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Dyer's woad	USDA PLANTS Symbol: ISTI USDA ARS GRIN: 20462 ITIS: 23151 NAPIS: PBKAVBA Bayer code: ISATI
Isatis tinctoria L.
Taxonomic Rank: Magnoliopsida: Capparales: Brassicaceae
Synonym(s): Dyers woad
Dyer’s woad is a biennial plant that can grow from 1-4 ft. (0.3-1.2 m) tall. First years growth is represented by a rosette of hairy, bluish-green leaves 1.5-7 in. (3.7-18 cm) long. Stem leaves are lance-shaped and alternate with a cream-colored mid-rib. Yellow flowers with four petals appear in small clusters at the top of the stems in spring to late summer. Seed pods are flattened, 3/8 in. (0.9 cm) long, ¼ in. (0.6 cm) wide and hang from short stalks at the ends of the stems. Dyer’s woad is native to central Asia and northern Russia and was introduced to North America in the early 1900’s as a contaminant in alfalfa seed. Plants occur in areas with poor, dry soils such as roadsides, rangelands and open forests.

Identification, Biology, Control and Management Resources

Weed of the Week - USDA Forest Service

Selected Images from Invasive.org

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Plant(s); rosette Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Feature(s); Roots Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Plant(s); in flower Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage
Plant(s); Up-rooted plant Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Flower(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Fruit(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Life Cycle ; Samples of reproduction, from flowers to mature fruits Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage
Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Seed(s); seeds and fruit Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Seed(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Plant(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage
Plant(s); in flower Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage
Infestation; 9 months after wildfire Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Plant(s); Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage	Infestation; Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage
Control; Hand-pulling by cub scouts Steve Dewey, Utah State University, Bugwood.org Additional Resolutions & Image Usage

Taxonomic References:

USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

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