Common names: dyer's woad
Isatis tinctoria (dyer’s woad) is a winter biennial or short-lived annual herb/forb (family Brassicaceae). Plants are highly competitive and often grow in dense colonies. It can be found distributed among the Klamath, Cascade, and North Coast Ranges, northern & central Sierra Nevada, Modoc Plateau, and northern San Francisco Bay region. Dyer’s woad is a noxious weed of rangeland, agronomic crops, and undisturbed natural areas.Cal-IPC Rating: Moderate
Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.
Cal-IPC Newsletter Articles
- Prioritizing Regional Response to Invasive Plants in the Sierra Nevada. Brusati, Elizabeth; Morawitz, Dana; Powell, Cynthia. Vol 19, Issue 2
Cal-IPC Symposium Presentations
- Clines, J. (2005). Preventing weed spread via contaminated hay and straw. California Invasive Plant Council Symposium 2005. Chico, CA.
Other Isatis tinctoria Information
- CalPhotos - Images of plants taken mostly in California.
- CalFlora - Distribution information based on submitted observations and herbarium specimens.
- CalWeedMapper - Distribution information with ability to determine regional priorities.
- Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
- USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.