|
Citrus Taxonomy
Citrus taxonomy is the botanical classification of the species, varieties, cultivars, and graft hybrids within the genus ''Citrus'' and related genera, found in cultivation and in the wild. Citrus taxonomy is complex and controversial. Cultivated citrus are derived from various citrus species found in the wild. Some are only selections of the original wild types, many others are hybrids between two or more original species, and some are backcrossed hybrids between a hybrid and one of the hybrid's parent species. Citrus plants hybridize easily between species with completely different morphologies, and similar-looking citrus fruits may have quite different ancestries. Some differ only in disease resistance. Conversely, different-looking varieties may be nearly genetically identical, and differ only by a bud mutation. Genomic analysis of wild and domesticated citrus cultivars has suggested that the progenitor of modern citrus species expanded out of the Himalayan foothills in a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nucellar
In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the ''integument'', forming its outer layer, the ''nucellus'' (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center. The female gametophyte — specifically termed a ''megagametophyte'' — is also called the ''embryo sac'' in angiosperms. The megagametophyte produces an egg cell for the purpose of fertilization. The ovule is a small structure present in the ovary. It is attached to the placenta by a stalk called a funicle. The funicle provides nourishment to the ovule. On the basis of the relative position of micropyle, body of the ovule, chalaza and funicle, there are six types of ovules. Location within the plant In flowering plants, the ovule is located inside the portion of the flower called the gynoecium. The ovary of the gynoecium produces one or more ovules and ultimately becomes t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallace Line
The Wallace Line or Wallace's Line is a faunal boundary line drawn in 1859 by the British naturalist Alfred Russel Wallace and named by the English biologist Thomas Henry Huxley. It separates the biogeographic realms of Asia and 'Wallacea', a transitional zone between Asia and Australia (continent), Australia formerly also called the Malay Archipelago and the Indo-Australian Archipelago (Present day Indonesia). To the west of the line are found organisms related to Asiatic species; to the east, a mixture of species of Asian and Australian origins is present. Wallace noticed this clear division in both land mammals and birds during his travels through the East Indies in the 19th century. The line runs through Indonesia, such as Makassar Strait between Borneo and Sulawesi (Celebes), and through the Lombok Strait between Bali and Lombok, where the distance is strikingly small, only about 35 kilometers (22 mi), but enough for a contrast in species present on each isl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monsoon
A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annual latitudinal oscillation of the Intertropical Convergence Zone (ITCZ) between its limits to the north and south of the equator. Usually, the term monsoon is used to refer to the Wet season, rainy phase of a seasonally changing pattern, although technically there is also a dry phase. The term is also sometimes used to describe locally heavy but short-term rains. The major monsoon systems of the world consist of the Monsoon#Africa (West African and Southeast African), West African, Asian–Australian monsoon, Australian, the North American monsoon, North American, and South American monsoons. The term was first Glossary of the British Raj, used in English in British India and neighboring countries to refer to the big seasonal winds blowin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citrus Linczangensis
''Citrus'' is a genus of flowering trees and shrubs in the family Rutaceae. Plants in the genus produce citrus fruits, including important crops such as oranges, mandarins, lemons, grapefruits, pomelos, and limes. ''Citrus'' is native to South Asia, East Asia, Southeast Asia, Melanesia, and Australia. Indigenous people in these areas have used and domesticated various species since ancient times. Its cultivation first spread into Micronesia and Polynesia through the Austronesian expansion (–1500 BCE). Later, it was spread to the Middle East and the Mediterranean () via the incense trade route, and from Europe to the Americas. Renowned for their highly fragrant aromas and complex flavor, citrus are among the most popular fruits in cultivation. With a propensity to hybridize between species, making their taxonomy complicated, there are numerous varieties encompassing a wide range of appearance and fruit flavors. Evolution Evolutionary history The large citrus fruit of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene followed the Oligocene and preceded the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by distinct global events but by regionally defined transitions from the warmer Oligocene to the cooler Pliocene Epoch. During the Early Miocene, Afro-Arabia collided with Eurasia, severing the connection between the Mediterranean and Indian Oceans, and allowing the interchange of fauna between Eurasia and Africa, including the dispersal of proboscideans and Ape, hominoids into Eurasia. During the late Miocene, the conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mangshanyegan
