Lysiana exocarpi | |
---|---|
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Santalales |
Family: | Loranthaceae |
Genus: | Lysiana |
Species: | L. exocarpi |
Binomial name | |
Lysiana exocarpi | |
Subspecies | |
L. exocarpi subsp. exocarpi Contents | |
Occurrence data from AVH | |
Synonyms | |
Lysiana exocarpi, commonly known as harlequin mistletoe, is a species of hemiparasitic shrub, endemic to Australia. It is in the Gondwanan family Loranthaceae and is probably the most derived genus of that family with 12 pairs of chromosomes. [3] The Loranthaceae is the most diverse family in the mistletoe group with over 900 species worldwide and including the best known species in Australia. [4] Mistletoes are notable for their relationships with other species. In an early reference to the group in Australia Allan Cunningham explorer and first Director [5] of the Royal Botanic Gardens, Sydney, wrote in 1817: "The Bastard Box [note 1] is frequently much encumbered with the twining adhering Loranthus aurantiacus [6] (box mistletoe) which 'Scorning the soil, aloft she springs, Shakes her red plumes and claps her golden wings'." [7]
Spreading to shrub, glabrous; no external runners. Leaves flat or compressed when very narrow, linear to narrow-oblong, sessile or the wider leaves shortly petiolate, 3–15 cm long, 1–10 mm wide, apex is usually rounded, base attenuate - contracted, venation is obscure; shortly petiolate. Inflorescence pedunculate usually a 2-flowered umbel; peduncle usually 0.5–2 mm in length; pedicels 2–5 mm long; bracts 1–1.5 mm long. Corolla 25–50 mm long, is usually red, rarely yellow, can also be tipped with green or black. Fruit ellipsoidal to ovoid, 6–10 mm long, red or black. [8]
Leaves are linear to narrow-oblong or narrow-elliptic and occasionally obcordate, 3–10 mm wide, often thick or leathery at maturity. Plant spreading to pendent. Mostly parasitic on species of Acacia , Alectryon, Amyema , Cassia, Casuarinaceae, Eremophila, Exocarpos , and exotic trees, west from Moree district. [9] Synonym: L. exocarpi subsp. diamantinensis [10]
Leaves linear, 1–3 mm wide, not terete but sometimes compresses. Plant is pendent. It is found in open woodland and forest, usually on species of Casuarinaceae, north from the Hunter Valley [11] First described in 1925 by Blakely as Loranthus exocarpi var. tenuis [12] and revised by Barlow in 1963 to Lysiana exocarpi subsp.tenuis. [13]
Lysiana species can be broadly grouped into those that have 80-90 units of DNA and those that have greater than 100 units. L. exocarpi is the only species that extends its range into temperate non-arid regions, with DNA values predominantly above 100, the average being 117 units. [14]
Open woodland and forest, extending into semi-arid woodlands dominated by acacia. [16]
L. exocarpi: Occurs in arid and temperate regions of all mainland States, from Lake Carnegie, W.A, to the Hunter Valley, NSW, in open forest and woodland on many different hosts but frequently on other Loranthaceae.
L. exocarpi subsp. exocarpi: Occurs in arid and temperate Australia from Lake Carnegie, Q.A., to western Qld and central Vic; on many host species, most frequently on Acacia , Amyema , Cassia , Casuarinaceae, Eremophila , Exocarpos , Alectryon and exotic trees. A polymorphic subspecies, with a cline towards wider and thicker leaves from temperate to arid habitats.
