Malpighiales Genera
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The Malpighiales comprise one of the largest
orders Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...
of
flowering plant 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 th ...
s, containing about 36 families and more than
species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
, about 7.8% of the
eudicots The eudicots, Eudicotidae, or eudicotyledons are a clade of flowering plants mainly characterized by having two seed leaves upon germination. The term derives from Dicotyledons. Traditionally they were called tricolpates or non-magnoliid dico ...
. The order is very diverse, containing plants as different as the
willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist s ...
,
violet Violet may refer to: Common meanings * Violet (color), a spectral color with wavelengths shorter than blue * One of a list of plants known as violet, particularly: ** ''Viola'' (plant), a genus of flowering plants Places United States * Viol ...
, poinsettia,
manchineel The manchineel tree (''Hippomane mancinella'') is a species of flowering plant in the spurge family (Euphorbiaceae). Its native range stretches from tropical southern North America to northern South America. The name "manchineel" (sometimes spel ...
,
rafflesia ''Rafflesia'' () is a genus of parasitic flowering plants in the family Rafflesiaceae. The species have enormous flowers, the buds rising from the ground or directly from the lower stems of their host plants; one species has the largest flowers i ...
and
coca plant Coca is any of the four cultivated plants in the family Erythroxylaceae, native to western South America. Coca is known worldwide for its psychoactive alkaloid, cocaine. The plant is grown as a cash crop in the Argentine Northwest, Bolivia, Al ...
, and are hard to recognize except with
molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
evidence. It is not part of any of the
classification Classification is a process related to categorization, the process in which ideas and objects are recognized, differentiated and understood. Classification is the grouping of related facts into classes. It may also refer to: Business, organizat ...
systems based only on
plant morphology Phytomorphology is the study of the morphology (biology), physical form and external structure of plants.Raven, P. H., R. F. Evert, & S. E. Eichhorn. ''Biology of Plants'', 7th ed., page 9. (New York: W. H. Freeman, 2005). . This is usually cons ...
.
Molecular clock The molecular clock is a figurative term for a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleoti ...
calculations estimate the origin of
stem group In phylogenetics, the crown group or crown assemblage is a collection of species composed of the living representatives of the collection, the most recent common ancestor of the collection, and all descendants of the most recent common ancestor. ...
Malpighiales at around 100 million years ago ( Mya) and the origin of
crown group In phylogenetics, the crown group or crown assemblage is a collection of species composed of the living representatives of the collection, the most recent common ancestor of the collection, and all descendants of the most recent common ancestor. ...
Malpighiales at about 90 Mya. The Malpighiales are divided into 32 to 42
families Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Ideall ...
, depending upon which
clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...
s in the order are given the
taxonomic rank In biological classification, taxonomic rank is the relative level of a group of organisms (a taxon) in an ancestral or hereditary hierarchy. A common system consists of species, genus, family (biology), family, order (biology), order, class (b ...
of family. In the
APG III system The APG III system of flowering plant classification is the third version of a modern, mostly molecular-based, system of plant taxonomy being developed by the Angiosperm Phylogeny Group (APG). Published in 2009, it was superseded in 2016 by a fur ...
, 35 families were recognized. Medusagynaceae, Quiinaceae, Peraceae, Malesherbiaceae, Turneraceae, Samydaceae, and Scyphostegiaceae were consolidated into other families. The largest family, by far, is the
Euphorbiaceae Euphorbiaceae, the spurge family, is a large family of flowering plants. In English, they are also commonly called euphorbias, which is also the name of a genus in the family. Most spurges, such as ''Euphorbia paralias'', are herbs, but some, e ...
