plants known. This is considered one population divided amongst a few locations in the mountain forests of the island. This is an evergreen tree which can reach 10 meters in maximum height and 15 centimeters in trunk di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deforestation
Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated deforestation occurs in tropical rainforests. About 31% of Earth's land surface is covered by forests at present. This is one-third less than the forest cover before the expansion of agriculture, a half of that loss occurring in the last century. Between 15 million to 18 million hectares of forest, an area the size of Bangladesh, are destroyed every year. On average 2,400 trees are cut down each minute. The Food and Agriculture Organization of the United Nations defines deforestation as the conversion of forest to other land uses (regardless of whether it is human-induced). "Deforestation" and "forest area net change" are not the same: the latter is the sum of all forest losses (deforestation) and all forest gains (forest expansion) in a gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isabela, Puerto Rico
Isabela () is a town and municipality of Puerto Rico located in the north-western region of the island, north of San Sebastián; west of Quebradillas; and east of Aguadilla and Moca. It is named in honor of Isabella I of Castile. Isabela is spread over 13 barrios and Isabela Pueblo, which is the downtown area and administrative center. It is a principal part of the Aguadilla-Isabela-San Sebastián Metropolitan Statistical Area. Nicknames The town is known as the ''Jardín del Noroeste'' ("Garden of the Northwest"), because of the many wild flowers in its landscape. It is also known as ''El Pueblo de los Quesitos de Hoja'' ("Town of Leaf Cheeses") for its production of a typical fresh white cheese wrapped in banana plant leaves, reputed to be the best. It is also known as la ''Ciudad de los Gallitos'' or the "City of the Fighting Cocks." Since the 18th century, cock fighting was very common throughout the island, and the town became well known for the quality of its fightin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toa Baja, Puerto Rico
Toa Baja (, ) is a town and municipality of Puerto Rico located in the northern coast, north of Toa Alta and Bayamón; east of Dorado; and west of Cataño. Toa Baja is spread over five barrios, including Toa Baja Pueblo (the downtown area and the administrative center of the city). Toa Baja is part of the San Juan-Caguas-Guaynabo Metropolitan Statistical Area. Toa Baja is located fifteen minutes by car from San Juan and two hours from Ponce. History The region of what is now Toa Baja belonged to the Taíno region of Toa and Bayamón, which was located on the north coast of Puerto Rico. The regions were led by cacique Aramana and Majagua respectively. During the Spanish colonization, a farm was settled in the region around 1511 where Spanish settlers tried to learn from the Taínos how to grow fruits and vegetables. Some of the families who settled in the region were Marrero, Salgado, and Martínez, from the Canary Islands. In 1745, the town was officially organized, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