L. exocarpi subsp. tenuis: Occurs in Qld and NSW from the Darling Downs to the Hunter Valley and inland to the Western Plains, in open woodland and forest, usually on Casuarinaceae. [17]
Flowering occurs mainly in summer. Charles Brittlebank (1908) noted that germination "usually takes place in one to two days, but may be delayed in some cases for a period of 50 days". [18]
Life span - 4 to 20 years. First seeds - 2 to 3 years. Adult fire response - greater than a 70% mortality when subject to total leaf scorch. Resprouting - none. [19]
Mistletoes generally have green or green-yellow coloured leaves and stems and photosynthesise. However, they use the water supply of the host plant and the water-soluble nutrients in the water (sap). For this reason, they are considered to be semi-parasites. Attachment to the host plant is by means of one or more woody absorbing organs (haustoria). This organ effectively replaces the root system of a normal plant, and extends through the bark layers of the host and into the young wood zone, where most of the water transport occurs. [20]
Mistletoes often have foliage that mimics the host plant. [21]
Lysiana exocarpi is known to epiparasitise [22] other mistletoes, namely Amyema species: A. maidenii, A. miquelii (box mistletoe), A. quandang [23]
In New South Wales the most common hosts are species of Eucalyptus and Acacia and also Flindersia, Pittosporum, Santalum [24] In a comprehensive study of Australian herbaria specimens, Paul Downey found that the host plants for Australian mistletoes were mostly dicotyledonous angiosperms with a small number of gymnosperms in the genera Araucaria , Callitris and Pinus . No host species were herbaceous. Every host family and genus recorded contained species which were not documented as mistletoe host species. The two major genera of host species were Eucalyptus and Acacia with 2084, and 2559 records respectively. There were 187 species of Eucalyptus and 150 species of Acacia. Seven mistletoe species commonly parasitised exotic host species including L. exocarpi. The commonly recorded exotic host species included Nerium oleander , Citrus spp., Prunus spp., Schinus molle and Quercus spp. L. exocarpi was found in 901 records and 109 species. The host families were Apocynaceae, Caesalpiniaceae, Capparaceae, Casuarinaceae, Chenopodiaceae, Fabaceae, Fagaceae, Loranthaceae, Malvaceae, Meliaceae, Mimosaceae, Moraceae, Myoporaceae, Myrtaceae, Oleaceae, Pittosporaceae, Polygonaceae, Proteaceae, Rhamnaceae, Rutaceae, Santalaceae, Sapindaceae, Solanaceae and Zygophyllaceae. [23] In a 1990 study of L. exocarpi subsp. exocarpi in Southern South Australia, Yan found that this species showed a specific preference for Alectryon oleifolius and Myoporum platycarpum supporting Barlow's view that all Australian mistletoes of open forest and woodland are host specific to some extent. He also found that rainfall was a determining factor in regulating the distribution. [25]
Interactions between mistletoes and animals have long been noted and were used by Charles Darwin as early exemplars of evolutionary adaptation with Carl Linnaeus credited as the first to describe the mistletoe life cycle. Pliny the Elder had recorded similar observations some 1600 years earlier. Most species of mistletoe are dispersed by animals, chiefly birds and this close relationship has been treated as a model system in the study of fruit dispersal generally. Many insects pollinate mistletoes primarily in the Coleoptera, Diptera, Hymenoptera and Lepidoptera. [26]
At least 27 species of Australian butterflies use mistletoes as their host plant. The two groups are the jezebels (Pieridae) and azures (Lycaenidae). Upon hatching, the caterpillars subsist and grow entirely on the foliage. Although some species drop off to pupate in the ground beneath, most remain in the clump attaching their chrysalis to the tips of denuded twigs or burrowing into the junction between mistletoe and the host tree to evade predators. L. exocarpi is a host plant for Ogyris aenone [27] and is a popular food plant for nectar feeding birds when in full flower. [28]
The mistletoe fruit is a single-seeded berry, often brightly coloured, with striking adaptations for bird dispersal, germination and attachment. Under the outer coat of the fruit is a sticky layer of viscin, which is rich in glucose, and which envelops the seed. Birds which feed on the fruits often have specialized feeding behaviour, swallowing the seed whole after squeezing it from the fruit coat. Birds have been reported nipping the end off the fruit, as though removing a cap, prior to squeezing out the seed. Notable dispersal agents are the mistletoebird ( Dicaeum hirundinaceum ), [29] and some honeyeaters in Australia ( Grantiella , Acanthagenys , Plectorhyncha )
