Violaceae

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Violaceae
Temporal range: Campanian–recent [1] [2]
Viola hedercea01.jpg
Viola banksii
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Violaceae
Batsch
Type genus
Viola
Subfamilies

See text.

Violaceae is a family of flowering plants established in 1802, consisting of about 1000 species in about 25 genera. It takes its name from the genus Viola , the violets and pansies.

Contents

Older classifications such as the Cronquist system placed the Violaceae in an order named after it, the Violales or the Parietales. However, molecular phylogeny studies place the family in the Malpighiales as reflected in the Angiosperm Phylogeny Group (APG) classification, with 41 other families, where it is situated in the parietal clade of 11 families. Most of the species are found in three large genera, Viola , Rinorea and Hybanthus . The other genera are largely monotypic or oligotypic. The genera are grouped into four clades within the family. The species are largely tropical or subtropical but Viola has a number of species in temperate regions. Many genera have a very restricted distribution.

Description

Though the best-known genus, Viola, is herbaceous, most species are shrubs, lianas or small trees. The simple leaves are alternate or opposite, often with leafy stipules or the stipules are reduced in size. Some species have palmate or deeply dissected leaves. Many species are acaulescent. The flower are solitary in panicles. Some species have cleistogamous flowers produced after or before the production of typical flowers with petals. Flowers are bisexual or unisexual (e.g. Melicytus), actinomorphic but typically zygomorphic with a calyx of five sepals that are persistent after flowering. Corollae have five mostly unequal petals, and the anterior petal is larger and often spurred. Plants have five stamens with the abaxial stamen often spurred at the base. The gynoecium is a compound pistil of three united carpels with one locule. Styles are simple, with the ovary superior and containing many ovules. The fruits are capsules split by way of three seams. Seeds have endosperm. [3] [4] [5]

Taxonomy

That Viola, previously included by Jussieu (1789) under Cisti, [6] should have its own family was first proposed by Ventenat in 1799, [7] and in 1803 placed the Viola species in a new genus, Ionidium which he described as "Famille des violettes." [8] [4] However, in the meantime Batsch established the Violaceae, as a suprageneric rank under the name of Violariae (1802), and as the first formal description, bears his name as the botanical authority. [9] Batsch included eight genera in this family. [10] Although Violariae continued to be used by some authors, such as Don (1831) [11] and Bentham and Hooker (1862) (as Violarieae), [12] most authors, such as Engler (1895), [13] adopted the alternative name Violaceae, proposed by de Lamarck and de Candolle in 1805, [14] and later by Gingins (1823) [15] and Saint-Hilaire (1824). [16] With the establishment of higher suprafamiliar orders, which he called "Alliances", Lindley (1853) placed his Violaceae within the Violales. [17]

Phylogeny

Historically, Violaceae has been placed within a number of orders since Lindley's treatment, principally Violales (Hutchinson, Takhtajan, Cronquist, Thorne) and the equivalent Parietales (Bentham and Hooker, Engler and Prantl, Melchior), [18] although such placement was considered unsatisfactory, [4] but also Polygalinae (Hallier) and Guttiferales (Bessey). [19] Of these, that of Melchior (1925), [20] within the Engler and Prantl system, has been considered one of the most influential. [4] Molecular phylogenetics resulted in the Angiosperm Phylogeny Group (APG) places it as one of a large number of families within the eudicot order Malpighiales. [21] Violaceae, as one of 42 families, is placed in a clade of 10 families within the order. Its place within the parietal clade reflects its earlier position in Parietales, those families with parietal placentation. There it forms a sister group to Goupiaceae. [22] [3] [23]

Oxalidales  (outgroup)

