Tamarix

Tamarisk redirects here. For other uses of tamarisk, see Tamarisk (disambiguation)

Tamarix
Tamarix aphylla in its natural habitat in Israel
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Caryophyllales Family: Tamaricaceae Genus: Tamarix L.
Species
See text

The genus Tamarix (tamarisk, salt cedar) comprises about 50-60 species of flowering plants in the family Tamaricaceae, native to drier areas of Eurasia and Africa.^[1]

They are evergreen or deciduous shrubs or trees growing to 1-18 m in height and forming dense thickets, The largest, Tamarix aphylla, is an evergreen tree that can grow to 18 m tall. They usually grow on saline soils, tolerating up to 15,000 ppm soluble salt and can also tolerate alkali conditions. Tamarisks are characterized by slender branches and grey-green foliage. The bark of young branches is smooth and reddish-brown. As the plants age, the bark becomes bluish-purple, ridged and furrowed. The leaves are scale-like, 1-2 mm long, and overlap each other along the stem. They are often encrusted with salt secretions. The pink to white flowers appear in dense masses on 5-10 cm long spikes at branch tips from March to September, though some species (e.g. T. aphylla) tend to flower during the winter.

Tamarix can spread both vegetatively, by adventitious roots or submerged stems, and sexually, by seeds. Each flower can produce thousands of tiny (1 mm diameter) seeds that are contained in a small capsule usually adorned with a tuft of hair that aids in wind dispersal. Seeds can also be dispersed by water. Seedlings require extended periods of soil saturation for establishment. Tamarix species are fire-adapted, and have long tap roots that allow them to intercept deep water tables and exploit natural water resources. They are able to limit competition from other plants by taking up salt from deep ground water, accumulating it in their foliage, and from there depositing it in the surface soil where it builds up concentrations temporarily detrimental to some plants. The salt is washed away during heavy rains. Tamarix trees are most often propagated by cuttings.

Tamarix species are used as food plants by the larvae of some Lepidoptera species including Coleophora asthenella which feeds exclusively on T. africana.

Selected species

Tamarix africana Tamarix androssowii Tamarix aphylla Tamarix arceuthoides Tamarix austromongolica       Tamarix boveana Tamarix canariensis Tamarix chinensis Tamarix dalmatica Tamarix dioica Tamarix elongata Tamarix gallica Tamarix gansuensis Tamarix gracilis Tamarix hampeana Tamarix hispida       Tamarix hohenackeri Tamarix indica Tamarix jintaenia Tamarix juniperina Tamarix karelinii Tamarix laxa Tamarix leptostachys Tamarix meyeri Tamarix mongolica Tamarix parviflora Tamarix ramosissima Tamarix sachuensis Tamarix smyrnensis Tamarix taklamakanensis Tamarix tarimensis Tamarix tenuissima Tamarix tetrandra

Tamarix gallica in flower A Tamarix aphylla species in natural habitat in Algeria

Key to five species

How to tell the difference between five selected Tamerix species (T. aphylla, T. chinensis, T. gallica, T parvifolia, and T. ramosissima) using a dichotomous key;^[2]

Step 1

1 .   If the twig-leaves are not overlapping, but are strongly clasping and abruptly pointed; and if the sepals are more or less round, than what you have is a Tamarix aphylla.

1' .   But if the twig-leaves are overlapping, not clasping and acute to long-acuminate; and if the sepals are elliptic to ovate, then you may have a T. chinensis, T. gallica, T parvifolia, or a T. ramosissima.

Step 2

2 .   If the flower has sepals, petals and stamens all numbering four each, than what you have is a Tamarix parviflora.

2' .   But if the sepals, petals, and stamens number five each, then you may have a T. chinensis, T. gallica, or a T. ramosissima.

Step 3

3 .   If the nectar disk lobes are longer than they are wide, and confluent with filaments, then what you have is a Tamarix gallica.

3' .   But if the nectar disk lobes are wider than they are long, and with alternate filaments, then you either have a T. chinensis, or a T. ramosissima.

Step 4

4 .   If the leaves are oblong to narrowly lanceolate, and acute; and the sepals entire, then what you have is a Tamarix chinensis.

4' .   But if the leaves are ovate, and acute to acuminate; and the sepals are minutely toothed, then what you have is a Tamarix ramosissima.

