Arceuthobium minutissimum | |
---|---|
A. minutissimum photographed on Pinus wallichiana in Bhutan | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Santalales |
Family: | Santalaceae |
Genus: | Arceuthobium |
Species: | A. minutissimum |
Binomial name | |
Arceuthobium minutissimum | |
Synonyms [1] | |
Razoumowskia minutissima Tubeuf |
Arceuthobium minutissimum, known as the Indian dwarf mistletoe [2] or Himalayan dwarf mistletoe, is a leafless parasitic plant of Pinus wallichiana . It is considered the smallest known dicotyledonous plant. [3]
Individual shoots grow to a height of 5 millimeters, and up to 1 centimeter with mature fruit. Shoots emerge from both the cortex and needles of the host plant. Flowers are monoecious, and seed dispersal occurs in September. [4]
The species occurs in dry forests of the Himalayan mountains at an approximate altitude of 2500–3500 meters. [4] [5] It has been reported in Nepal, India, Bhutan, and Pakistan. A. minutissimum infects the crowns of trees of all ages. It severely impacts the health of host-trees, and causes the loss of needles. [6] Although P. wallichiana is the primary host, it has been recorded to infect Pinus gerardiana in Pakistan. Unconfirmed reports show that it may also infect Abies pindrow and Cedrus deodara . [4]
It has been considered that there is potential for A. minutissimum to become an invasive species in Europe. [6]
Mistletoe is the common name for obligate hemiparasitic plants in the order Santalales. They are attached to their host tree or shrub by a structure called the haustorium, through which they extract water and nutrients from the host plant.
Pinus wallichiana is a coniferous evergreen tree native to the Himalaya, Karakoram and Hindu Kush mountains, from eastern Afghanistan east across northern Pakistan and north west India to Yunnan in southwest China. It grows in mountain valleys at altitudes of 1800–4300 m, reaching 30–50 m (98–164 ft) in height. It favours a temperate climate with dry winters and wet summers. In Pashto, it is known as Nishtar.
The genus Arceuthobium, commonly called dwarf mistletoes, is a genus of 26 species of parasitic plants that parasitize members of Pinaceae and Cupressaceae in North America, Central America, Asia, Europe, and Africa. Of the 42 species that have been recognized, 39 and 21 of these are endemic to North America and the United States, respectively. They all have very reduced shoots and leaves with the bulk of the plant living under the host's bark. Recently the number of species within the genus has been reduced to 26 as a result of more detailed genetic analysis.
Pinus roxburghii, commonly known as chir pine or longleaf Indian pine, is a species of pine tree native to the Himalayas. It was named after William Roxburgh.
Pinus gerardiana, commonly known as the chilghoza pine or neja is a pine native to the northwestern Himalayas in Afghanistan, northern Pakistan, Waziristan and northwestern India, growing at elevations of 1,800–3,350 metres (5,910–10,990 ft). It often occurs in association with Cedrus deodara and Pinus wallichiana.
The smallest organisms found on Earth can be determined according to various aspects of organism size, including volume, mass, height, length, or genome size.
Pinus douglasiana is a species of evergreen conifer in the family Pinaceae. It is found only in Mexico.
Arceuthobium americanum is a species of dwarf mistletoe known as American dwarf mistletoe and lodgepole-pine dwarf mistletoe. It is a common plant of western North America where it lives in high elevation pine forests. It is a parasitic plant which lives upon the Lodgepole Pine, particularly the subspecies Pinus contortus ssp. murrayana, the Tamarack Pine. This pine subspecies is most common in the Cascade Range and Sierra Nevada. The American dwarf mistletoe is a yellow-green coral-shaped structure above the surface of the tree's bark, while most of the parasite is beneath the bark. The seeds mature in late summer and disperse to nearby trees. This species has been found to explosively-disperse its seeds through thermogenesis.
Arceuthobium abietinum is a species of dwarf mistletoe known as fir dwarf mistletoe. It is native to western North America from Washington to New Mexico to northern Mexico, where it lives in coniferous forests as a parasite on various species of fir, particularly white fir, giant fir, and red fir. This is a small shrub which is visible as a network of scaly yellowish stems extending above the bark of its host tree. Most of the mistletoe is located inside the host tree, attached to it via haustoria, which tap the tree for water and nutrients. The leaves of the mistletoe are reduced to knobby scales on its surface. It is dioecious, with male and female mistletoe plants producing spikes of staminate and pistillate flowers, respectively. The fruit is a sticky berry a few millimeters long which explodes to disperse the seeds it contains several meters away from the parent plant and its host tree.
Arceuthobium divaricatum is a species of dwarf mistletoe known as pinyon dwarf mistletoe.
Arceuthobium douglasii is a species of dwarf mistletoe known as Douglas fir dwarf mistletoe. It is native to western North America from British Columbia to Texas to California, where it lives in forest and woodland as a parasite. It is found mostly on Douglas fir trees, but occasionally on fir, as well.
The Western Himalayan subalpine conifer forests is a temperate coniferous forests ecoregion of the middle and upper elevations of the western Middle Himalayas of Nepal, India, and Pakistan.
Deodar forests are forests dominated by Cedrus deodara, the deodar cedar. This tree is found naturally in the Western Himalayas from the Gandaki River in central Nepal to the Hindu Kush mountain range in Afghanistan.
Phoradendron tomentosum, the leafy mistletoe, hairy mistletoe or Christmas mistletoe, is a plant parasite. It is characterized by its larger leaves and smaller berries than dwarf mistletoe. Leafy mistletoe seldom kill but they do rob their hosts of moisture and some minerals, causing stress during drought and reducing crop productions on fruit and nut trees. Leafy mistletoe has the ability to photosynthesize on its own but it relies on other plants in order to obtain its nutrients. It attaches itself to a tree and then grows haustoria, in order to get the food and water it needs.
Dioryctria taiella is a species of snout moth in the genus Dioryctria. It was described by Hans Georg Amsel in 1970 and is known from Afghanistan and Pakistan.
Arceuthobium oxycedri, juniper dwarf mistletoe, is a hemiparasite of the family Santalaceae. It parasitizes members of the genus Juniperus, especially Juniperus oxycedrus and Juniperus communis.
Arceuthobium gillii, common name "Chihuahua pine dwarf mistletoe," is a parasitic plant found in Arizona, New Mexico, Chihuahua, Sonora and Sinaloa. It is found mostly on the Chihuahua pine, Pinus leiophylla var. chihuahuana.
Arceuthobium vaginatum, called the "sheathed dwarf mistletoe" or "southwestern dwarf mistletoe" is a parasitic plant found in the southwestern United States and northwestern and central Mexico. It generally is found on pine trees.
Arceuthobium pusillum is a perennial, obligate parasitic plant in the sandalwood family. Its common names include Dwarf mistletoe or Eastern dwarf mistletoe. It is one of the most widespread dwarf mistletoes within its range which covers the eastern United States and Canada, from Saskatchewan to Nova Scotia and New Jersey. The species name "pusillum" derives from Latin "pusillus", meaning very small.