''Citrus mangshanensis'', the mangshanyegan (), is a wild citrus fruit species. The mangshanyegan is native to mountain forests in Mangshan, Hunan province, China, where it was first reported in the 1980s. It is genetically distinct from the mandarin orange, with which it has morphological similarities, and the term 'Mangshan wild mandarins' as well as the species name ''C. mangshanensis'' have been used both for the mangshanyegan and for wild true mandarins of the same region. Genomic sequencing shows the mangshanyegan to be one of a small number of pure (non-hybrid) citrus species, having diverged from other members of the genus at the initial branching of ''Citrus'' radiation in the Late Miocene. It is genetically similar to another wild citrus of the region, the ''yuanju''. Taxonomy and genetic distinction ''Citrus mangshanensis'' is genetically distinct from the mandarin orange (''Citrus reticulata''), despite some morphological similarities. Genomic studies confirm tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micrantha (citrus)
The micrantha is a wild citrus from the papeda group, native to southern Philippines, particularly islands of Cebu and Bohol. Two varieties are recognized: small-flowered papeda (''C. hystrix'' var. ''micrantha''), locally known as ''biasong'', and small-fruited papeda (''C. hystrix'' var. ''microcarpa'') or ''samuyao''. Although long viewed as a separate species, ''C. micrantha'', it is now generally viewed to fall within '' Citrus hystrix'', but genomic data on the latter is insufficient for a definitive conclusion. A micrantha was one of the progenitor species of some varieties of lime. Description The micrantha was first described to Western science in 1915 by Peter Jansen Wester, who worked for the Philippine Bureau of Agriculture at the time. Biasong Wester collected ripe fruit specimens of biasong (small-flowered papeda, ''Citrus hystrix'' var. ''micrantha'') on islands of Cebu, Bohol, Dumaguete, Negros, and in the Zamboanga and Misamis provinces in M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kumquat
Kumquats ( ), or cumquats in Australian English, are a group of small, angiosperm, fruit-bearing trees in the family Rutaceae. Their taxonomy is disputed. They were previously classified as forming the now-historical genus ''Fortunella'' or placed within ''Citrus'', . Different classifications have alternatively assigned them to anywhere from a single species, ''Citrus japonica'', to numerous species representing each cultivar. Recent genomic analysis defines three pure species, ''Citrus hindsii'', ''Citrus margarita, C. margarita'' and ''Citrus crassifolia, C. crassifolia'', with ''C.'' × ''japonica'' being a Hybrid (biology), hybrid of the last two. The edible fruit closely resembles the Orange (fruit), orange (''Citrus x sinensis'') in color, texture, and anatomy, but is much smaller, being approximately the size of a large olive. The kumquat is a fairly cold-hardy citrus. Etymology The English word ''kumquat'' is a borrowing of the Cantonese (; zh, c=金橘), from "gol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Round Lime
''Citrus australis'', the Dooja, round lime, Australian lime or Australian round lime, is a large shrub or small tree producing an edible fruit. It grows in forest margins in the Beenleigh area and northwards, in Queensland, Australia. ''Citrus australis'' is a tree up to tall. Fruits are spherical or slightly pear-shaped, across, with a thick green or yellow skin and pale green pulp. The 1889 book ''The Useful Native Plants of Australia'' records that "The fruit, which is an inch and a-half in diameter and almost globular, yields an agreeable beverage from its acid juice." Taxonomy A member of the Rutaceae family, ''Citrus australis'' is also known as the Australian round lime, Australia sweet, dooja, Gympie lime, native lime, native orange, or the round lime. It is one of the three main types of indigenous limes that can be found in Australia, along with the Australian finger lime (''Citrus australasica'') and the Australian desert lime ('' Citrus glauca''). The citru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finger Lime
''Citrus australasica'', the finger lime or caviar lime, is a thorny understorey shrub or small tree of lowland subtropical rainforest in the coastal border region of Queensland and New South Wales, Australia. It has edible fruits which are grown as a commercial crop. Description ''Citrus australasica'' is a shrub or small tree to about tall with sharp spines up to long in the . The leaves are light green in colour, obovate or rhombic in shape, and arranged alternately along the twigs. They measure up to wide and long, but may reach long, and they may be faintly (scalloped) towards the apex. Like many other plants in the genus, the leaves contain numerous oil glands and are aromatic when crushed. The flowers are either solitary or paired and are set on peduncles about long. The sepals are tiny, about long, the white petals are up to long. Stamens number between 20 and 25. The fruit is a botanical berry, cylindrical and tapered at both ends, slightly curved and abo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Lime
''Citrus glauca'', commonly known as the desert lime, is a thorny shrub or small tree native to Queensland, New South Wales, and South Australia.Burkill, Isaac Henry. 1932. Gardens' Bulletin, Straits Settlements 5 (Index): 3. ''Citrus glauca''.Citrus pages, Native Australian Citrus, ''Citrus glauca'' The 1889 book ''The Useful Native Plants of Australia'' records the common names native kumquat and desert lemon. Taxonomy Under the Swingle system, the desert lime was classified in the genus ''Eremocitrus'', a close relative of the genus '' |
