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Podocarpaceae
Podocarpaceae is a large family of mainly southern hemisphere conifers, known in English as podocarps, comprising about 156 species of evergreen trees and shrubs.James E. Eckenwalder. 2009. ''Conifers of the World''. Portland, Oregon: Timber Press. . It contains 20 genera if ''Phyllocladus'' is included and ''Manoao'' and ''Sundacarpus'' are recognized. The family achieved its maximum diversity in the Cenozoic, making the Podocarpaceae family one of the most diverse in the southern hemisphere. The family is a classic member of the Antarctic flora, with its main centres of diversity in Australasian realm, Australasia, particularly New Caledonia, Tasmania, and New Zealand, and to a slightly lesser extent Malesia and South America (primarily in the Andes Mountains). Several genera extend north of the equator into Indochina and the Philippines. ''Podocarpus'' reaches as far north as southern Japan and southern China in Asia, and Mexico in the Americas, and ''Nageia'' into southern Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afrocarpus
''Afrocarpus'' is a genus of conifer of the family Podocarpaceae. Five species are recognized. They are evergreen trees native to Africa. ''Afrocarpus'' was designated a genus in 1989, when several species formerly classified in ''Podocarpus'' and ''Nageia'' were reclassified.Christopher N. Page. 1989. "New and maintained genera in the conifer families Podocarpaceae and Pinaceae". ''Notes of the Royal Botanical Garden Edinburgh'' 45(2): 377-395. Taxonomy ''Afrocarpus'' was originally erected in 1948 as a section of the genus ''Podocarpus'', following a review of the latter by botanists John Theodore Buchholz and Netta Elizabeth Gray. It was raised to genus status by Christopher Nigel Page in 1989, a move well supported by more recent studies. In a 2009 treatment of the genus, only two species were recognized; ''A. dawei'', ''A. gracilior'', and ''A. usambarensis'' were sunk into ''A. falcatus''. The reason for this merger was that "variation across the group appears to be essentia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nageia
''Nageia'' is a genus of conifers belonging to the podocarp family Podocarpaceae.Christopher N. Page. 1990. "Podocarpaceae" pages 332-346. In: Klaus Kubitzki (general editor); Karl U. Kramer and Peter S. Green (volume editors) ''The Families and Genera of Vascular Plants'' volume I. Springer-Verlag: Berlin;Heidelberg, Germany. ''Nageia'' includes evergreen shrubs and trees, from one to 54 meters in height. A 2009 Treatise, treatment of the genus recognized five species.James E. Eckenwalder. 2009. ''Conifers of the World''. Timber Press: Portland, OR, USA. . Some authors consider ''Nageia formosensis'' to be a separate species from ''Nageia nagi'', thus recognizing six species. The podocarp genera have been reshuffled by various botanists. Most recently, several species formerly classed as ''Nageia'' were moved to the new genus ''Retrophyllum'', while ''Nageia falcata'' and ''Nageia mannii'' were moved to the new genus ''Afrocarpus''. Description ''Nageia'' are evergreen woody p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dacrycarpus
''Dacrycarpus'' is a genus of conifers belonging to the Family (biology), family Podocarpaceae.Christopher N. Page. 1990. "Podocarpaceae" pages 332-346. In: Klaus Kubitzki (general editor); Karl U. Kramer and Peter S. Green (volume editors) ''The Families and Genera of Vascular Plants'' volume I. Springer-Verlag: Berlin;Heidelberg, Germany. The genus includes nine species of plant sexuality, dioecious evergreen trees and shrubs to in height.James E. Eckenwalder. 2009. ''Conifers of the World''. Timber Press: Portland, OR, USA. . Species The species of ''Dacrycarpus'' Range (biology), range from New Zealand and Fiji, across New Caledonia, New Guinea, Indonesia, Malaysia and the Philippines to northern Myanmar and southern China. The greatest Biodiversity, diversity (five species) exists in New Guinea. References External links DacrycarpusAtAtThe Gymnosperm Database {{Authority control Dacrycarpus, Podocarpaceae genera Dioecious plants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Podocarpus Elatus