Tamarix in North America

The Tamarix was introduced to the United States as an ornamental shrub, a windbreak, and a shade tree in the early 1800s. In the 1930s, during the Great Depression, tree-planting was used as a tool to fight soil erosion on the Great Plains, and the trees were planted by the millions.^[3] [1]

Eight species are found in North America. They can be divided into two sub-groups. The Tamarix aphylla, or Athel tree, a large evergreen tree, does not sexually reproduce in the local climate and is not considered a seriously invasive species. The Athel tree is commonly used for windbreaks on the edge of agricultural fields and as a shade tree in the deserts of the Southwestern United States. The second sub-group contains the deciduous tamarisks, which are small shrubby trees, commonly known as "saltcedars." These include the Tamarix pentandra, Tamarix tetranda, Tamarix gallica, Tamarix chinensis, Tamarix ramosissima, and Tamarix parvifolia.[2]

These trees establish themselves in disturbed and undisturbed streams, waterways, bottom lands, banks and drainage washes of natural or artificial water bodies, moist rangelands and pastures, and other areas where seedlings can be exposed to extended periods of saturated soil for establishment.

It is commonly believed that Tamarix disrupts the structure and stability of North American native plant communities and degrades native wildlife habitat by outcompeting and replacing native plant species, salinizing soils, monopolizing limited sources of moisture, and increasing the frequency, intensity and effect of fires and floods. While it has been shown that individual plants may not consume larger quantities of water than native species (Anderson, 1996,1998) it has also been shown that large dense stands of Tamarix do consume more water than equivalent stands of native cottonwoods (Sala 1996). There is an active and ongoing debate as to when Tamarix can out-compete native plants and if it is actively displacing native plants or it just taking advantage of disturbance by removal of natives by humans and changes in flood regimes (Cooper 1999) (Cooper 2003) (Everitt 1980)(Everitt 1998)(Stromberg 1998). Research on competition between Tamarix seedlings and co-occurring native trees has found that the seedlings are not competitive over a range of environments (Sher, Marshall & Gilbert 2000)(Sher, Marshall & Taylor 2002)(Sher & Marshall 2003), however stands of mature trees effectively prevent native species establishment in the understory, due to low light, elevated salinity, and possibly changes to the soil biota (e.g. (Busch & Smith 1995) and (Taylor & McDaniel 1998). Thus, anthropogenic activities that preferentially favor tamarisk (such as changes to flooding regimes) are associated with infestation (Shafroth, Stromberg & Patten 2000) (Merritt & Cooper 2000) (Horton, Kolb & Hart 2001). To date, Tamarix has taken over large sections of riparian ecosystems in the Western United States that were once home to native cottonwoods and willows (Christensen 1962) (Stromberg 1998) (Zamora 2001) (Zavaleta 2000), and are projected by some to spread well beyond the current range (Morisette 2006).

There are several ways to deal with pest populations of tamarisk in the United States. The National Park Service has used physically removing the plants, spraying them with herbicides, and introducing the "Tamarisk Beetle" in the National Park System. This has been done in the Dinosaur National Monument in Utah and Colorado along the Green and Yampa Rivers during the summers of 2006 and 2007. After decades of study the National Park Service has found that the Tamarisk Beetles eat only the tamarisk and starve when there is no more tamarisk to feed upon. No other native North American plants have been found to be eaten by the introduced Tamarisk Beetle. Progress is slow but proves that containment of the Tamarisk is possible in the long term.^[4]

Uses

• The tamarisk is used as an ornamental shrub, a windbreak, and a shade tree. The wood may be used for carpentry or firewood. It is a possible agroforestry species.^[4]
• Plans are being made for the tamarisk to play a role in anti-desertification programs in China.^[5],^[6]
• Saltcedars can be planted to mine salts, then be used in the production of fuel and fertilizer (although the latter will be somewhat salty).^[7]

A wrapped piece of Gaz, with the wrapper removed below

Gaz Gaz (candy) is the traditional name of Persian nougat originating from the city of Esfahan, located in the central plateau of Iran.

The name Gaz is associated with gaz-angebin which translates to "sap of angebin"; a desert plant member of the Tamarisk family and native to the Zagros mountain range located to the west of the city.

The sweet, milky sap of the angebin plant is associated with manna, a food mentioned in the religious texts of the Abrahamic religions. This sap is collected annually and is combined with other ingredients including pistachio or almond kernels, rosewater and egg white. This combination of ingredients give Gaz its distinctive flavor, rendering it unique when compared to European nougats.

Cultural History

In the Quran 35:16, The people of Saba were punished when "[Allah] converted their two garden (rows) into gardens producing bitter fruit and tamarisks [...]"

In Genesis 21:33, Abraham is recorded to have "planted a tamarisk at Beer-sheba". He had built a well there, earlier.

In a campaign in the computer game, Age of Mythology, the head of Osiris is said to be hidden inside the trunk of a great Tamarisk tree.

Wedgwood made a “Tamarisk” China pattern.

According to The New Larousse Encyclopedia of Mythology, the tamarisk plant is a favorite of the Greek God, Apollo.