, with about 6300 species in about 245
genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...
.Alan Radcliffe-Smith. 2001. ''Genera Euphorbiacearum''. Royal Botanic Gardens, Kew: Richmond, England. In a 2009
study Study or studies may refer to: General * Education **Higher education * Clinical trial * Experiment * Observational study * Research * Study skills, abilities and approaches applied to learning Other * Study (art), a drawing or series of drawi ...
of
DNA sequence DNA sequencing is the process of determining the nucleic acid sequence – the order of nucleotides in DNA. It includes any method or technology that is used to determine the order of the four bases: adenine, guanine, cytosine, and thymine. Th ...
s of 13
gene In biology, the word gene (from , ; "...Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a ba ...
s, 42 families were placed into 16
groups A group is a number of persons or things that are located, gathered, or classed together. Groups of people * Cultural group, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same ethnic iden ...
, ranging in size from one to 10 families. The relationships among these 16 groups remain poorly resolved. Malpighiales and
Lamiales The order Lamiales (also known as the mint order) are an order in the asterid group of dicotyledonous flowering plants. It includes about 23,810 species, 1,059 genera, and is divided into about 25 families. These families include Acanthaceae, Bi ...
are the two large orders whose
phylogeny A phylogenetic tree (also phylogeny or evolutionary tree Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, MA.) is a branching diagram or a tree showing the evolutionary relationships among various biological spec ...
remains mostly unresolved. Some examples of notable species include
cassava ''Manihot esculenta'', common name, commonly called cassava (), manioc, or yuca (among numerous regional names), is a woody shrub of the spurge family, Euphorbiaceae, native to South America. Although a perennial plant, cassava is extensively ...
, a tuber that is a major staple food crop in much of the world; the stinking corpse lily, which produces that largest known flower of any plant; the
willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist s ...
s;
flaxseed Flax, also known as common flax or linseed, is a flowering plant, ''Linum usitatissimum'', in the family Linaceae. It is cultivated as a food and fiber crop in regions of the world with temperate climates. Textiles made from flax are known in W ...
, an important food and fiber crop;
Saint John's wort ''Hypericum perforatum'', known as St. John's wort, is a flowering plant in the family Hypericaceae and the type species of the genus ''Hypericum''. Possibly a hybrid between '' H. maculatum'' and '' H. attenuatum'', the species can be found a ...
, a herb with a long history of medicinal uses;
castor bean ''Ricinus communis'', the castor bean or castor oil plant, is a species of perennial flowering plant in the spurge family, Euphorbiaceae. It is the sole species in the monotypic genus, ''Ricinus'', and subtribe, Ricininae. The evolution of ...
, the source of the infamous poison
ricin Ricin ( ) is a lectin (a carbohydrate-binding protein) and a highly potent toxin produced in the seeds of the castor oil plant, ''Ricinus communis''. The median lethal dose (LD50) of ricin for mice is around 22 micrograms per kilogram of body ...
;
passionfruit ''Passiflora edulis,'' commonly known as passion fruit, is a vine species of passion flower native to southern Brazil through Paraguay and northern Argentina. It is cultivated commercially in tropical and subtropical areas for its sweet, seedy f ...
, which produces an edible fruit and psychoactive flowers with a history of traditional medicinal uses; poinsettia, a common ornamental plant; the
mangosteen Mangosteen (''Garcinia mangostana''), also known as the purple mangosteen, is a tropical evergreen tree with edible fruit native to tropical lands surrounding the Indian Ocean. Its origin is uncertain due to widespread prehistoric cultivation. ...
;
manchineel tree The manchineel tree (''Hippomane mancinella'') is a species of flowering plant in the spurge family (Euphorbiaceae). Its native range stretches from tropical southern North America to northern South America. The name "manchineel" (sometimes spe ...
, one of the most toxic trees in the world; poplars, aspens, and cottonwoods which are commonly used for timber—and many more.


