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APG IV System
The APG IV system of flowering plant classification is the fourth version of a modern, mostly molecular-based, system of plant taxonomy for flowering plants (angiosperms) being developed by the Angiosperm Phylogeny Group (APG). It was published in 2016, seven years after its predecessor the APG III system was published in 2009, and 18 years after the first APG system was published in 1998. In 2009, a linear arrangement of the system was published separately; the APG IV paper includes such an arrangement, cross-referenced to the 2009 one. Compared to the APG III system, the APG IV system recognizes five new orders (Boraginales, Dilleniales, Icacinales, Metteniusales and Vahliales), along with some new families, making a total of 64 angiosperm orders and 416 families. In general, the authors describe their philosophy as "conservative", based on making changes from APG III only where "a well-supported need" has been demonstrated. This has sometimes resulted in placements that a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angiosperm Floral Evolution
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants that produce their seeds enclosed within a fruit. They are by far the most diverse group of land plants with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. Angiosperms were formerly called Magnoliophyta (). Like gymnosperms, angiosperms are seed-producing plants. They are distinguished from gymnosperms by characteristics including flowers, endosperm within their seeds, and the production of fruits that contain the seeds. The ancestors of flowering plants diverged from the common ancestor of all living gymnosperms before the end of the Carboniferous, over 300 million years ago. The closest fossil relatives of flowering plants are uncertain and contentious. The earliest angiosperm fossils are in the fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cabombaceae
The Cabombaceae are a family of aquatic, herbaceous flowering plants. A common name for its species is water shield. The family is recognised as distinct in the Angiosperm Phylogeny Group IV system (2016). The family consists of two genera of aquatic plants, ''Brasenia'' and '' Cabomba'', totalling six species. The Cabombaceae are all aquatic, living in still or slow-moving waters of temperate and tropical North and South America, Europe, Asia, Africa, and Australia. Although found on all continents but Antarctica, the plants tend to grow in relatively restricted ranges. The family has an extensive fossil record from the Cretaceous with plants that exhibit affinities to either the Cabombaceae or Nymphaeaceae occurring in the Early Cretaceous. One such likely Cretaceous member is the genus '' Pluricarpellatia'', found in rocks 115 million years old in what is now Brazil. The APG system of 1998 included this family in the water lily family Nymphaeaceae, as did the APG II syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aristolochiaceae
The Aristolochiaceae () are a family, the birthwort family, of flowering plants with seven genera and about 400 known species belonging to the order Piperales. The type genus is ''Aristolochia'' L. Description They are mostly perennial, herbaceous plants, shrubs, or lianas. The membranous, cordate simple leaves are spread out, growing alternately along the stem on leaf stalks. The margins are commonly entire. No stipules are present. The bizarre flowers are large to medium-sized, growing in the leaf axils. They are bilaterally or radially symmetrical. Classification Aristolochiaceae are magnoliids, a basal group of angiosperms which are not part of the large categories of monocots or eudicots. As of APG IV (2016), the former families Hydnoraceae and Lactoridaceae are included, because exclusion would make Aristolochiaceae in the traditional sense paraphyletic. Some newer classification schemes, such as the update of the Angiosperm Phylogeny Group, place the family Aristol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piperaceae
The Piperaceae (), also known as the pepper family, are a large family of flowering plants. The group contains roughly 3,600 currently accepted species in 5 genera. The vast majority of species can be found within the two main genera: ''Piper'' (2,171 species) and ''Peperomia'' (over 1,000 species). Members of the Piperaceae may be small trees, shrubs, or herbs. The distribution of this group is best described as pantropical. The best-known species, ''Piper nigrum'', yields most peppercorns that are used as spices, including black pepper, although its relatives in the family include many other spices. Etymology The name Piperaceae is likely to be derived from the Sanskrit term ''pippali'', sa, पिप्पली, which was used to describe long peppers (like those of ''Piper longum''). Taxonomy The APG III system of 2009 recognizes this family, and assigns it to the order Piperales in the unranked clade magnoliids. The family consists of five genera: ''Piper'', ''Peperom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saururaceae
Saururaceae is a plant family comprising four genera and seven species of herbaceous flowering plants native to eastern and southern Asia and North America. The family has been recognised by most taxonomists, and is sometimes known as the "lizard's-tail family". The APG IV system (2016; unchanged from the 2009 APG III system, the 2003 APG II system and the 1998 APG system) assigned it to the order Piperales in the clade magnoliids. Species *''Anemopsis californica'' (Nutt.) Hook. & Arn. (yerba mansa). – North America. *'' Gymnotheca chinensis'' Decne. – Asia. *'' Gymnotheca involucrata'' S. J. Pei. – Asia. *''Houttuynia cordata'' Thunberg. – Asia. *''Houttuynia emeiensis'' Z.Y.Zhu & S.L.Zhang - Asia. *''Saururus cernuus'' L. (lizard's tail, water-dragon)– North America. *''Saururus chinensis'' (Loureiro) Baillon. – Asia. *†''Saururus tuckerae'' - Middle Eocene *†'' Saururus aquilae'' - Late Cretaceous (Campanian) *†'' Saururus stoobensis'' - Miocene The Mioc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piperales
Piperales is an order of flowering plants (4,170 recognized species). It necessarily includes the family Piperaceae but other taxa have been included or disincluded variously over time. Well-known plants which may be included in this order include black pepper, kava, pepper elder, lizard's tail, birthwort, and wild ginger. Classification APG system In the APG IV system, of 2016, this order is placed in the clade magnoliids and is circumscribed as follows: *order Piperales *: family Aristolochiaceae (including Asaraceae, Hydnoraceae and Lactoridaceae) *: family Piperaceae *: family Saururaceae This is an expansion from the APG system, of 1998, which used the same placement (in the magnoliids) but used this circumscription: * order Piperales'' *: family Aristolochiaceae *: family Lactoridaceae *: family Piperaceae *: family Saururaceae Earlier systems The Cronquist system, of 1981, placed the order in the subclass Magnoliidae of class Magnoliopsida dicotyledonsand used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winteraceae
