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Whitebeam
The whitebeams are members of the family Rosaceae, tribe Malinae, comprising a number of deciduous simple or lobe-leaved species formerly lumped together within ''Sorbus'' s.l. Many whitebeams are the result of extensive intergeneric hybridisation involving the genera ''Sorbus'' (''Sorbus aucuparia'' in particular), ''Aria'', '' Torminalis'' and ''Chamaemespilus''. As an effect, they are commonly apomicts (reproducing solely asexually) and many have very restricted ranges. The best known species is the common whitebeam ('' Aria edulis''), a columnar tree which grows to tall by broad, with clusters of white flowers in spring followed by speckled red berries in autumn (fall). Appearance In many species, the surface of the leaves is an unremarkable mid-green, but the underside is pale to almost white (hence the name) with pale grey or white hairs, transforming the appearance of the tree in strong winds, as noted by the poet Meredith: "flashing as in gusts the sudden-lighted wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aria (plant)
''Aria'' is a genus of plant in the rose family Rosaceae. It includes some of the deciduous species commonly known as whitebeams, and is native to Europe, the north African mountains and western Asia. Via hybridisation with related genera, it is a main contributor to the genesis of a complex of apomicts of intergeneric hybrid origin, which are also commonly referred to as whitebeams. Description Whitebeams of the genus ''Aria'' are small to medium-sized bushes or trees. The leaves are simple and almost white on the underside. The leaf margins are often serrated. While some species such as common whitebeam ('' Aria edulis'') may grow into sizeable trees of up to height, many species (such as rock whitebeam, '' Aria rupicola'') stay bushy. They bear corymbs of white flowers in spring, and the small, colourful pome fruits ripen in late summer. Whitebeam apomicts Hybridisation events between at least one member of genus ''Aria'' and at least one member of at least one differ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sorbus Aria RF
''Sorbus'' is a genus of over 100 species of trees and shrubs in the rose family (biology), family, Rosaceae. Species of ''Sorbus'' (''s.str.'') are commonly known as rowan or Sorbus aucuparia, mountain-ash. The genus used to include species commonly known as whitebeam, Torminalis, chequer tree and Cormus domestica, service tree that are now classified in other genera (see below). The genus ''Sorbus'', as currently circumscribed, includes only the pinnate leaved species of former subgenus ''Sorbus''. ''Sorbus'' is not closely related to the true ash trees which belong to the genus ''Fraxinus'', although the leaves are superficially similar. Genus As treated in its broad sense, the genus was traditionally divided into several subgenera, however, this treatment was found to be Paraphyly, paraphyletic, comprising two disparate lineages within the Malinae subtribe. Consequently, each of the former subgenera have since been elevated into genera in their own right, with the genus name ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sorbus
''Sorbus'' is a genus of over 100 species of trees and shrubs in the rose family, Rosaceae. Species of ''Sorbus'' ('' s.str.'') are commonly known as rowan or mountain-ash. The genus used to include species commonly known as whitebeam, chequer tree and service tree that are now classified in other genera (see below). The genus ''Sorbus'', as currently circumscribed, includes only the pinnate leaved species of former subgenus ''Sorbus''. ''Sorbus'' is not closely related to the true ash trees which belong to the genus '' Fraxinus'', although the leaves are superficially similar. Genus As treated in its broad sense, the genus was traditionally divided into several subgenera, however, this treatment was found to be paraphyletic, comprising two disparate lineages within the Malinae subtribe. Consequently, each of the former subgenera have since been elevated into genera in their own right, with the genus name ''Sorbus'' retained only for the rowans. Additionally, it was recogni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rowan
The rowans ( or ) or mountain-ashes are shrubs or trees in the genus ''Sorbus'' of the rose family, Rosaceae. They are native throughout the cool temperate regions of the Northern Hemisphere, with the highest species diversity in the Himalaya, southern Tibet and parts of western China, where numerous apomictic microspecies occur.Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins . The name ''rowan'' was originally applied to the species ''Sorbus aucuparia'' and is also used for other species in the genus ''Sorbus''. Natural hybrids, often including ''S. aucuparia'' and the whitebeam, '' Aria edulis'' (syn. '' Sorbus aria''), give rise to many endemic variants in the UK. Names The Latin name ''sorbus'' was borrowed into Old English as ''syrfe''. The Latin name ''sorbus'' is from a root for "red, reddish-brown" ( PIE ''*sor-/*ser-''); English ''sorb'' is attested from the 1520s in the sense "fruit of the service tree", adopted via French ''sorbe'' from Latin ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chamaemespilus
''Chamaemespilus'' is a genus of shrubs in the family Rosaceae. It is monotypic, being represented by the single species ''Chamaemespilus alpina'', commonly known as false medlar or dwarf whitebeam. It is native to the mountains of central and southern Europe, from the Pyrenees east through the Alps to the Carpathians and the Balkans, growing at elevations of up to 2500 m.Blamey, M. & Grey-Wilson, C. (1989). ''Flora of Britain and Northern Europe''. Description ''Chamaemespilus alpina'' is a deciduous shrub growing to 2–3 m tall. The leaves are spirally arranged, oval-elliptic, 3–7 cm long, with an acute apex and a serrated margin; they are green on both sides, without the white felting found on most whitebeams. The flowers are pink, with five forward-pointing petals 5–7 mm long; they are produced in corymbs 3–4 cm diameter. The fruit is an oval red pome 10–13 mm diameter.Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins . Taxonomy ''C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alniaria
