BugwoodWiki Article

Dyer's woad
Isatis tinctoria L.

Overview

Appearance
Isatis tinctoria is a biennial member of the mustard family that can grow from 1-4 ft. (0.3-1.2 m) tall.
Foliage
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.
Flowers
Flat-topped yellow flowers with four spoon shaped petals appear in small clusters at the top of the stems. Flowering occurs in spring to late summer.
Fruit
Seed pods are black or purplish, flattened, 0.4 in. (0.9 cm) long, 0.25 in. (0.6 cm) wide and hang from short stalks at the ends of the stems.
Ecological Threat
Isatis tinctoria occurs in areas with poor, dry soils such as roadsides, rangelands and open forests. Isatis tinctoria 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.

Resources

Selected Images


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Dyer's woad
Isatis tinctoria
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Dyer's woad
Isatis tinctoria
Infestation
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Infestation
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Isatis tinctoria
Root(s)
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Isatis tinctoria
Fruit(s)
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Isatis tinctoria
Infestation
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Isatis tinctoria
Plant(s)
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Isatis tinctoria
Infestation
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Infestation
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Isatis tinctoria
Plant(s)
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Plant(s)
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Plant(s)
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Plant(s)
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Flower(s)
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Infestation
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Control
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Plant(s)
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Seed(s)
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Dyer's woad
Isatis tinctoria
Life Cycle
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Dyer's woad
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Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Dilleniidae
Order: Capparales
Family: Brassicaceae
Genus: Isatis

Other System Links

Plants: ISTI
Bayer: ISATI
GRIN: 20462
ITIS: 23151
NPDN Pest: PBKAVBA

Synonyms and Other Names

Other Common Names:
Dyers woad

Categories

Category: Forbs/Herbs