Major Rangeland Plants of Idaho: Noxious Weeds

1. Major Rangeland Plants of Idaho: Noxious Weeds

2. Dyer’s Woad • Perennial • Introduced • Poor for Grazers • Poor for Browsers Flat topped seedhead Hanging clusters of green pods (dark brown to purple on maturity) Lanceolate leaves; clasp at stem “Idaho Weed Resources.” http//www.uidaho.edu/weeds

3. Hoary Cress/Whitetop • Perennial • Introduced • Poor for Grazers • Poor for Browsers Terminal flowers Herbaceous (forb) “Idaho Weed Resources.” http//www.uidaho.edu/weeds

4. Leafy Spurge • Perennial • Introduced • Fair for Grazers • Poor for Browsers No flower petals; yellow bracts below flower Rhizomatous roots

5. Poison Hemlock • Perennial • Introduced • Poor for Grazers • Poor for Browsers Flowers arranged in umbel Leaves highly divided; carrot-like ** Poisonous – This plant can contains a toxic alkaloid

6. Rush Skeletonweed • Perennial • Introduced • Fair for Grazers • Fair for Browsers Yellow flowers linear leaves on stem or dandelion-like leaves in rosette “Idaho Weed Resources.” http//www.uidaho.edu/weeds

7. Spotted Knapweed • Perennial • Introduced • Fair for Grazers • Poor for Browsers Flower head characterized by dark-tipped bracts Pinkish-purple flowers

8. Yellow Starthistle • Annual • Introduced • Poor for Grazers • Poor for Browsers Star-like spines at base of flower Taproot