''Alniaria'' is a genus of flowering plants in the family Rosaceae, native to China, Taiwan, Korea, Japan, and Far Eastern Russia. It was split off from ''Sorbus'' (''sensu lato ''Sensu'' is a Latin word meaning "in the sense of". It is used in a number of fields including biology, geology, linguistics, semiotics, and law. Commonly it refers to how strictly or loosely an expression is used in describing any particular co ...'') in 2018. Species The following species are accepted: *'' Alniaria alnifolia'' (Siebold & Zucc.) Rushforth *'' Alniaria chengii'' (C.J.Qi) Rushforth *'' Alniaria folgneri'' (C.K.Schneid.) Rushforth *'' Alniaria hunanica'' (C.J.Qi) Rushforth *'' Alniaria nubium'' (Hand.-Mazz.) Rushforth *'' Alniaria tsinlingensis'' (C.L.Tang) Rushforth *'' Alniaria yuana'' (Spongberg) Rushforth References Maleae Rosaceae genera Flora of South-Central China Flora of Southeast China Flora of North-Central China Flora of Manchuria Flora of Taiwan Flora of Kore ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malinae
Malinae is the name for the apple subtribe in the rose family, Rosaceae. This name is required by the International Code of Nomenclature for algae, fungi, and plants, which came into force in 2011 (article 19) for any group at the subtribe rank that includes the genus ''Malus'' but not either of the genera ''Rosa'' or ''Amygdalus''. The group includes a number of plants bearing commercially important fruits, such as apples and pears, while others are cultivated as ornamentals. The tribe consists exclusively of shrubs and small trees characterised by a pome, a type of accessory fruit that does not occur in other Rosaceae, and by a basal haploid chromosome A chromosome is a package of DNA containing part or all of the genetic material of an organism. In most chromosomes, the very long thin DNA fibers are coated with nucleosome-forming packaging proteins; in eukaryotic cells, the most import ... count of 17 (instead of 7, 8, 9, or 15 as in the other Rosaceae). There are ap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossary Of Leaf Morphology
The following terms are used to describe leaf plant morphology, morphology in the description and taxonomy (biology), taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflet (botany), leaflets). The edge of the leaf may be regular or irregular, and may be smooth or have hair, bristles, or spines. For more terms describing other aspects of leaves besides their overall morphology see the leaf#Terminology, leaf article. The terms listed here all are supported by technical and professional usage, but they cannot be represented as mandatory or undebatable; readers must use their judgement. Authors often use terms arbitrarily, or coin them to taste, possibly in ignorance of established terms, and it is not always clear whether because of ignorance, or personal preference, or because usages change with time or context, or because of variation between specimens, even specimens from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larva
A larva (; : larvae ) is a distinct juvenile form many animals undergo before metamorphosis into their next life stage. Animals with indirect development such as insects, some arachnids, amphibians, or cnidarians typically have a larval phase of their life cycle. A larva's appearance is generally very different from the adult form (''e.g.'' caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form. Their diet may also be considerably different. In the case of smaller primitive arachnids, the larval stage differs by having three instead of four pairs of legs. Larvae are frequently adapted to different environments than adults. For example, some larvae such as tadpoles live almost exclusively in aquatic environments but can live outside water as adult frogs. By living in a distinct environment, larvae may be given shelter from predators and reduce competition for resources with the adult population. Animals in the lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different varieties, subspecies, species or genera through sexual reproduction. Generally, it means that each cell has genetic material from two different organisms, whereas an individual where some cells are derived from a different organism is called a chimera. Hybrids are not always intermediates between their parents such as in blending inheritance (a now discredited theory in modern genetics by particulate inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridization, which include genetic and morph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyly
A polyphyletic group is an assemblage that includes organisms with mixed evolutionary origin but does not include their most recent common ancestor. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monophyly
In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent common ancestor (or more precisely an ancestral population), i.e. excludes non-descendants of that common ancestor # the grouping contains all the descendants of that common ancestor, without exception Monophyly is contrasted with paraphyly and polyphyly as shown in the second diagram. A ''paraphyletic'' grouping meets 1. but not 2., thus consisting of the descendants of a common ancestor, excepting one or more monophyletic subgroups. A ''polyphyletic'' grouping meets neither criterion, and instead serves to characterize convergent relationships of biological features rather than genetic relationships – for example, night-active primates, fruit trees, or aquatic insects. As such, these characteristic features of a polyphyletic grouping are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