Affinities

Malpighiales is a member of a supraordinal group called the COM clade, which consists of the orders
Celastrales The Celastrales are an order of flowering plants found throughout the tropics and subtropics, with only a few species extending far into the temperate regions. The 1200"Lepidobotryaceae", "Parnassiaceae", and "Celastraceae" In: Klaus Kubitzki (ed ...
,
Oxalidales Oxalidales is an order of flowering plants, included within the rosid subgroup of eudicots. Compound leaves are common in Oxalidales and the majority of the species in this order have five or six sepals and petals. The following families are typic ...
, and Malpighiales. Some describe it as containing a fourth order,
Huales Huaceae is a family of plant in the rosids group, which has been classed in the orders Malpighiales, Malvales, and Violales or in its own order Huales. The APG II system placed it in the clade eurosids I, whereas the APG III system of 2009 an ...
, separating the family
Huaceae Huaceae is a family of plant in the rosids group, which has been classed in the orders Malpighiales, Malvales, and Violales or in its own order Huales. The APG II system placed it in the clade eurosids I, whereas the APG III system of 2009 and ...
into its own order, separate from Oxalidales.Alexander B. Doweld. 2001. ''Prosyllabus Tracheophytorum. Tentamen systematis plantarum vascularium (Tracheophyta)''. Geos: Moscow, Russia. Some recent studies have placed Malpighiales as sister to Oxalidales ''
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 ...
'' (including Huaceae), while others have found a different
topology In mathematics, topology (from the Greek language, Greek words , and ) is concerned with the properties of a mathematical object, geometric object that are preserved under Continuous function, continuous Deformation theory, deformations, such ...
for the COM clade. The COM clade is part of an unranked group known as
malvids The rosids are members of a large clade (monophyletic group) of flowering plants, containing about 70,000 species, more than a quarter of all angiosperms. The clade is divided into 16 to 20 orders, depending upon circumscription and classificatio ...
(rosid II), though formally placed in
Fabidae The rosids are members of a large clade ( monophyletic group) of flowering plants, containing about 70,000 species, more than a quarter of all angiosperms. The clade is divided into 16 to 20 orders, depending upon circumscription and classific ...
(rosid I). These in turn are part of a group that has long been recognized, namely, the
rosids The rosids are members of a large clade (monophyletic group) of flowering plants, containing about 70,000 species, more than a quarter of all angiosperms. The clade is divided into 16 to 20 orders, depending upon circumscription and classificatio ...
.


