Artemisia tridentata explained

Artemisia tridentata, commonly called big sagebrush,[1] Great Basin sagebrush[1] or simply sagebrush (one of several related species of this name), is an aromatic shrub from the family Asteraceae.

It grows in arid and semi-arid conditions, throughout a range of cold desert, steppe, and mountain habitats in the Intermountain West of North America. Big sagebrush and other Artemisia shrubs are the dominant plant species across large portions of the Great Basin.

Sagebrush provides food and habitat for a variety of species, such as sage grouse, pronghorn antelope, grey vireo, pygmy rabbit, and mule deer. Several major threats exist to sagebrush ecosystems, including human settlements, conversion to agricultural land, invasive plant species, and wildfires.

Native Americans have used the plant medicinally. It is also useful as firewood.

Description

Big sagebrush is a coarse, many-branched, pale-grey shrub with yellow flowers and silvery-grey foliage, which is generally NaNabbr=offNaNabbr=off tall.[2] A deep taproot NaNabbr=onNaNabbr=on in length, coupled with laterally spreading roots near the surface, allows sagebrush to gather water from both surface precipitation and the water table several meters beneath. Big sagebrush that is over a meter tall is an indicator of arable land, because it prefers deep, basic soils.[3] Sagebrush is generally long-lived once it makes it past the seedling stage, and can reach ages of over 100 years.[4]

The species has a strong pungent fragrance (especially when wet) due to the presence of camphor, terpenoids and other volatile oils.[5] The taste is bitter and, together with the odor, serves to discourage browsing by many herbivores. It is an evergreen shrub, keeping some of its leaves year-round (although it loses many of them in the late summer).[6] The leaves—attached to the branches at the axillary nodes—are wedge-shaped, NaNcm (-2,147,483,648inches) long and 0.3–1 cm broad, with the wider outer tips divided into three lobes (hence the scientific name tridentata).[7] [8] [9] The leaves are covered with fine silvery hairs.[10]

The plant flowers in the late summer or early fall.[11] The small yellow flowers are in long, loosely arranged tubular clusters.[12] The fruits are seed-like and have a small amount of hairs on the surface.

Big sagebrush can also reproduce through sprouts, which shoot up from the underground rhizome. The sprouts are an extension of the parental plant while seedlings are completely individualistic to any other plant. Among these two strategies, the seedlings need more moisture for germination and early survival. This is due to the sprouts being connected to already healthy and associated plants while the new seedlings will start anew.

Chemistry

Sagebrush essential oil contains approximately 40% l-camphor; 20% pinene; 7% cineole; 5% methacrolein; and 12% a-terpinene, d-camphor, and sesqiterpenoids.

Taxonomy

Much discussion and disagreement revolves around the question of how to divide the species into varieties and subgenera. The following subspecies are accepted by some authors, though others advocate different systems.[13] [14]

Distribution and habitat

Artemisia tridentata grows in arid and semi-arid conditions, throughout the Intermountain West of North America.[16] Sagebrush is not a desert plant, but rather a resident of the steppe, in areas that receive 18– of annual precipitation.[17] Big sagebrush and other Artemisia species are the dominant plants across large portions of the Great Basin, covering some 422000sqmi in 11 western U.S. states and Canadian provinces.[18] The range extends northward through British Columbia's southern interior, south into Baja California, and east into the western Great Plains of New Mexico, Colorado, Nebraska, and the Dakotas.[19] [20]

Ecology

Sagebrush provides food and habitat for a variety of animal species, such as sage grouse, pronghorn, gray vireo, pygmy rabbit, and mule deer.[21] [22] It is especially important to game animals during the winter.[23] Sagebrush also creates habitat for many species of grasses and herbs. Besides providing shade and shelter from the wind, the long taproot of sagebrush draws water up from deep in the soil, some of which becomes available to these surrounding shallow-rooted plants.[24]

The terpenoid compounds in big sagebrush are thought to ward off herbivores. These oils, at high concentrations, are toxic to the symbiotic bacteria in the rumen of some ruminants like deer and cattle.[25] [26] Pronghorn are the only large herbivore to browse sagebrush extensively.[27] Damage to sagebrush plants caused by grazing herbivores results in the release of volatile chemicals, which are used to signal a warning to nearby plants, so that they can increase the production of repellent chemical compounds. This plant-to-plant communication can take place at distances of up to 60cm (20inches).[28] Several major threats exist to sage brush ecosystems, including human settlements, conversion to agricultural land, invasive plant species, wildfires, and climate change.[29] [30] Due to large periods of time where sagebrush was the primary shrub, many species have become adapted to this habitat. The burning of the shrubs leads to habitat loss of many species and can be very detrimental to the ecosystem as a whole.[31] Furthermore, the destruction of native grasses and forbs by grazing and fire creates conditions where invasive plants colonize the area. The invasive species which has destroyed the largest amount of sagebrush habitat is cheatgrass (Bromus tectorum). Since its accidental introduction in the 1890s,[32] cheatgrass has radically altered the native shrub ecosystem by replacing indigenous vegetation,[33] and by creating a fire cycle that is too frequent to allow sagebrush to re-establish itself. Sagebrush lacks fire tolerance and relies on wind-blown seeds from outside the burned area for re-establishment.[34] [35] Some tree species have also encroached on big sagebrush habitat. For example, in the late 20th century, Abies concolor (white fir) was out-competing big sagebrush in Warner Mountains in California.[36]

