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.Rating: Moderate
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- USDA PLANTS database -
Federal database with information on identification and distribution, and links to websites in individual states.
- Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from the UC Berkeley Jepson Herbarium.
- CalFlora - Distribution information by county based on submitted observations and herbarium specimens.
- The Nature Conservancy Management Summary - Information compiled by TNC land managers. Photos included for some species.
- CalPhotos - Images of plants taken mostly in California.
- Clines, J. (2005). Preventing weed spread via contaminated hay and straw. California Invasive Plant Council Symposium 2005. Chico, CA.
Cal-IPC News Articles
- Brusati, E., D. Morawitz, et al. (2011). Prioritizing Regional Response to Invasive Plants in the Sierra Nevada. Cal-IPC News. 19: 4, 5, 10.
- Richardson, B. (2004). The A-rated north. Cal-IPC News. 12: 4-5,14.