Dodonaea

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Dodonaea
Dodonea viscosa flowers1.JPG
Dodonaea viscosa foliage and flowers
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Sapindaceae
Subfamily: Dodonaeoideae
Genus: Dodonaea
Mill. [1]
Species

See text

Dodonaea, commonly known as hop-bushes, [2] [3] is a genus of about 70 species of flowering plants in the soapberry family, Sapindaceae. The genus has a cosmopolitan distribution in tropical, subtropical and warm temperate regions of Africa, the Americas, southern Asia and Australasia, but 59 species are endemic to Australia. [4] [5]

Contents

Plants in the genus Dodonaea are shrubs or small trees and often have sticky foliage, with simple or pinnate leaves arranged alternately along the stems. The flowers are male, female or bisexual and are borne in leaf axils or on the ends of branchlets and lack petals. The fruit is an angled or winged capsule.

Description

Plants in the genus Dodonaea are shrubs or small trees that typically grow to a height of 0.1–4 m (3.9 in – 13 ft 1.5 in) and are dioecious, monoecious or polygamous and often have sticky foliage. The leaves are arranged alternately along the stems and are simple or pinnate. The flowers have three to seven sepals but that fall of as the flowers mature, but no petals. There are six to sixteen stamens (except in female flowers), the filaments shorter than the anthers, the style is threadlike and the ovary in female flowers has two to six carpels. The fruit is a two to six angled or winged capsule. [2] [4] [5]

Taxonomy

The genus Dodonaea was first formally described in 1754 by Philip Miller in The Gardeners Dictionary and the first species he described was Dodonaea viscosa . [6] The genus name (Dodonaea) honours Dodonaeus, (the latinised form of Dodoens), a Flemish physician and botanist. [7]

Species

The following is a list of Dodonaea species accepted by Plants of the World Online as at April 2024: [8]

Systematics

Dodonaea is one of the largest genera in the Sapindaceae, and includes 70 species widely distributed in continental Australia. [9] The only other species of the Dodonaea widely spread beyond mainland Australia, Dodonaea viscosa, is believed to be one of the world's most greatly disseminated transoceanic plants. [9]

The first attempts to distinguish infrageneric categories within genus Dodonaea were based on leaf morphology, specifically, two sections - Eu-Dodonaea (simple leaves) and Remberta (pinnate leaves) were differentiated. [9] Later this sectional classification was expanded by Bentham, who included 39 species in five series - four simple-leaved series further divided on capsule-appendage morphology (series Cyclopterae, Platypterae, Cornutae and Apterae) and one pinnate-leaved species (series Pinnatae).

Later the genus was reviewed extensively two times. Radlkofer identified Dodonaea as a part of the tribe Dodonaeeae, within Dyssapindaceae, together with Loxodiscus, Diplopeltis and Distichostemon. Dodonaea and Distichostemon share similar morphological characteristics which include plants having regular flowers without petals and an intrastaminal disc. Therefore, these two genera are considered to be closely related. [10]

54 Dodonaea species identified by Radlkofer were divided into three series (Cyclopterae, Platypterae and Aphanopterae) and six subseries. [9]

Another revision of the genus was proposed by West, where Dodonaea were divided into six species groups by using a combination of characters. [11] Species with the most primitive characters were classified in Group 1 and Group 6 included plants with the most derived states. For instance, the character of an aril possession was recognized as a derived trait.

The most recent molecular study of phylogenetic relationships within the genus revealed some discrepancy with the previously stated hypotheses of morphological evolution within Dodonaea which classified taxa by the combination of leaf, capsule and seed characters. As in preceding morphological research, [11] species with compound leaves were identified in several clades, interspersed among species with simple leaves (e.g. D. humilis is the only species in Clade I with imparipinnate leaves). The breeding system has great variation across the phylogeny, and although most species are dioecious, sometimes some species may differ from this state being monoecious. Most genera in Sapindaceae are dioecious, however, most closely related to Dodonaea in the phylogeny (Diplopeltis, Diplopeltis stuartii and Cossinia) are monoecious. It has also been reported that whereas normally breeding system in Harpullia is dioecism, a few species have also been recognized as monoecious. [12] It was stated that during evolution a general breeding-system across the phylogeny was dioecism, however, the polygamous state was intermediate or, might be partially reversible.

