the avocado (persea americana) is a medium-sized, evergreen tree in the laurel family (lauraceae).it is native to the americas and was first domesticated by mesoamerican tribes more than 5,000 years ago.then as now it was prized for its large and unusually oily fruit.the tree likely originated in the highlands bridging south-central mexico and guatemala.its fruit, sometimes also referred to as an alligator pear or avocado pear, is botanically a large berry containing a single large seed.avocado trees are partly self-pollinating, and are often propagated through grafting to maintain consistent fruit output.avocados are presently cultivated in the tropical and mediterranean climates of many countries.mexico is the world's leading producer of avocados as of 2020, supplying nearly 30% of the global harvest in that year.the fruit of domestic varieties have smooth, buttery, golden-green flesh when ripe.depending on the cultivar, avocados have green, brown, purplish, or black skin, and may be pear-shaped, egg-shaped, or spherical.for commercial purposes the fruits are picked while unripe and ripened after harvesting.the nutrient density and extremely high fat content of avocado flesh are useful to a variety of cuisines and are often eaten to enrich vegetarian diets.in major production regions like chile, mexico and california the water demands of avocado farms place strain on local sources.avocado production is also implicated in other externalities, including deforestation and human rights concerns associated with the partial control of their production in mexico by organized crime.global warming is expected to result in significant changes to the suitable growing zones for avocados, and place additional pressures on the locales in which they are produced due to heat waves and drought.the leaves are  7.62–25 cm (3–10 in) long and alternately arranged.the tree flowers thousands of blossoms every year.avocado blossoms sprout from racemes near the leaf axils; they are small and inconspicuous 5–10 mm (3⁄16–3⁄8 in) wide.they have no petals but instead 2 whorls of 3 pale-green or greenish-yellow downy perianth lobes, each blossom has 9 stamens with 2 basal orange nectar glands.the pear-shaped fruit is usually 7–20 cm (3–8 in) long, weighs between 100 and 1,000 g (3+1⁄2 and 35+1⁄2 oz), and has a large central seed, 5–6.4 cm (2–2+1⁄2 in) long.the species produces various cultivars with larger, fleshier fruits with a thinner exocarp because of selective breeding by humans.however, there is evidence for three possible separate domestications of the avocado, resulting in the currently recognized mexican (aoacatl), guatemalan (quilaoacatl), and west indian (tlacacolaocatl) landraces.the mexican and guatemalan landraces originated in the highlands of those countries, while the west indian landrace is a lowland variety that ranges from guatemala, costa rica, colombia, ecuador to peru, achieving a wide range through human agency before the arrival of the europeans.the three separate landraces were most likely to have already intermingled in pre-columbian america and were described in the florentine codex.the earliest residents of northern coastal peru were living in temporary camps in an ancient wetland and eating avocados, along with chilies, mollusks, sharks, birds, and sea lions.the oldest discovery of an avocado pit comes from coxcatlan cave, dating from around 9,000 to 10,000 years ago.other caves in the tehuacan valley from around the same time period also show early evidence for the presence and consumption of avocado.there is evidence for avocado use at norte chico civilization sites in peru by at least 3,200 years ago and at caballo muerto in peru from around 3,800 to 4,500 years ago.the native, undomesticated variety is known as a criollo, and is small, with dark black skin, and contains a large seed.
isopachous | bromidically | mephisto <tsp> isopachous | revisable | kinesitherapy
no related information