Winteraceae is a primitive family of tropical trees and shrubs including 93 species in five genera. It is of particular interest because it is such a primitive angiosperm family, distantly related to Magnoliaceae, though it has a much more southern distribution. Plants in this family grow mostly in the southern hemisphere, and have been found in tropical to temperate climate regions of Malesia, Oceania, eastern Australia, New Zealand, Madagascar and the Neotropics, with most of the genera concentrated in Australasia and Malesia. The five genera, ''Takhtajania, Tasmannia, Drimys, Pseudowintera'', and ''Zygogynum s.l.'' all have distinct geographic extant populations. ''Takhtajania'' includes a single species, ''T. perrieri'', endemic only to Madagascar, ''Tasmannia'' has the largest distribution of genera in Winteraceae with species across the Philippines, Borneo, New Guinea, Eastern Australia, and Tasmannia, '' Drimys'' is found in the Neotropical realm, from southern Mexico to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canellaceae
The Canellaceae are a family of flowering plants in the order Canellales.Walter S. Judd, Christopher S. Campbell, Elizabeth A. Kellogg, Peter F. Stevens, and Michael J. Donoghue. 2008. ''Plant Systematics: A Phylogenetic Approach'', Third Edition. Sinauer Associates: Sunderland, MA, USA. The order includes only one other family, the Winteraceae.Peter F. Stevens (2001 onwards). "Canellaceae" At: Angiosperm Phylogeny Website. At: Botanical Databases At: Missouri Botanical Garden Website. (see ''External links'' below) Canellaceae is native to the Afrotropical and Neotropical realms. They are small to medium trees, rarely shrubs, evergreen and aromatic.Vernon H. Heywood (with David J. Mabberley). 2007. "Canellaceae" page 84. In: Vernon H. Heywood, Richard K. Brummitt, Ole Seberg, and Alastair Culham. ''Flowering Plant Families of the World''. Firefly Books: Ontario, Canada. (2007). . The flowers and fruit are often red. Several species of Canellaceae are important in herbal medici ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canellales
Canellales is the botanical name for an order of flowering plants, one of the four orders of the magnoliids. It is recognized by the most recent classification of flowering plants, the APG IV system. It is defined to contain two families: Canellaceae and Winteraceae, which comprise 136 species of fragrant trees and shrubs. The Canellaceae are found in tropical America and Africa, and the Winteraceae are part of the Antarctic flora (found in diverse parts of the southern hemisphere). Although the order was defined based on phylogenetic studies, a number of possible synapomorphies have been suggested, relating to the pollen tube, the seeds, the thickness of the integument, and other aspects of the morphology. Until 1999, these two families were not considered to be closely related. Instead the Winteraceae were considered to be a primitive family (due to the structure of the xylem and carpel, a structure which now seems to be derived from xylem and carpels more typical of the ang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnoliids
Magnoliids (or Magnoliidae or Magnolianae) are a clade of flowering plants. With more than 10,000 species, including magnolias, nutmeg, bay laurel, cinnamon, avocado, black pepper, tulip tree and many others, it is the third-largest group of angiosperms after the eudicots and monocots. The group is characterized by trimerous flowers, pollen with one pore, and usually branching-veined leaves. Some members of the subclass are among the earliest angiosperms and share anatomical similarities with gymnosperms like stamens that resemble the male cone scales of conifers and carpels found on the long flowering axis. Classification "Magnoliidae" is the botanical name of a subclass, and "magnoliids" is an informal name that does not conform to the International Code of Nomenclature for algae, fungi, and plants. The circumscription of a subclass will vary with the taxonomic system being used. The only requirement is that it must include the family Magnoliaceae. The informal name "magnoliids ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schisandraceae
Schisandraceae is a family of flowering plants with 3 known genera and a total of 92 known species. Such a family has been recognized by most taxonomists, at least for the past several decades. Before that, the plants concerned were assigned to family Magnoliaceae and Illiciaceae. The APG IV and APG III systems of taxonomy recognize this family and place it on the order Austrobaileyales. The APG II system, of 2003, also recognizes such a family. It places the family in order Austrobaileyales, which in turn is accepted as being among the most basic lineages in the clade angiosperms. APG II assumes this to be a family of three genera, the Schisandraceae ''sensu lato''. This family consists of woody plants, containing essential oils. However, APG II does allow the option of segregating the genus ''Illicium'' as the family Illiciaceae. This leaves only two genera in the family Schisandraceae ''sensu stricto'', consisting of ''Schisandra'' and ''Kadsura'', totalling several dozen s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trimeniaceae
Trimeniaceae is a family of flowering plants recognized by most taxonomists, at least for the past several decades. It is a small family of one genus, '' Trimenia'', with eight known species (Christenhusz & Byng 2016) of woody plants, bearing essential oils. The family is subtropical to tropical and found in Southeast Asia, eastern Australia and on several Pacific Islands. Taxonomy APG IV The APG IV system, of 2016, recognizes this family and places it in order Austrobaileyales, an order which is accepted as being among the most basal lineages in the clade angiosperms. APG III The APG III system, of 2009, also recognizes such a family and places it in order Austrobaileyales, an order which is accepted as being among the most basal lineages in the clade angiosperms. APG II The APG II system, of 2003, also recognizes such a family and places it in order Austrobaileyales, an order which is accepted as being among the most basal lineages in the clade angiosperms. APG The APG syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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