Molecular data supports an evidence that monophyly of Dodonaea includes all species of Distichostemon. [9] It is also supported by the morphological characters as synapomorphies of flowers with reduced petal number and with a highly reduced intrastaminal disk, the trait which is absent in staminate flowers. Both West and Radlkofer used an aril presence or absence as a character to define species groups. All the main clades of Dodonaea and also two species of Diplopeltis have small funicular arils. [9] Seeds of D. viscosa have very small funicular aril, and are harvested by Pheidole ants and deposited in middens outside the nest after the elaiosome has been consumed. [13]

Bayesian MCMC estimation of Dodonaea phylogeny supported the hypothesis that two species of Cossinia are sisters to Diplopeltis and Dodonaea. [9] Nevertheless, Diplopeltis is identified as a paraphyletic group. The monophyly of Dodonaea is well supported by Bayesian MCMC estimation (1.00 posterior probability, PP). [9]

Dodonaea viscosa is placed within the Clade IV, being closely related to D. biloba , D. procumbens and D. camfieldii . It is known that D. viscosa and D. camfieldii evolved in Australia from their most recent common ancestor. [9]

Related Research Articles

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

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

Alectryon is a genus of about 30 species of trees and shrubs from the family Sapindaceae. They grow naturally across Australasia, Papuasia, Melanesia, western Polynesia, east Malesia and Southeast Asia, including across mainland Australia, especially diverse in eastern Queensland and New South Wales, the Torres Strait Islands, New Guinea, the Solomon Islands, New Caledonia, New Zealand, Vanuatu, Fiji, Samoa, Hawaii, Indonesia and the Philippines. They grow in a wide variety of natural habitats, from rainforests, gallery forests and coastal forests to arid savannas and heaths.

<i>Dodonaea viscosa</i> Species of flowering plant in the family Sapindaceae

Dodonaea viscosa, also known as the broadleaf hopbush, is a species of flowering plant in the Dodonaea (hopbush) genus that has a cosmopolitan distribution in tropical, subtropical and warm temperate regions of Africa, the Americas, southern Asia and Australasia. Dodonaea is part of Sapindaceae, the soapberry family.

<i>Commersonia</i> Genus of flowering plants

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<i>Dillwynia</i> Genus of legumes

Dillwynia is a genus of about 20 species of flowering plants in the family Fabaceae, and is endemic to Australia. Plants in this genus are shrubs with simple leaves and yellow or red and yellow flowers similar to others in the family.

<i>Mirbelia</i> Genus of legumes

Mirbelia is a plant genus belonging to the family Fabaceae and is endemic to Australia, occurring in every mainland state except South Australia. Plants in the genus Mirbelia are prickly, perennial shrubs with simple, sometimes sharply-pointed leaves, or the leaves absent. The flowers are arranged singly or in groups in leaf axils or on the ends of branches, the sepals joined at the base with five teeth. The petals are usually red, orange, purplish or bluish and the fruit is an inflated pod.

<i>Thryptomene</i> Genus of flowering plants

Thryptomene is a genus of flowering plants in the family Myrtaceae and is endemic to Australia. Plants in the genus Thryptomene are shrubs with small leaves arranged in opposite pairs and white or pink flowers. About forty-seven species of Thryptomene, occurring in all Australian states and the Northern Territory, have been formally described.

<i>Lepiderema</i> Genus of trees

Lepiderema is a genus of eight species of trees in the lychee family Sapindaceae native to New Guinea and eastern Australia, plus one more from Queensland that is yet to be formally described. The type species is Lepiderema papuana.

<i>Hypocalymma</i> Genus of flowering plants

Hypocalymma is a genus of evergreen shrubs in the myrtle family Myrtaceae described as a genus in 1840. The entire genus is endemic to southern Western Australia.

<i>Phebalium</i> Genus of shrubs

Phebalium is a genus of thirty species of shrubs or small trees in the family Rutaceae and is endemic to Australia. The leaves are arranged alternately, simple and often warty, the flowers arranged singly or in umbels on the ends of branchlets or in leaf axils, usually with five sepals, five petals and ten stamens. There are about thirty species and they are found in all Australian states but not in the Northern Territory.

<i>Bossiaea</i> Genus of legumes

Bossiaea is a genus of about 78 species of flowering plants in the pea family Fabaceae and is endemic to Australia. Plants in this genus often have stems and branches modified as cladodes, simple, often much reduced leaves, flowers with the upper two sepal lobes larger than the lower three, usually orange to yellow petals with reddish markings, and the fruit a more or less flattened pod.