Galls

This species is host to the following insect induced galls:

external link to gallformersEutreta diana 1.jpg|Eutreta dianaRhopalomyia calvipomum.jpg|Rhopalomyia calvipomumRhopalomyia conica 1.jpg|Rhopalomyia conicaRhopalomyia pomum gall.jpg|Rhopalomyia pomumRhopalomyia_medusa_1.jpg|Rhopalomyia medusa

Uses

The Cahuilla used to gather large quantities of sagebrush seed and grind it to make flour.[37] The main modern use is as firewood, with the wood's oils being particularly flammable.

Medicinal

The plant's active medicinal constituents include camphor, terpenoids, and tannins.

It is used as a herbal medicine by Native Americans throughout the Intermountain West of North America, most notably as a smudging herb. It is also used for preventing infection in wounds, stopping internal bleeding, and treating headaches and colds.

The Navajo use the vapors of sagebrush as a treatment for headache.[38] [39] The Okanagan and Colville people used sagebrush to smoke hides.[40]

Among the Zuni people, an infusion of the leaves is used externally for body aches. The infusion is also taken as a cold medicine. It is also placed in shoes to treat athlete's foot, fissures between toes, and as a foot deodorant.[41]

Culture

Artemisia tridentata is the state flower of Nevada.

See also

External links

Notes and References

  1. MacKay, Pam (2013), Mojave Desert Wildflowers, 2nd ed.,, p. 264.
  2. Book: Brayshaw, T.C.. Artemisia tridenta Nutall. (Big Sagebrush). Trees and Shrubs of British Columbia. University of British Columbia Press. 1996. 9780774805643. 337. https://books.google.com/books?id=2pzdJ8eddAEC&pg=PA337.
  3. Book: Mozingo, Hugh N.. Shrubs Of The Great Basin: A Natural History. University of Nevada Press. 1987. 9780874171129. 271.
  4. Book: Barbour, Michael G. . North American Terrestrial Vegetation . Billings, William D. . Cambridge University Press . 2000 . 9780521559867 . 259.
  5. Book: Shakhnoza, Azimova S.. Lipids, Lipophilic Components and Essential Oils from Plant Sources. Springer. 2012. 9780857293237. 844. etal.
  6. Book: Baldwin, Bruce G.. The Jepson Desert Manual: Vascular Plants of Southeastern California. University of California Press. 2002. 9780520227750. 117.
  7. Book: Ferris, Roxana A. . Abrams, LeRoy. Artemisia tridentata Nutt. Sagebrush. Illustrated Flora of the Pacific States, Vol. IV: Bignonias to Sunflowers. Stanford University Press. 1960. 9780804700061. 412. https://books.google.com/books?id=y9akJhAEJc8C&pg=PA412.
  8. Book: Stuart, John D. . Sawyer, John O. . amp. Big Sagebrush (Artemisia tridentata). Trees and Shrubs of California. University of California Press. 2001. 9780520221093. 169. https://books.google.com/books?id=me9WDy7GXioC&pg=PA169.
  9. Book: Clarke, Charlotte B. . Edible and Useful Plants of California . University of California Press . 1978 . 9780520032675 . 134 . Big Sagebrush . https://books.google.com/books?id=fzckXaQgsDEC&pg=PA134.
  10. Book: Kershaw, Linda . Rare Vascular Plants of Alberta . University of Alberta . 2001 . 9780888643193 . 25 . Big sagebrush . registration.
  11. Book: Raven, Peter H.. Native Shrubs of Southern California. University of California Press. 1996. 9780520010505. 54.
  12. Book: Tilford, Gregory L.. Edible and Medicinal Plants of the West. Mountain Press Publishing. 1997. 9780878423590. 208.
  13. Web site: USDA Plants Database . 16 March 2022 . Plants.usda.gov.
  14. Web site: Artemisia tridentata in Flora of North America @ efloras.org . 16 March 2022 . Efloras.org.
  15. Book: Barbour, Michael G. . Terrestrial Vegetation of California . University of California Press . 2007 . 9780520249554 . 599 . etal.
  16. Book: Smith, Stanley D.. Physiological Ecology of North American Desert Plants. Springer. 1997. 9783540531135. 107. etal.
  17. Book: Mozingo, Hugh N.. Shrubs Of The Great Basin: A Natural History. University of Nevada Press. 1987. 9780874171129. 270.
  18. Book: Müller-Schwarze, Dietland. Chemical Ecology of Vertebrates. Cambridge University Press. 2006. 9780521363778. 310.