History

The French botanist
Charles Plumier Charles Plumier (; 20 April 1646 – 20 November 1704) was a French botanist after whom the frangipani genus ''Plumeria'' is named. Plumier is considered one of the most important of the botanical explorers of his time. He made three botanizing ...
named the genus '' Malpighia'' in honor of
Marcello Malpighi Marcello Malpighi (10 March 1628 – 30 November 1694) was an Italian biologist and physician, who is referred to as the "Founder of microscopical anatomy, histology & Father of physiology and embryology". Malpighi's name is borne by several phy ...
's work on plants; ''Malpighia'' is the
type genus In biological taxonomy, the type genus is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature, "The name-bearing type of a nominal f ...
for the
Malpighiaceae Malpighiaceae is a family of flowering plants in the order Malpighiales. It comprises about 73 genera and 1315 species, all of which are native to the tropics and subtropics. About 80% of the genera and 90% of the species occur in the New World ( ...
, a family of tropical and subtropical flowering plants. The family Malpighiaceae was the
type family In computer science, a type family associates data types with other data types, using a type-level function defined by an open-ended collection of valid instances of input types and the corresponding output types. Type families are a feature of s ...
for one of the orders created by Jussieu in his 1789 work ''Genera Plantarum''.
Friedrich von Berchtold Count Friedrich Carl Eugen Vsemir von Berchtold, baron von Ungarschitz ( cz, Bedřich Karel Eugen Všemír Berchtold hrabě z Uherčic; 25 October 1781 – 3 April 1876), was a German-speaking Bohemian physician and botanist from Austrian descen ...
and
Jan Presl Jan Svatopluk Presl (4 September 1791 – 6 April 1849) was a Czech natural scientist. He was the brother of botanist Carl Borivoj Presl (1794–1852). The Czech Botanical Society commemorated the two brothers by naming its principal publication ...
described such an order in 1820. Unlike modern
taxonomist In biology, taxonomy () is the scientific study of naming, defining ( circumscribing) and classifying groups of biological organisms based on shared characteristics. Organisms are grouped into taxa (singular: taxon) and these groups are given ...
s, these authors did not use the suffix "ales" in naming their orders. The name "Malpighiales" is attributed by some to Carl von Martius. In the 20th century, it was usually associated with John Hutchinson, who used it in all three editions of his book, ''The Families of Flowering Plants''.John Hutchinson ''The Families of Flowering Plants'' 3rd edition. 1973. Oxford University Press. The name was not used by those who wrote later, in the 1970s, '80s, and '90s. The taxon was largely presaged by
Hans Hallier Johannes (Hans) Gottfried Hallier (6 July 1868 – 10 March 1932) was a German botanist born in Jena. He studied botany and zoology at the University of Jena under Christian Ernst Stahl (1848–1919) and Ernst Haeckel (1834–1919), and con ...
in 1912 in an article in the ''Archiv. Néerl. Sci. Exact. Nat.'' titled "L'Origine et le système phylétique des angiospermes", in which his Passionales and Polygalinae were derived from Linaceae (in Guttales), with Passionales containing seven (of eight) families that also appear in the current Malpighiales, namely Passifloraceae, Salicaceae, Euphorbiaceae, Achariaceae, Flacourtiaceae, Malesherbiaceae, and Turneraceae, and Polygalinae containing four (of 10) families that also appear in the current Malpighiales, namely Malpighiaceae, Violaceae, Dichapetalaceae, and Trigoniaceae. The
molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
revolution led to a major restructuring of the order. The first semblance of Malpighiales as now known came from a phylogeny of
seed plants A spermatophyte (; ), also known as phanerogam (taxon Phanerogamae) or phaenogam (taxon Phaenogamae), is any plant that produces seeds, hence the alternative name seed plant. Spermatophytes are a subset of the embryophytes or land plants. They inc ...
published in 1993 and based upon
DNA sequence DNA sequencing is the process of determining the nucleic acid sequence – the order of nucleotides in DNA. It includes any method or technology that is used to determine the order of the four bases: adenine, guanine, cytosine, and thymine. Th ...
s of the gene ''rbcL''.Mark W. Chase et alii (42 authors). 1993. "Phylogenetics of seed plants: An analysis of nucleotide sequences from the plastid gene rbcL". ''Annals of the Missouri Botanical Garden'' 80(3):528-580. This study recovered a group of rosids unlike any group found in any previous system of plant classification. To make a clear break with
classification Classification is a process related to categorization, the process in which ideas and objects are recognized, differentiated and understood. Classification is the grouping of related facts into classes. It may also refer to: Business, organizat ...
systems being used at that time, the
Angiosperm Phylogeny Group The Angiosperm Phylogeny Group (APG) is an informal international group of systematic botanists who collaborate to establish a consensus on the taxonomy of flowering plants (angiosperms) that reflects new knowledge about plant relationships disco ...
resurrected Hutchinson's name, though his concept of Malpighiales included much of what is now in Celastrales and Oxalidales.