Malpighiales [22]
euphorbioids

Euphorbiaceae

Peraceae

phyllanthoids

Picrodendraceae

Phyllanthaceae

linoids

Linaceae

Ixonanthaceae

parietal clade
salicoids

Salicaceae

Scyphostegiaceae

Samydaceae

Lacistemataceae

Passifloraceae

Turneraceae

Malesherbiaceae

Violaceae

Goupiaceae

Achariaceae

Humiriaceae

clusioids

Hypericaceae

Podostemaceae

Calophyllaceae

Clusiaceae

Bonnetiaceae

ochnoids

Ochnaceae

Quiinaceae

Medusagynaceae

Rhizophoraceae

Erythroxylaceae

Ctenolophonaceae

Pandaceae

Irvingiaceae

chrysobalanoids

Chrysobalanaceae

Euphroniaceae

Dichapetalaceae

Trigoniaceae

Balanopaceae

malpighioids

Malpighiaceae

Elatinaceae

Centroplacaceae

Caryocaraceae

putranjivoids

Putranjivaceae

Lophopyxidaceae

Subdivision

History

The Violaceae are a medium-sized family with about 22–28 genera, and about 1,000–1,100 species. Most of the genera are monotypic or oligotypic, but the three genera Viola (about 600 species), Rinorea (about 250 species), and Hybanthus include 98% of the species with about half the species in Viola, and more than three-quarters of the remainder in the other two genera. [3] [24] [21] [4]

Many attempts have been made at an intrafamilial classification, but these have largely been artificial, based on floral characteristics. Subdivisions were recognized almost immediately. Early classifications identified two major divisions, that were followed by most taxonomists; [15] [17]

  • Alsodeieae. (Alsodineae, Rinoreeae). Radially symmetrical flowers (actinomorphic)
  • Violeae. Bilaterally symmetrical flowers (zygomorphic)

These also had biogeographical correlation, with the latter being almost exclusively South American and African, and the former being distributed in Europe in addition to the Americas. [17] In contrast, Bentham and Hooker (and some others) divided Alsodeieae, giving three tribes;

  • Violeae. Strictly zygomorphic
  • Paypayroleae. Actinomorphic wth some zygomorphic features
  • Alsodeieae. Strictly actinomorphic

Melchior utilized a more complex classification with two subfamilies, tribes and subtribes to recognize the place of Leonia within the Violaceae;. [4]

The historical subdivisions shown here are those of the system of Hekking (1988), based largely on floral symmetry, petal aestivation and petal morphology. In this system, most genera occur in the Rinoreae and Violeae tribes. [25] Three subfamilies have been recognized: the Violoideae, Leonioideae, and Fusispermoideae. [26] [3]

Subfamily Fusispermoideae
Subfamily Leonioideae
Subfamily Violoideae
Tribe Rinoreeae
Subtribe Hymenantherinae
Subtribe Isodendriinae
Subtribe Paypayrolinae
Subtribe Rinoreinae
Tribe Violeae

About 600 species, in the following genera, but mainly in Viola and Hybanthus and including all four of the lianescent genera in the family ( Agatea , Anchietea , Calyptrion and Hybanthopsis ; [27]

Molecular systems

Molecular phylogenetic studies have revealed that many of these divisions were not monophyletic, partly due to homoplasy. These studies demonstrate four major clades within the family. [3]

The molecularly defined subdivisions are; [3]

In Clade 1, Schweiggeria and Noisettia are monotypic and form a sister group to Viola. In addition to the major clades, there were a number of unplaced segregates. [3]

Etymology

The family derives its name from the nominative genus, Viola .

Distribution and habitat

The Violaceae have an overall cosmopolitan distribution, [3] but are essentially tropical and subtropical, with the exception of the numerous Northern Hemisphere temperate species of Viola, the largest genus, which is also occurs at higher altitudes in its tropical and subtropical regions, where the shrub, tree and lianescent species are concentrated. In those regions, most representative genera are the mainly woody Rinorea and Hybanthus. [25] While Viola, Hybanthus, and Rinorea are widely distributed in both hemispheres, the remaining genera are relatively restricted in their distribution. Some are restricted to a single continent while others have a limited area involving just a single archipelago. [4] About 70 species are found in Brazil. [25] [27]

Related Research Articles

<span class="mw-page-title-main">Cucurbitales</span> Order of flowering plants

The Cucurbitales are an order of flowering plants, included in the rosid group of dicotyledons. This order mostly belongs to tropical areas, with limited presence in subtropical and temperate regions. The order includes shrubs and trees, together with many herbs and climbers. One major characteristic of the Cucurbitales is the presence of unisexual flowers, mostly pentacyclic, with thick pointed petals. The pollination is usually performed by insects, but wind pollination is also present.

