Artemisia ludoviciana is North American species in the daisy family, known by several common names, including silver wormwood, western mugwort, Louisiana wormwood, white sagebrush, and gray sagewort.
Artemisia ludoviciana is native to North America where it is widespread across most of the United States, Canada, Mexico, and Central America, although indications suggest that the populations in the eastern United States have been introduced from the western and central part of the country. This is a rhizomatous perennial plant growing to heights between 30 centimeters and one meter. The stems bear linear leaves up to 11 centimeters long. The stems and foliage are covered in woolly gray or white hairs. The top of the stem is occupied by a narrow inflorescence of many nodding (hanging)flower heads. Each small head is a cup of hairy phyllaries surrounding a center of yellowish disc florets and is about half a centimeter wide. The fruit is a minute achene. This plant was used by many Native American groups for a variety of medicinal, veterinary, and ceremonial purposes.
- Artemisia ludoviciana subsp. albula (Wooton) D.D.Keck - deserts from California + Colorado to Chihuahua, Sonora, Baja California
- Artemisia ludoviciana subsp. candicans (Rydb.) D.D.Keck - Rockies + Cascades from Alberta + British Columbia to California + Colorado
- Artemisia ludoviciana subsp. incompta (Nutt.) D.D.Keck - mountains from Alberta + British Columbia to Mexico
- Artemisia ludoviciana subsp. ludoviciana - western + central United States + western Canada
- Artemisia ludoviciana subsp. mexicana (Willd. ex Spreng.) D.D.Keck - Mexico as far south as Puebla; United States as far north as Colorado + Missouri
- Artemisia ludoviciana subsp. redolens (A.Gray) D.D.Keck - Durango, Chihuahua, Arizona, New Mexico, Texas
- Artemisia ludoviciana subsp. sulcata (Rydb.) D.D.Keck - Chihuahua, Sonora, Arizona
Ludoviciana is the Latinized version of the word Louisiana.
Artemisia ludoviciana has become a popular garden plant, although it has a tendency to be aggressive in some gardens. The most commonly grown forms are the selections A. ludoviciana 'Valerie Finnis' and 'Silver Queen', which are both hardy to USDA zone 4. 'Valerie Finnis' gained the Royal Horticultural Society's Award of Garden Merit in 1993.
- The Plant List Artemisia ludoviciana Nutt.
- Flora of North America Vol. 19, 20 and 21 Page 527 Silver wormwood, white or silver sage Artemisia ludoviciana Nuttall, Gen. N. Amer. Pl. 2: 143. 1818.
- Berendsohn, W.G. & A.E. Araniva de González. 1989. Listado básico de la Flora Salvadorensis: Dicotyledonae, Sympetalae (pro parte): Labiatae, Bignoniaceae, Acanthaceae, Pedaliaceae, Martyniaceae, Gesneriaceae, Compositae. Cuscatlania 1(3): 290–1–290–13
- Turner, B. L. 1996. The Comps of Mexico: A systematic account of the family Asteraceae, vol. 6. Tageteae and Athemideae. Phytologia Memoirs 10: i–ii, 1–22, 43–93
- Biota of North America Program 21014 county distribution map
- RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964.
- Keck, David Daniels 1946. A revision of the Artemisia vulgaris complex in North America. Proceedings of the California Academy of Sciences, Series 4, 25(17): 421-468 descriptions, line drawings, range maps of several species
- "RHS Plant Selector - Artemisia ludoviciana 'Valerie Finnis'". Retrieved 2 June 2013.
- Jepson Manual Treatment
- United States Department of Agriculture Plants Profile
- University of Michigan @ Dearborn, Native American Ethnobotany
- Estes' Artemisia A Rare Mugwort from the Pacific Northwest by Howie Brounstein, Kalmiopsis, the Journal of the Native Plant Society of Oregon. 2008, revised from 1996 article
- Calphotos Photo gallery, University of California
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