Circumscription

Malpighiales is
monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...
and in
molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
studies, it receives strong statistical support. Since the APG II system was published in 2003, minor changes to the
circumscription Circumscription may refer to: *Circumscribed circle *Circumscription (logic) *Circumscription (taxonomy) * Circumscription theory, a theory about the origins of the political state in the history of human evolution proposed by the American anthrop ...
of the order have been made. The family
Peridiscaceae Peridiscaceae is a family of flowering plants in the order Saxifragales.Peter F. Stevens. 2001 onwards. "Peridiscaceae". At: Angiosperm Phylogeny Website At: Missouri Botanical Garden Website. (see ''External links'' below). Four genera comprise ...
has been expanded from two genera to three, and then to four, and transferred to
Saxifragales The Saxifragales (saxifrages) are an order of flowering plants (Angiosperms). They are an extremely diverse group of plants which include trees, shrubs, perennial herbs, succulent and aquatic plants. The degree of diversity in terms of vege ...
. The genera ''
Cyrillopsis ''Cyrillopsis'' is a genus of flowering plants belonging to the family Ixonanthaceae Ixonanthaceae is a pantropical flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly ca ...
'' (
Ixonanthaceae Ixonanthaceae is a pantropical flowering plant 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, ves ...
), ''
Centroplacus ''Centroplacus'' is a genus of the family Centroplacaceae. It was formerly classified in the Phyllanthaceae and given its own tribe, the Centroplaceae. It contains a single species, ''Centroplacus glaucinus''. General information ''C. glaucin ...
'' (
Centroplacaceae Centroplacaceae is a family of flowering plants in the order Malpighiales and is recognized by the APG III system of classification. The family comprises two genera: ''Bhesa'', which was formerly recognized in the Celastraceae, and ''Centroplacus ...
), '' Bhesa'' (Centroplacaceae), ''
Aneulophus ''Aneulophus'' is a genus of flowering plants belonging to the family Erythroxylaceae. Its native range is Western Central Tropical Africa Although tropical Africa is mostly familiar to the West for its rainforests, this biogeographic realm ...
'' (
Erythroxylaceae Erythroxylaceae (the coca family) is a family of flowering trees and shrubs consisting of 4 genera and 271 species. The four genera are ''Aneulophus'' Benth., ''Erythroxylum'' P.Browne, ''Nectaropetalum'' Engl., and ''Pinacopodium'' Exell & Mendo ...
), ''
Ploiarium ''Ploiarium'' is a genus of three species of woody plants in the family Bonnetiaceae. It is native to tropical forests and peat swamp forests in Southeast Asia including southern Indochina, Malay Peninsula, Sumatra, and Borneo. Species are genera ...
'' (
Bonnetiaceae Bonnetiaceae is a family of flowering plants, consisting of 4 genera and 41 species. The family is Neotropical, with the exception of the genus ''Ploiarium'', which is found in Malesia. It is sister to the family Clusiaceae The Clusiaceae or ...
), ''
Trichostephanus ''Trichostephanus'' is a genus of flowering plants belonging to the family Salicaceae The Salicaceae is the willow family of flowering plants. The traditional family (Salicaceae ''sensu stricto'') included the willows, poplar, aspen, and cot ...
'' ( Samydaceae), ''
Sapria ''Sapria'' is a genus of parasitic flowering plants in the family Rafflesiaceae. It grows within roots of ''Vitis'' and ''Tetrastigma''. The genus is limited to the tropical forests of South and Southeast Asia. The flowers of ''Sapria'' are abou ...
'' (
Rafflesiaceae The Rafflesiaceae are a family of rare parasitic plants comprising 36 species in 3 genera found in the tropical forests of east and southeast Asia, including ''Rafflesia arnoldii'', which has the largest flowers of all plants. The plants are end ...
), ''
Rhizanthes ''Rhizanthes'' is a genus of four species of parasitic flowering plants in the family Rafflesiaceae. They are without leaves, stems, roots, or photosynthetic tissue, and grow within the roots of a few species of '' Tetrastigma'' vines. The genus ...
'' (Rafflesiaceae), and ''
Rafflesia ''Rafflesia'' () is a genus of parasitic flowering plants in the family Rafflesiaceae. The species have enormous flowers, the buds rising from the ground or directly from the lower stems of their host plants; one species has the largest flowers i ...
'' (Rafflesiaceae) had been either added or confirmed as members of Malpighiales by the end of 2009. Some family delimitations have changed, as well, most notably, the
segregation Segregation may refer to: Separation of people * Geographical segregation, rates of two or more populations which are not homogenous throughout a defined space * School segregation * Housing segregation * Racial segregation, separation of humans ...
of
Calophyllaceae Calophyllaceae is a family of flowering plants in the order Malpighiales and is recognized by the APG III system of classification. Most of the 14 genera and 475 species included in this family were previously recognized in the tribe Calophy ...
from
Clusiaceae The Clusiaceae or Guttiferae Juss. (1789) (''nom. alt. et cons.'' = alternative and valid name) are a family of plants including 13 genera and ca 750 species. Several former members of Clusiacae are now placed in Calophyllaceae and Hypericaceae. ...
''sensu lato'' when it was shown that the latter is
paraphyletic In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...
. Some differences of opinion on family delimitation exist, as well. For example, Samydaceae and Scyphostegiaceae may be recognized as families or included in a large version of
Salicaceae The Salicaceae is the willow family of flowering plants. The traditional family (Salicaceae ''sensu stricto'') included the willows, poplar, aspen, and cottonwoods. Genetic studies summarized by the Angiosperm Phylogeny Group (APG) have greatly ...
.Mac H. Alford. 2007.
Samydaceae
". Version 6 February 2007". In: The Tree of Life Web Project.
The group is difficult to characterize phenotypically, due to sheer morphological diversity, ranging from tropical holoparasites with giant flowers and temperate trees and herbs with tiny, simple flowers. Members often have dentate leaves, with the teeth having a single vein running into a congested and often deciduous apex (i.e., violoid, salicoid, or theoid). Also, zeylanol has recently been discovered in ''Balanops'' and ''Dichapetalum'' which are in the balanops clade (so-called Chrysobalanaceae s. l.). The so-called parietal suborder (the clusioid clade and Ochnaceae s. l. were also part of Parietales) corresponds with the traditional Violales as 8 (Achariaceae, Violaceae, Flacourtiaceae, Lacistemataceae, Scyphostegiaceae, Turneraceae, Malesherbiaceae, and Passifloraceae) of the order's 10 families along with Salicaceae, which have usually been assigned as a related order or suborder, are in this most derived malpighian suborder, so that eight of the 10 families of this suborder are Violales. The family Flacourtiaceae has proven to be polyphyletic as the cyanogenic members have been placed in Achariaceae and the ones with salicoid teeth were transferred to Salicaceae. Scyphostegiaceae, consisting of the single genus ''
Scyphostegia ''Scyphostegia borneensis'' is a species of shrub or small tree endemic to Borneo. This unusual plant is the only species in the genus ''Scyphostegia''. In many taxonomic classifications the genus was placed in its own family, the Scyphostegiacea ...
'' has been merged into Salicaceae.


