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Ageratina herbacea is recognized by the distinctive color of its usually yellow-green, sometimes grayish, leaves, granular-puberulent involucres (with minute, thickened, eglandular hairs), and woody rhizomes.
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Description
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Perennials or subshrubs, (20–)30–60(–80) cm (woody crowns and woody rhizomes). Stems erect (brittle), minutely puberulent. Leaves opposite; petioles 10–25 mm; blades triangular to lanceolate-ovate or ovate, 2–5(–7) × 1.5–3.5(–4.5) cm, bases truncate to shallowly cordate, margins dentate to serrate-dentate, abaxial faces sparsely hispidulous to glabrate, eglandular. Heads clustered. Peduncles 4–15 mm, puberulent. Involucres 4–5 mm. Phyllaries: apices acute, abaxial faces granular-puberulent. Corollas white, glabrous. Cypselae finely strigose-hispidulous. 2n = 34.
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Synonym
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Eupatorium ageratifolium de Candolle var. herbaceum A. Gray, Smithsonian Contr. Knowl. 5(6): 74. 1853; E. herbaceum (A. Gray) Greene
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Ageratina herbacea
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Ageratina herbacea is a North American species of flowering plants in the family Asteraceae known by the common names fragrant snakeroot and Apache snakeroot.[3] It is native to desert regions (Sonoran, Mojave, and Chihuahuan Deserts) of the southwestern United States (southeastern California, southern Nevada, southern Utah, Colorado, Arizona, New Mexico, western Texas) and northern Mexico (Baja California, Chihuahua, Coahuila, Sonora). It grows in rocky slopes in conifer forests and woodlands.[4][5][6][7]
Ageratina herbacea is a perennial herb growing a green, fuzzy stem from a woody caudex to heights between about 50 and 70 centimeters. The leaves are yellow to green or grayish and are triangular to heart-shaped. The inflorescence is a cluster of fuzzy flower heads under a centimeter long containing long, protruding white disc florets and no ray florets. The fruit is an achene a few millimeters long with a rough bristly pappus.[8]
Etymology
Ageratina is derived from Greek meaning 'un-aging', in reference to the flowers keeping their color for a long time. This name was used by Dioscorides for a number of different plants.[9]
References
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^ "NatureServe Explorer - Ageratina herbacea". NatureServe Explorer Ageratina herbacea. NatureServe. 2022-06-22. Retrieved 22 Jun 2022.
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^ "Ageratina herbacea (A.Gray) R.M.King & H.Rob.". The Global Compositae Checklist (GCC) – via The Plant List. Note that this website has been superseded by World Flora Online
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^ USDA, NRCS (n.d.). "Ageratina herbacea". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team.
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^ Nesom, Guy L. (2006). "Ageratina herbacea". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
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^ "Ageratina herbacea". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
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^ "Ageratina herbacea". Calflora. Berkeley, California: The Calflora Database.
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^ Turner, B. L. 1997. The Comps of Mexico: A systematic account of the family Asteraceae, vol. 1 – Eupatorieae. Phytologia Memoirs 11: i–iv, 1–272
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^ Hickman, James C., ed. (1993). "Ageratina herbacea". The Jepson Manual: Higher Plants of California. University and Jepson Herbaria.
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^ Gledhill, David (2008). "The Names of Plants". Cambridge University Press. ISBN 9780521866453 (hardback), ISBN 9780521685535 (paperback). pp 39
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Ageratina herbacea: Brief Summary
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Flower detail
Ageratina herbacea is a North American species of flowering plants in the family Asteraceae known by the common names fragrant snakeroot and Apache snakeroot. It is native to desert regions (Sonoran, Mojave, and Chihuahuan Deserts) of the southwestern United States (southeastern California, southern Nevada, southern Utah, Colorado, Arizona, New Mexico, western Texas) and northern Mexico (Baja California, Chihuahua, Coahuila, Sonora). It grows in rocky slopes in conifer forests and woodlands.
Ageratina herbacea is a perennial herb growing a green, fuzzy stem from a woody caudex to heights between about 50 and 70 centimeters. The leaves are yellow to green or grayish and are triangular to heart-shaped. The inflorescence is a cluster of fuzzy flower heads under a centimeter long containing long, protruding white disc florets and no ray florets. The fruit is an achene a few millimeters long with a rough bristly pappus.
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Ageratina herbacea
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wikipedia VI tarafından sağlandı
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Ageratina herbacea: Brief Summary
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wikipedia VI tarafından sağlandı
Ageratina herbacea là một loài thực vật có hoa trong họ Cúc. Loài này được (A.Gray) R.M.King & H.Rob. mô tả khoa học đầu tiên năm 1970.
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Flower detail 
Bài viết tông cúc Eupatorieae này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn. 