According to Les Hiddins, Aboriginal people would eat the fruit without chewing so they wouldn't stick to the tongue. [30] The ripeness of the berry is indicated not only by its softness, but often also by a slight translucence. When quite ripe the sticky, gelatinous, sweet pulp surrounding the single seed is pleasant to eat, but its great stickiness often make the seed almost impossible to spit out. Birds have the same difficulty and may sometimes be seen wiping their beaks free of seeds against the branch of a tree. [31] Jennifer Isaacs lists berries of L. exocarpi and L.spathulata as being eaten in the Central desert [32] Peter Latz notes that the calories obtained would be rather low. Aborigines often pluck whole branches from the tree and pick off the berries at their leisure. These berries are particularly favored by children. Although all Aboriginal groups have two or more names for mistletoes, it appears that they do not give separate names to each species. The Walpiri word for both L. murrayi and L. spathulata is pawurlirri. [33] The Antakirinja people around Coober Pedy call the berries of L. exocarpi Ngantja. [34] Reference to the fruit was first contained in a letter written by Governor Gawler during an ill-fated expedition in 1839 led by Charles Sturt. Gawler to his brother-in-law, Henry Cox, 20 December 1839: "The poor boy (Henry Bryan) accompanied me most cheerfully, he had been resting all day and did not appear to suffer from the subsequent exertion. He brought me the pulpy but bitter fruit of the mesembryantheumum and the little berries of the exocarpi - and ate plenty of them himself - he made many observations about our course, appearing to recollect its striking features well, and calculated our distances with much precision". [35]
In Europe mistletoe leaves and young twigs are used by herbalists, especially in Germany, for treating circulatory and respiratory system problems. Mistletoe extract is sold as Iscador, Helixor, and several other trade names. Use of mistletoe extract in the treatment of cancer originated with Rudolf Steiner, the founder of Anthroposophy. He compared the parasitic nature of the mistletoe plant to that of cancer, and believed that cancer represents a faltering of the body's spiritual defenses. Public interest in the United States was spurred in 2001 following actress Suzanne Somers' decision to use Iscador in lieu of chemotherapy following her treatment for breast cancer. Available clinical evidence, however, does not support claims of anti-cancer effect, quality of life, or other outcomes from the use of mistletoe extract. [36] In 2007 researchers from Griffith University in Queensland found that a new natural product, lysianadioic acid, isolated from Lysiana subfalcata(in the same genus [37] [ citation needed ]) was a carboxypeptidase B (CPB) inhibitor. It is a potent inhibitor of CPB with an IC50 of 0.36 lM. This is the first known example of a small molecule CPB inhibitor isolated from plant origin. [38]
L. exocarpi was first collected from Spencer's Gulf in 1802 by Robert Brown. [39] It was first described as Loranthus exocarpi by Hans Hermann Behr in 1847 [40] after his first visit to Australia 1844–45. Behr was the first botanist to systematically collect and study the flora of the Barossa Range, mallee scrubs towards the River Marne and areas adjacent to the River Murray at Moorundie. Dietrich von Schlechtendahl treated 200 plants collected by Behr, of which he described 62 as being new species: a further five, including Loranthus exocarpi were described by Behr. [41] In 1894 Philippe Édouard Léon Van Tieghem published a revision of Loranthus and created a new genus Lysiana. The name is based on the Greek lyo - "I set free" - referring to the separation of the genus from Loranthus. [42]
Amyema is a genus of semi-parasitic shrubs (mistletoes) which occur in Malesia and Australia.
Amyema miquelii, also known as box mistletoe, is a species of flowering plant, an epiphytic hemiparasitic plant of the family Loranthaceae, found attached to several species of Australian eucalypt and occasionally on some species of Acacia. It is the most widespread of the Australian Mistletoes, occurring mainly to the west of the Great Dividing Range. It has shiny leaves and red flowers arranged in groups of 3. It is distinguished from the similar Amyema pendula through the individual stalks of the flowers.
Amyema quandang is a species of hemi-parasitic shrub which is widespread throughout the mainland of Australia, especially arid inland regions, sometimes referred to as the grey mistletoe.
Amyema congener, commonly known as the variable mistletoe, is a species of flowering plant, an epiphytic hemiparasitic plant of the family Loranthaceae from eastern Australia. It is found on members of the genera Allocasuarina, Acacia and some exotic species.
Acacia argyrodendron, known colloquially as black gidyea or blackwood, is a species of Acacia native to Australia. Czech botanist Karel Domin described this species in 1926 and it still bears its original name. Domin reported collecting the type specimen from somewhere between Camooweal and Burketown in northwestern Queensland, though it is more likely to have been northeast of Aramac.