Phylogeny


2009

The phylogeny of Malpighiales is, at its deepest level, an unresolved
polytomy An internal node of a phylogenetic tree is described as a polytomy or multifurcation if (i) it is in a rooted tree and is linked to three or more child subtrees or (ii) it is in an unrooted tree and is attached to four or more branches. A tr ...
of 16 clades. It has been estimated that complete resolution of the phylogeny will require at least 25000
base pair A base pair (bp) is a fundamental unit of double-stranded nucleic acids consisting of two nucleobases bound to each other by hydrogen bonds. They form the building blocks of the DNA double helix and contribute to the folded structure of both DNA ...
s of DNA sequence data per
taxon In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ...
. A similar situation exists with Lamiales and it has been analyzed in some detail. The
phylogenetic tree A phylogenetic tree (also phylogeny or evolutionary tree Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, MA.) is a branching diagram or a tree showing the evolutionary relationships among various biological spec ...
shown below is from Wurdack and Davis (2009). The statistical support for each branch is 100% bootstrap percentage and 100%
posterior probability The posterior probability is a type of conditional probability that results from updating the prior probability with information summarized by the likelihood via an application of Bayes' rule. From an epistemological perspective, the posterior p ...
, except where labeled, with bootstrap percentage followed by posterior probability.


2012

In 2012, ''Xi et al.'' managed to obtain a more resolved phylogenetic tree than previous studies through the use of data from a large number of genes. They included analyses of 82 plastid genes from 58 species (they ignored the problematic
Rafflesiaceae The Rafflesiaceae are a family of rare parasitic plants comprising 36 species in 3 genera found in the tropical forests of east and southeast Asia, including ''Rafflesia arnoldii'', which has the largest flowers of all plants. The plants are end ...
), using partitions identified
a posteriori ("from the earlier") and ("from the later") are Latin phrases used in philosophy to distinguish types of knowledge, justification, or argument by their reliance on empirical evidence or experience. knowledge is independent from current ex ...
by applying a
Bayesian Thomas Bayes (/beɪz/; c. 1701 – 1761) was an English statistician, philosopher, and Presbyterian minister. Bayesian () refers either to a range of concepts and approaches that relate to statistical methods based on Bayes' theorem, or a followe ...
mixture model. Xi ''et al.'' identified 12 additional clades and three major, basal clades. Changes made in the
Angiosperm Phylogeny Group The Angiosperm Phylogeny Group (APG) is an informal international group of systematic botanists who collaborate to establish a consensus on the taxonomy of flowering plants (angiosperms) that reflects new knowledge about plant relationships disco ...
(APG) classification of 2016 (APG IV) were the inclusion of
Irvingiaceae Irvingiaceae is a family of flowering plants, consisting of 13 species in the 3 genera ''Allantospermum'', ''Irvingia'' and ''Klainedoxa''. '' Desbordesia'', formerly accepted is now included in ''Irvingia''. The family is named for the Scottish ...
,
Peraceae Peraceae Klotzsch is a family of flowering plants in the eudicot order Malpighiales. The family was segregated from the Euphorbiaceae by Johann Friedrich Klotzsch in 1859, and its uniqueness was affirmed by the Royal Botanic Gardens, Kew's Eup ...
,
Euphorbiaceae Euphorbiaceae, the spurge family, is a large family of flowering plants. In English, they are also commonly called euphorbias, which is also the name of a genus in the family. Most spurges, such as ''Euphorbia paralias'', are herbs, but some, e ...
and
Ixonanthaceae Ixonanthaceae is a pantropical flowering plant 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, ves ...
, together with the transfer of the COM clade from the fabids (rosid I) to the malvids (rosid II).


References


Bibliography

* * * * * * (''see also''
Angiosperm Phylogeny Website The Angiosperm Phylogeny Website (or APweb) is a website dedicated to research on angiosperm phylogeny and taxonomy. The site is hosted by the Missouri Botanical Garden website and maintained by researchers, Peter F. Stevens and Hilary M. Davis ...
)


External links

{{Authority control Angiosperm orders Extant Aptian first appearances