<i>Daviesia</i> Genus of plants

Daviesia, commonly known as bitter-peas, is a genus of about 130 species of flowering plants in the family Fabaceae, and is endemic to Australia. Plants in the genus Daviesia are shrubs or small trees with leaves modified as phyllodes or reduced to scales. The flowers are arranged singly or in groups, usually in leaf axils, the sepals joined at the base with five teeth, the petals usually yellowish with reddish markings and the fruit a pod.

<span class="mw-page-title-main">Dodonaeoideae</span> Subfamily of flowering plants

Dodonaeoideae is a subfamily of flowering plants in the soapberry family, Sapindaceae.

<i>Zehneria</i> Genus of flowering plants

Zehneria is a genus of flowering plants – of vines in the cucumber and gourd family, Cucurbitaceae. It contains about 35 species ranging from Africa, through Southeast Asia to Australia and Oceania. The name honours botanical artist Joseph Zehner.

<i>Dodonaea microzyga</i> Species of flowering shrub

Dodonaea microzyga, commonly known as brilliant hopbush, is a dioecious spreading shrub in the family Sapindaceae. It grows between 0.3 and 1.5 metres tall.

<i>Diplopeltis huegelii</i> Species of flowering plant

Diplopeltis hueglii is a shrub species in the soapberry family, Sapindaceae. It is endemic to Western Australia. Plants grow to between 0.1 and 1.5 metres high. White, pink or purple flowers are produced between April and December in the species' native range.

<i>Dodonaea procumbens</i> Species of flowering plant

Dodonaea procumbens, commonly known as trailing hop bush or creeping hop-bush, is a species of shrub in the genus Dodonaea found in eastern Australia. It occurs in many places in Australia such as South Australia, New South Wales and Victoria. Although the information on the abundance of this species is limited, it is estimated that about 5,000 plants occur in about 55 wild populations. The species is currently facing many threats such as the expansion of road facilities, the development of residential and agricultural areas, increased grazing regimes, weed invasions, and regimes changing of fire. As a result, it is listed as vulnerable and threatened. Therefore, it is necessary to provide protective solutions for the long-term development and survival of this species.

<span class="mw-page-title-main">Sapindoideae</span> Subfamily of flowering plants

Sapindoideae is a subfamily of flowering plants in the soapberry family, Sapindaceae. It includes a number of fruit trees, including lychees, longans, rambutans, and quenepas.

References

  1. "Dodonaea". Australian Plant Census. Retrieved 22 April 2024.
  2. 1 2 "Dodonaea". State Herbarium of South Australia. Retrieved 23 April 2024.
  3. "Dodonaea". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  4. 1 2 Duretto, Marco F. "Dodonaea". Royal Botanic Gardens Victoria. Retrieved 23 April 2024.
  5. 1 2 Wilson, Paul G.; Scott, Andrew J. "Dodonaea". Royal Botanioc Garden, Sydney. Retrieved 23 April 2024.
  6. "Dodonaea". APNI. Retrieved 23 April 2024.
  7. Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 76. ISBN   9780958034180.
  8. "Dodonaea". Plants of the World Online. Retrieved 22 April 2024.
  9. 1 2 3 4 5 6 7 8 9 Harrington, M.; Gadek, P. (December 2009). "A species well travelled – the Dodonaea viscosa (Sapindaceae) complex based on phylogenetic analyses of nuclear ribosomal ITS and ETSf sequences". Journal of Biogeography. 36 (12): 2313–23. doi:10.1111/j.1365-2699.2009.02176.x.
  10. Müller, J.; Leenhouts, P.W. (1976). "A general survey of pollen types in Sapindaceae in relation to taxonomy". In Ferguson, I.K.; Müller, J. (eds.). The evolutionary significance of the exine. Linnean Society Symposium Series. Linnean Society of London. pp. 407–445. ISBN   978-0122536502.
  11. 1 2 West, J.G. (1984). "A revision of Dodonaea Miller (Sapindaceae) in Australia". Brunonia. 7 (1): 1–194. doi:10.1071/BRU9840001.
  12. Leenhouts, P.W.; Vente, M.A. (1982). "Taxonomic revision of Harpullia (Sapindaceae)". Blumea - Biodiversity, Evolution and Biogeography of Plants. 28 (1): 1–51.
  13. Harrington, G.N.; Driver, M.A. (1995). "The effect of fire and ants on the seed-bank of a shrub in a semi-arid grassland". Austral Ecology. 20 (4): 538–547. doi:10.1111/j.1442-9993.1995.tb00573.x.