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

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

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

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

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

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

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

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

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

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

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

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

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

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

15. Flowers in vertical columns Leaves opposite or whorled
Flowers have 5 to 7 petals
Plants can have stems
Leaves opposite or whorled

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

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

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

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

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

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

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

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

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