Amyema preissii, commonly known as wireleaf mistletoe, is a species of mistletoe, an epiphytic, hemiparasitic plant of the family Loranthaceae. It is native to Australia where it has been recorded from all mainland states. The flowers are red and up to 26 mm long. The fruits are white or pink, globose and 8–10 mm in diameter. Its habitat is sclerophyll forest and woodland where it is often found on wattles. On Victoria's Bellarine Peninsula its hosts include coast wirilda, golden wattle and drooping sheoak. Its sticky seeds are eaten and dispersed by mistletoebirds.
Amyema benthamii, commonly known as the twin-leaved mistletoe or Bentham's mistletoe, is a species of flowering plant, an epiphytic hemiparasitic plant of the family Loranthaceae native to Western Australia and the Northern Territory of Australia in semi-arid woodland. This species is named in honour of the English botanist George Bentham who between 1863 and 1878 published Flora Australiensis, the first flora of Australia.
Atkinsonia is a hemi-parasitic shrub with oppositely set, entire leaves and yellowish, later rusty-red colored flowers, that is found in Eastern Australia. It is a monotypic genus, the only species being Atkinsonia ligustrina, and is assigned to the showy mistletoe family, Loranthaceae. It is sometimes called Louisa's mistletoe.
Muellerina eucalyptoides, commonly known as creeping mistletoe, is a hemiparasitic aerial shrub in the family Loranthaceae. The species is endemic to Australia.
Amyema bifurcata is an epiphytic, flowering, hemiparasitic plant of the family Loranthaceae native to Australia and found in Western Australia, the Northern Territory, Queensland and New South Wales.
Amyema maidenii is a species of flowering plant within the genus Amyema, an epiphytic hemiparasitic plant of the family Loranthaceae native to Australia and found Australia-wide in the inland.
Amyema mackayensis, the mangrove mistletoe, is a species of flowering plant within the genus Amyema, an epiphytic hemiparasitic plant of the family Loranthaceae native to Australia, and found along its northern and eastern coasts in New South Wales, Queensland, the Northern Territory and Western Australia, and also in New Guinea.
Amyema fitzgeraldii, the pincushion mistletoe, is a species of flowering plant within the genus Amyema, an epiphytic hemiparasitic plant of the family Loranthaceae endemic to Australia, and found in the Northern Territory, South Australia and Western Australia.
Amyema sanguinea is an aerial hemiparasitic shrub within the genus Amyema, in the family Loranthaceae and native to Australia, where it is found in New South Wales, Queensland, the Northern Territory, South Australia and Western Australia.
Amyema melaleucae, also known as the tea-tree mistletoe, is a species of flowering plant within the genus Amyema, an epiphytic hemiparasitic plant of the family Loranthaceae native to Australia and found in Western Australia and South Australia on the coast, from north of Perth almost to the Victorian border.
Lysiana murrayi is an erect or spreading hemi-parasitic shrub in the Loranthaceae which occurs in all mainland states of Australia except Victoria. It has flat narrow leaves. The leaves are 2.5–6 cm long, 1–3.5 mm wide, do not have a distinct petiole, and the venation is not visible. The inflorescence is a solitary flower or pair of flowers without a common peduncle. The pedicels are 8–20 mm long, and strongly winged towards the apex. The spreading, membranous bracts are 2–3 mm long, and rounded at the apex. The corolla of the mature bud is usually 18–28 mm long, and white, yellow or pink. The fruit is globose, 7–12 mm long, and pink or red.
Lysiana subfalcata, common name Northern mistletoe, is a spreading to pendulous hemi-parasitic shrub in the Loranthaceae which occurs in all mainland states of Australia except Victoria.
Amyema cambagei, commonly known as sheoak mistletoe, is a species of flowering plant, an epiphytic hemiparasitic plant of the family Loranthaceae endemic to Australia, and found in New South Wales and Queensland in sclerophyll forest and woodland on several species of Casuarinaceae.
Amyema plicatula is a species of hemi-parasitic shrub found in the Bismarck Archipelago, New Guinea, New South Wales and Queensland.
Amyema miraculosa, also known as the fleshy mistletoe and the round-leaf mistletoe, is an Australian native mistletoe found in all states except Tasmania. It is a woody, hemiparasitic plant, in the Loranthaceae family. Being hemiparasitic, it draws water and minerals from its host, however it photosynthesises to manufacture its own supply of carbohydrates.