<span class="mw-page-title-main">Malpighiales</span> Eudicot order of flowering plants

The Malpighiales comprise one of the largest orders of flowering plants, containing about 36 families and more than 16,000 species, about 7.8% of the eudicots. The order is very diverse, containing plants as different as the willow, violet, poinsettia, manchineel, rafflesia and coca plant, and are hard to recognize except with molecular phylogenetic evidence. It is not part of any of the classification systems based only on plant morphology. Molecular clock calculations estimate the origin of stem group Malpighiales at around 100 million years ago (Mya) and the origin of crown group Malpighiales at about 90 Mya.

<i>Viola</i> (plant) Genus of flowering plants

Viola is a genus of flowering plants in the violet family Violaceae. It is the largest genus in the family, containing over 680 species. Most species are found in the temperate Northern Hemisphere; however, some are also found in widely divergent areas such as Hawaii, Australasia, and the Andes.

<span class="mw-page-title-main">Violales</span> Order of eudicot flowering plants

Violales is a botanical name of an order of flowering plants and takes its name from the included family Violaceae; it was proposed by Lindley (1853). The name has been used in several systems, although some systems used the name Parietales for similar groupings. In the 1981 version of the influential Cronquist system, order Violales was placed in subclass Dilleniidae with a circumscription consisting of the families listed below. Some classifications such as that of Dahlgren placed the Violales in the superorder Violiflorae.

<span class="mw-page-title-main">Scilloideae</span> Subfamily of bulbous monocot plants

Scilloideae is a subfamily of bulbous plants within the family Asparagaceae. Scilloideae is sometimes treated as a separate family Hyacinthaceae, named after the genus Hyacinthus. Scilloideae or Hyacinthaceae include many familiar garden plants such as Hyacinthus (hyacinths), Hyacinthoides (bluebells), Muscari and Scilla and Puschkinia. Some are important as cut flowers.

<span class="mw-page-title-main">Phyllanthaceae</span> Family of flowering plants

Phyllanthaceae is a family of flowering plants in the eudicot order Malpighiales. It is most closely related to the family Picrodendraceae.

<span class="mw-page-title-main">Ochnaceae</span> Family of flowering plants

Ochnaceae is a family of flowering plants in the order Malpighiales. In the APG III system of classification of flowering plants, Ochnaceae is defined broadly, to include about 550 species, and encompasses what some taxonomists have treated as the separate families Medusagynaceae and Quiinaceae. In a phylogenetic study that was published in 2014, Ochnaceae was recognized in the broad sense, but two works published after APG III have accepted the small families Medusagynaceae and Quiinaceae. These have not been accepted by APG IV (2016).

Parietales is an order of flowering plants. It is a descriptive botanical name for placentae parietales that characterised those plants. Thus it could be used even today. The termination -ales is only coincidentally identical to that appropriate to the rank of order.

<i>Hybanthus</i> Genus of flowering plants in Eudicot family Violaceae

Hybanthus (green-violet) is a genus of flowering plants in the family Violaceae. This genus name is Greek for "humpback flower", referring to the drooping pedicels of plants that are part of this genus. The genus is grossly polyphyletic and may contain up to nine different genera, of which Pombalia Vand., Cubelium Raf. and Pigea DC. have been previously recognised.

<span class="mw-page-title-main">Calophyllaceae</span> Family of flowering plants

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 Calophylleae of the family Clusiaceae. The Angiosperm Phylogeny Group determined that splitting this clade of genera off into their own family was necessary.

<span class="mw-page-title-main">Amaryllidaceae</span> Family of flowering plants

The Amaryllidaceae are a family of herbaceous, mainly perennial and bulbous flowering plants in the monocot order Asparagales. The family takes its name from the genus Amaryllis and is commonly known as the amaryllis family. The leaves are usually linear, and the flowers are usually bisexual and symmetrical, arranged in umbels on the stem. The petals and sepals are undifferentiated as tepals, which may be fused at the base into a floral tube. Some also display a corona. Allyl sulfide compounds produce the characteristic odour of the onion subfamily (Allioideae).