  19. Web site: Biota of North America Program 2014 county distribution map . 16 March 2022 . Bonap.net.
  20. Web site: Artemisia tridentata Calflora . 16 March 2022 . Calflora.org.
  21. Book: Smith, Genny. Sierra East: Edge of the Great Basin. University of California Press. 2000. 9780520086890. 168.
  22. Book: Barbour, Michael G.. Terrestrial Vegetation of California. University of California Press. 2007. 9780520249554. 593. etal.
  23. Book: Whitney, Stephen . Western Forests (The Audubon Society Nature Guides) . 1985 . Knopf . 0394731271 . New York . 400.
  24. Book: Cresser, Malcolm S. . Smith, Keith A. . amp. Soil and Environmental Analysis: Modern Instrumental Techniques. CRC Press. 2003. 9780824756949. 364.
  25. Nagy, JG and RP Tengerdy. 1968. Antibacterial action of essential oils of Artemisia as an ecological factor: II. Antibacterial action of the volatile oils of Artemisia tridentata (big sagebrush) on bacteria from the rumen of mule deer" Applied and Environmental Microbiology 16(3) 441–44.
  26. Book: Rogosic, J.. Importance of plants with medicinal properties in herbivore diets. Casasús, I. . Rosati, Andrea. Animal Farming and Environmental Interactions in the Mediterranean Region. Wageningen Academic Pub.. 2011. 9789086861842. 47–48. https://books.google.com/books?id=2wRCo3uNlVgC&pg=PA47. etal.
  27. Book: Lentz, David L.. Imperfect Balance: Landscape Transformations in the Precolumbian Americas. Columbia University Press. 2000. 9780231111560. 49.
  28. Book: Holopainen, Jarmo K. . Blande, James D.. Molecular Plant Volatile Communication. López-Larrea, Carlos. Sensing in Nature. Springer. 2012. 9781461417033. 20. https://books.google.com/books?id=f3TNR_Inv5oC&pg=PA20.
  29. Book: Knick, Steven T. . Connelly, John. Greater Sage-Grouse: Ecology and Conservation of a Landscape Species and Its Habitats. University of California Press. 2011. 9780520267114. 145.
  30. Book: Shepherd, Jay F. . etal . Landscape Fragmentation and Non-Breeding Greater Sage-Grouse. Ecology, Conservation, and Management of Grouse. 4 September 2011 . Sandercock, Brett K.. University of California Press. 9780520270060. 78. https://books.google.com/books?id=vuocreLnCp4C&pg=PA78. etal.
  31. Wambolt. C.L.. Walhof, Frisina. Recovery of big sagebrush communities after burning in south-western Montana. Journal of Environmental Management. March 2001. 61. 3. 243–252. 10.1006/jema.2000.0411. 11381951.
  32. Book: Radosevich, Steven R.. Weed Ecology: Implications for Management. John Wiley & Sons. 1997. 9780471116066. 29–30. etal.
  33. Book: Radosevich, Steven R.. Ecology of Weeds and Invasive Plants: Relationship to Agriculture and Natural Resource Management. John Wiley & Sons. 2007. 9780471767794. 26–29. etal.
  34. This is in contrast to many of the other plants which share its habitat, such as Rabbitbrush, Ephedra and bunchgrasses, which can root-sprout after a fire.
  35. Book: Boersma, P.D. . Van Buren, Amy N.. Invasive Species in the Pacific Northwest. University of Washington Press. 2006. 9780295985961. 36.
  36. Vale. Thomas. Invasion of big sagebrush (Artemisia tridentata) by white fir (Abies concolor) on the southeastern slopes of the Warner Mountains, California. Western North American Naturalist. 1975. 35. 3.
  37. Book: Jaeger, Edmund C. . Desert Wild Flowers . Stanford University Press . 1940 . 9780804703659 . 302 . Edmund Jaeger.
  38. Edible and Medicinal Plants of the West, Gregory L. Tilford,
  39. Book: Kay, Margarita. Healing with Plants. University of Arizona Press. 1996. 9780186516465. 106–107. registration.
  40. Book: Pennacchio, Marcelo. Uses and Abuses of Plant-Derived Smoke: Its Ethnobotany As Hallucinogen, Perfume, Incense, and Medicine. Oxford University Press. 2010. 9780195370010. 48. etal.
  41. Camazine, Scott and Robert A. Bye 1980 A Study Of The Medical Ethnobotany Of The Zuni Indians of New Mexico" Journal of Ethnopharmacology 2:365–88 (p. 374)

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