See also

Nougat

References

This section needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (February 2008)

Further reading

This article may require cleanup to meet Wikipedia's quality standards. Please improve this article if you can. (March 2008)

• Anderson, B. W. (1996), "Salt cedar, revegetation and riparian ecosystems in the Southwest.", Proceedings of the California Exotic Pest Plant Council, Symposium '95. California Exotic Pest Plant Council, Pacific Grove, California.: 32–41 .
• Anderson, B. W. (1998), "The case for salt cedar.", Restoration and Management Notes 16: 130–134, 138 .
• Cooper, D. (1999), "Factors Controlling the Establishment of Fremont Cottonwood Seedlings on the Upper Green River, USA", Regul. Rivers: Res. Mgmt. 15: 419–440, doi:10.1002/(SICI)1099-1646(199909/10)15:5<419::AID-RRR555>3.0.CO;2-Y .
• Cooper, D. (2003), "Multiple pathways for woody plant establishment on floodplains at local to regional scales.", Journal of Ecology 91: 182–196, doi:10.1046/j.1365-2745.2003.00766.x .
• Christensen, E. M. (1962), "The Rate of Naturalization of Tamarix in Utah.", American Midland Naturalist 68 (1): 51–57, doi:10.2307/2422635 .
• Everitt, B. L. (1980), "Ecology of Saltcedar - A plea for research.", Environmental Geology 3 (3): 77–84, doi:10.1007/BF02473474 .
• Everitt, B. L. (1998), "Chronology of the spread of Tamarisk in the central Rio Grande.", Wetlands (18): 658–668 .
• Stromberg, J. C. (1998), "Dynamics of Fremont cottonwood (Populus fremontii) and saltcedar (Tamarix chinesis) populations along the San Pedro River, Arizona", Journal of Arid Environments 40 (40): 133–155, doi:10.1006/jare.1998.0438 .
• Stromberg, J. C. (1998), "Functional equivalency of saltcedar (Tamarix chinensis) and Fremont cottonwood (Populus fremontii) along a free-flowing river.", Wetlands (18): 675–686 .
• Zamora-Arroyo, F. (2001), "Regeneration of native trees in response to flood releases from the United States into the delta of the Colorado River, Mexico.", Journal of Arid Environments 49 (49): 49–64, doi:10.1006/jare.2001.0835 .
• Zavaleta, E. (2001), "The Economic Value of Controlling an Invasive Shrub", Ambio (8): 462–467 .

• Gilbert (2000), "Competition between native Populus deltoides and invasive Tamarix ramosissima and the implications of reestablishing flooding disturbance.", Conservation Biology 14: 1744–1754, doi:10.1046/j.1523-1739.2000.99306.x .

• Sher (2002), "Spatial partitioning within southwestern floodplains: patterns of establishment of native Populus and Salix in the presence of invasive, non-native Tamarix.", Ecological Applications 12: 760–772 .

• Sher (2003), "Competition between native and exotic floodplain tree species across water regimes and soil textures.", American Journal of Botany 90: 413–422, doi:10.3732/ajb.90.3.413 .

• Bush (1995), "Mechanisms associated with decline of woody species in riparian ecosystems of the southwestern U.S.", Ecological Monographs 65: 347–370, doi:10.2307/2937064 .

• Taylor (1998), "Restoration of saltcedar (Tamarix sp.)-infested floodplains on the Bosque del Apache National Wildlife Refuge.", Weed Technology 12: 345–352 .

• Shafroth (2000), "Woody riparian vegetation response to different alluvial water table regimes.", Western North American Naturalist 60: 66–76 .

• Meritt (2000), "Riparian vegetation and channel change in response to river regulation: A comparative study of regulated and unregulated streams in the Green River Basin, USA.", Regulated Rivers: Research and Management 16: 543–564, doi:10.1002/1099-1646(200011/12)16:6<543::AID-RRR590>3.0.CO;2-N .

• Horton (2001), "Responses of riparian trees to interannual variation in ground water depth in a semi-arid river basin", Plant, Cell and Environment 24: 293–304, doi:10.1046/j.1365-3040.2001.00681.x .

External links

Wikimedia Commons has media related to: Tamarix

Wikisource has the text of the 1911 Encyclopædia Britannica article Tamarisk.

• Flora Europaea Tamarix
• Flora of China Tamarix species list
• U.S. NPS guide
• Tamarix (Genus) zipcodezoo.com
• Exotic Tamarisk on the Colorado Plateau
• Tamarix, a natural resource on which the communities depend for fuelwood, tools, and basket making.
• Afforestation and Salinity Control Using Tamarix; in Western China
• Introduction of the Tamarisk Beetle in Dinosaur National Monument