<span class="mw-page-title-main">Hippeastreae</span> Tribe of flowering plants

Hippeastreae is a tribe of plants belonging to the subfamily Amaryllidoideae of the Amaryllis family (Amaryllidaceae). Species in this tribe are distributed in South America. Flowers are large and showy, zygomorphic, with the stamens in varying lengths, inflorescence bracts are often fused basally. The seeds are flattened, winged or D-shaped. Reported basic chromosome numbers are x= 8-13, 17, and higher. All the species in this tribe present a remarkable aesthetic interest and horticultural value.

<span class="mw-page-title-main">Peraceae</span> Family of flowering plants

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 Euphorbiaceae expert, Airy Shaw.

<i>Schweiggeria</i> Genus of flowering plants in Eudicot family Violaceae

Schweiggeria is a genus of flowering plants in the violet family Violaceae, with one or two species, found in eastern Brazil.

<i>Noisettia</i> Genus of flowering plants in Eudicot family Violaceae

Noisettia is a genus of flowering plants in the violet family Violaceae, with a single known species.

<i>Calyptrion</i> Genus of flowering plants in Eudicot family Violaceae

Calyptrion is a genus of flowering plants in the violet family Violaceae, with four known species.

<i>Agatea</i> Genus of flowering plants in Eudicot family Violaceae

Agatea is a genus of flowering plants in the violet family Violaceae, with seven accepted species, found in New Guinea and New Caledonia.

<i>Anchietea</i> Genus of flowering plants in Eudicot family Violaceae

Anchietea is a genus of flowering plants in the violet family Violaceae, with six accepted species, found in tropical South America.

Hybanthopsis is a genus of flowering plants in the violet family Violaceae, with a single accepted species, found in north-east Brazil.

References

  1. Centeno-González, Naylet K.; Porras-Múzquiz, Héctor; Estrada-Ruiz, Emilio (2019-04-01). "A new fossil genus of angiosperm leaf from the Olmos Formation (upper Campanian), of northern Mexico". Journal of South American Earth Sciences. 91: 80–87. doi:10.1016/j.jsames.2019.01.016. ISSN   0895-9811.
  2. Centeno-González, N. K.; Upchurch, G. R.; Zúñiga, G.; Porras-Múzquiz, H.; Estrada-Ruiz, E. (2023-12-24). "PARATROPICAL rainforest from the Olmos formation (UPPER Campanian), Coahuila, Mexico". Cretaceous Research: 105813. doi:10.1016/j.cretres.2023.105813. ISSN   0195-6671.
  3. 1 2 3 4 5 6 7 8 Wahlert et al 2014.
  4. 1 2 3 4 5 6 7 8 Taylor 1972.
  5. Ballard et al 2013.
  6. Jussieu 1789.
  7. Ventenat 1799.
  8. Ventenat 1803–1804.
  9. Batsch 1802.
  10. IPNI 2020.
  11. Don 1831.
  12. Bentham & Hooker 1862.
  13. Reiche & Taubert 1887–1915.
  14. de Lamarck & de Candolle 1815.
  15. 1 2 Gingins 1823.
  16. Saint-Hilaire 1824.
  17. 1 2 3 Lindley 1853.
  18. Sharma 2009.
  19. Singh & Jain 2006.
  20. Melchior 1925.
  21. 1 2 APG IV 2016.
  22. 1 2 Xi et al 2012.
  23. Endress et al 2013.
  24. WFO 2019.
  25. 1 2 3 de Paula-Souza & Souza 2003.
  26. Hekking 1988.
  27. 1 2 Souza 2009.
  28. Paula-Souza, Juliana; Ballard, Harvey Eugene Jr. (2014-10-15). "Re-establishment of the name Pombalia, and new combinations from the polyphyletic Hybanthus (Violaceae)". Phytotaxa. 183 (1): 1. doi:10.11646/phytotaxa.183.1.1. ISSN   1179-3163.
  29. Paula-Souza, J.; Lima, A. G.; Souza, V. C. (2021-04-07). "The Violets of the Brazilian Savanna: A Revision of the Pombalia Lanata Complex (Violaceae), with Descriptions of Two New Species". Edinburgh Journal of Botany. 78: 1–32. doi: 10.24823/EJB.2021.357 . ISSN   1474-0036. S2CID   236758841.

Bibliography

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