Utah Noxious Weeds 1 Bermudagrass 2 Canada Thistle

Utah Noxious Weeds 1. Bermudagrass 2. Canada Thistle 3. Diffuse Knapweed 4. Dyer’s Woad 5. Field Bindweed 6. Hoary Cress 7. Johnsongrass 8. Leafy Spurge 9. Medusahead (Cynodon dactylon) (Cirsium arvense) (Centaurea diffusa) (Isatis tinctoria) (Convolvulus arvensis) (Cardaria draba) (Sorghum halepense) (Euphorbia esula) (Taeniatherum caput-medusae)

Utah Noxious Weeds 10. Musk Thistle (Carduus nutan) 11. Perennial Pepperweed (Lepidium latifolium) 12. Purple Loosestrife (Lythrum salicaria) 13. Quackgrass 14. Russian Knapweed 15. Scotch Thistle 16. Spotted Knapweed 17. Squarrose Knapweed 18. Yellow Starthistle (Elytrigia repens) (Acroptilon repens) (Onopordum acanthium) (Centaurea maculosa) (Centaurea virgata) (Centaurea solstitialis)

Additional Invasive Weeds of Utah 19. Cheatgrass (Bromus tectorum) 21. Russian Olive (Elaeagnus angustifolia) 22. Saltcedar (Tamarisk) (Tamarix ramosissima)

Flower head, 3 -7 spikes Decumbent “lay flat” stems Horizontal stem showing many growing points Rhizomes

Emerging shoots Flowers mostly pink, some white Plant in bloom, 2 -3 feet tall Creeping rootstock

Flowers usually white Some rose-colored flowers Branched, numerous flowering heads Spiny bracts

Dangling fruits turn black Clasping arrow-like upper leaves In full bloom Rosette, light midveins

Seedlings Fruit and seeds Plant in full bloom Trumpet-shaped flowers

Clasping leaves, ear-like projections Creeping root system Fruits and white flowers Flowering “flat-top” plant with spreading root system

Light midvein, leaves don’t clasp stem Florets, reddish brown Grows to height of 8 feet, open panicle inflorescence Large rhizomes; stored energy

Flower-like bracts 3 -chambered fruits Typical plant in full bloom - bright yellow-green bracts Stems produce milky latex sap

Seed head may persist over winter Twisted awns, 1 - 4 inches long Problem in rangelands, worse than downy brome Flowers in May & June

Large attractive flower heads Broad flared bracts Naked upper stems below large seed heads Rosette, deeply lobed leaves

White flowers in dense clusters Emerging shoot Lance-shaped leaves, spreading root system Fast-spreading root system

Flowers in vertical columns Flowers have 5 to 7 petals Plants can have 30 -50 stems Leaves opposite or whorled

Early vegetative growth 1 spikelet, produces 4 -6 seeds Cool-season grass, 2 -3 feet tall Aggressive rhizomes

Rose-colored flowers Shield-like bracts, transparent margins Deep-rooted perennial with black roots Emerging shoot, toothed leaves

Needle-like bracts, winged stem Typical rosette Mature plants up to 10 feet tall Silver-gray foliage

Flowers pinkish-purple Dark tipped bracts Two to three feet tall, deep tap root, spreads only by seed Rosette leaves deeply lobed

Small pink flower heads Bract tips are recurved Stems are highly branched Deeply lobed gray-green leaves

Yellow flowers, spine-tipped bracts Winged stems Mature plant, 1 -3 feet tall Seedling leaves deeply lobed

Narrow leaves, hairy stem Drooping seed head Alters ecosystems by increasing fire frequency Barbed seeds

Sharp thorns, sage-green leaves Olive-like fruit Mature plants, 15 -40 feet tall Dried fruit

Leaves are small and scale-like Fragrant pink flowers Very invasive along waterways Smooth woody stem