''Podocarpus elatus'', known as the plum pine, the brown pine, the Illawarra plum or the Queensland Christmas tree, is a species of ''Podocarpus'' endemic to the east coast of Australia, in eastern New South Wales and eastern Queensland. It is a medium to large evergreen tree growing to 30–36 m tall with a trunk up to 1.5 m diameter. The leaves are lanceolate, 5–15 cm long (to 25 cm long on vigorous young trees) and 6–18 mm broad. The seed cones are dark blue-purple, berry-like, with a fleshy base 2-2.5 cm diameter bearing a single oval or globose seed 1 cm in diameter. Uses The fleshy part of the seed cone is edible, used in condiments. The timber was prized for furniture, joinery, boat planking, lining and piles in salt water. ''Podocarpus elatus'' is an attractive ornamental tree. In older Australian suburbs, the plum pine is used as an ornamental street tree, such as at Baldry Street, Chatswood. The fruit has been used as a suitable alternativ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speciation
Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages. Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book ''On the Origin of Species''. He also identified sexual selection as a likely mechanism, but found it problematic. There are four geographic modes of speciation in nature, based on the extent to which speciating populations are isolated from one another: allopatric speciation, allopatric, peripatric speciation, peripatric, parapatric speciation, parapatric, and sympatric speciation, sympatric. Whether genetic drift is a minor or major contributor to speciation is the subject of much ongoing discussion. Rapid sympatric speciation can take place through polyploidy, such as by doubling of chromosome number; the result is progeny wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gondwanaland
Gondwana ( ; ) was a large landmass, sometimes referred to as a supercontinent. The remnants of Gondwana make up around two-thirds of today's continental area, including South America, Africa, Antarctica, Australia, Zealandia, Arabia, and the Indian subcontinent. Gondwana was formed by the accretion of several cratons (large stable blocks of the Earth's crust), beginning with the East African Orogeny, the collision of India and Madagascar with East Africa, and culminating in with the overlapping Brasiliano and Kuunga orogenies, the collision of South America with Africa, and the addition of Australia and Antarctica, respectively. Eventually, Gondwana became the largest piece of continental crust of the Paleozoic Era, covering an area of some , about one-fifth of the Earth's surface. It fused with Laurasia during the Carboniferous to form Pangaea. It began to separate from northern Pangea (Laurasia) during the Triassic, and started to fragment during the Early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dacrydium
''Dacrydium'' is a genus of conifers belonging to the podocarp family Podocarpaceae. Sixteen species of evergreen Plant sexuality, dioecious trees and shrubs are presently recognized. The genus was first described by Solander in 1786, and formerly included many more species, which were divided into sections A, B, and C by Florin in 1931. The revisions of de Laubenfels and Quinn (see references), reclassified the former section A as the new genus ''Falcatifolium'', divided Section C into new genera ''Lepidothamnus, Lagarostrobos'' and ''Halocarpus'', and retained Section B as genus ''Dacrydium''. Species , Plants of the World Online accepted twenty one species: Distribution The natural range of ''Dacrydium'' extends from New Zealand, New Caledonia, Fiji and the Solomon Islands through Malesia (New Guinea, Indonesia, Malaysia and the Philippines), to Thailand and southern China. References *de Laubenfels, David J. 1969. A revision of the Melanesia and Pacific rainforest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christopher Nigel Page
Christopher Nigel Page (1942–2022) was an English botanist who specialised in Ferns and Spermatophytes. He also worked on conifers, naming species of ''Afrocarpus'', for example '' Afrocarpus dawei'' and '' Afrocarpus gracilior'', '' Sundacarpus'' and '' Retrophyllum''. He read botany at Durham University then gained a PhD at Newcastle University, followed by a post-doctoral fellowship from 1968 to 1970 at the University of Queensland, in Brisbane, working on Queensland pteridophytes, before returning to the UK to work at Oxford University for a year. In 1971 he became a Fellow of the Linnean Society and that same year he joined the Royal Botanic Garden Edinburgh (RBGE), founding the RGBE Conifer Conservation Programme, now The International Conifer Conservation Programme. In 1976-77 he visited eastern Australia (Brisbane and Hobart) to work on pteridophytes (particularly '' Doodia'', '' Cheilanthes'' and '' Adiantum'') and also Japan, Taiwan, Hong Kong, The Philippines and N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phyllocladaceae
''Phyllocladus'', the celery pines, is a small genus of conifers, now usually placed in the family Podocarpaceae.James E. Eckenwalder. 2009. ''Conifers of the World''. Timber Press: Portland, OR, USA. .'' ''Species occur mainly in New Zealand, Tasmania, and Malesia in the Southern Hemisphere, though '' P. hypophyllus ''ranges into the Philippines, a short way north of the equator. Characteristics They are small to medium-sized trees, reaching 10–30 m tall, or sometimes small shrubs. The main structural shoots are green for 2–3 years, then turn brown as the bark thickens. The leaves are sparse, tiny, scale-like, 2–3 mm long, and only green (photosynthetic) for a short time, soon turning brown. Most photosynthesis is performed by highly modified, leaf-like short shoots called phylloclades; these develop in the axils of the scale leaves, and are simple or compound (depending on species). Simple phylloclades are rhombic, 2–5 cm long, and compound phylloclades are u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sensu Stricto
''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 concept, but it also appears in expressions that indicate the convention or context of the usage. Common qualifiers ''Sensu'' is the ablative case of the noun ''sensus'', here meaning "sense". It is often accompanied by an adjective (in the same case). Three such phrases are: * – "in the strict sense", abbreviation ''s.s.'' or ''s.str.''; * – "in the broad sense", abbreviation ''s.l.''; * – "in a relaxed, generous (or 'ample') sense", a similar meaning to ''sensu lato''. Søren Kierkegaard uses the phrase ''sensu eminenti'' to mean "in the pre-eminent r most important or significantsense". When appropriate, comparative and superlative adjectives may also be used to convey the meaning of "more" or "most". Thus ''sensu strict ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sister Taxon
In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and taxon B are sister groups to each other. Taxa A and B, together with any other extant or extinct descendants of their most recent common ancestor (MRCA), form a monophyletic group, the clade AB. Clade AB and taxon C are also sister groups. Taxa A, B, and C, together with all other descendants of their MRCA form the clade ABC. The whole clade ABC is itself a subtree of a larger tree which offers yet more sister group relationships, both among the leaves and among larger, more deeply rooted clades. The tree structure shown connects through its root to the rest of the universal tree of life. In cladistic standards, taxa A, B, and C may represent specimens, species, genera, or any other taxonomic units. If A and B are at the same taxonomic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Falcatifolium Taxoides
''Falcatifolium taxoides'' is a species of conifer in the family Podocarpaceae. It is found only in New Caledonia, and is the only known host of its non-photosynthetic, possibly parasitic relative, '' Parasitaxus usta''. Etymology ''Falcatifolium'' means 'with sickle-shaped leaves', while ''taxoides'' means 'yew-like' (resembling ''Taxus ''Taxus'' is a genus of coniferous trees or shrubs known as yews in the family Taxaceae. Yews occur around the globe in temperate zones of the northern hemisphere, northernmost in Norway and southernmost in the South Celebes. Some populations ex ...'').Gledhill, David (2008). "The Names of Plants". Cambridge University Press. (hardback), (paperback). pp 162, 372 References Podocarpaceae Least concern plants Endemic flora of New Caledonia Trees of New Caledonia Taxonomy articles created by Polbot Taxa named by Jean Antoine Arthur Gris Taxa named by Adolphe-Théodore Brongniart Taxa named by David John de Laubenfels {{conif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
