Camel Thorn Alhagi psudalhagi

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Camel ThornAlhagi psudalhagi

• Spiny, creeping perennial. 1.5- 4 ft.
• Deep penetrating horizontally spreading roots.
• Stems covered with greenish spines.

2
Dyers WoadIsatis tinctoria

• 4 ft tall, annual, biennial or short lived
  perennial.
• Spreads only by seed.
• Thick tap root, up to 5 ft. deep.

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Dyers WoadIsatis tinctoria

• Small yellow flowers in flat topped clusters.
• Fruits, teardrop shape, hang down off the stem.
  Purple brown.

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Diffuse KnapweedCentaurea diffusa

• Growth 3 feet
• Stem single, much branched, bushy.

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DiffuseKnapweedCentaurea diffusa

• Flowers white to pinkish.
• Bracts yellowish-green, comblike margin, ending
  with a short-stiff spine.

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Russian KnapweedCentaurea repens

• GROWTH Creeping perennial, dense colonies
  produced from buds on roots.

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Russian KnapweedCentaurea repens

• ROOTS Deep (25)
• FLOWERS Pink to purple on tips of stems.
• BRACTS papery with pointed margin.
• Causes Chewing Disease.

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Spotted KnapweedCentaurea maculosa

• GROWTH Biennial, 3 ft tall.
• STEM Covered with fine hair.

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Spotted KnapweedCentaurea maculosa

• FLOWER Pink to purple, rarely white. Seed head
  bracts are black tipped, appear spotted.
• Rosette forms the first year, flower stalks the
  second year.
• Very aggressive.

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Squarrose KnapweedCentaurea vigata

• Perennial, erect to 18 inches.
• STEMS Many branched, covered with dense fine
  hair.

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Squarrose KnapweedCentaurea vigata

• LEAVES covered with dense fine hair.
• ROOTS Taproot.
• Sprouts back after fire.

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Squarrose KnapweedCentaurea vigata

• FLOWER at the end of the stems.
• Rose to pink.
• Bract tips spines are sharp, spreading, and
  recurved.

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Yellow Star ThistleCentaurea solstitialis

• FLOWER Develop at tips of stems. Bracts bear
  3/4 thorns.
• SEEDS
• A single plant can produce 150,000 seeds.
• Plumed unplumed

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Yellow Star ThistleCentaurea solstitialis

• LEAF Leaf clasps stem and appears winged.

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Yellow Star ThistleCentaurea solstitialis

• GROWTH 2-3 ft. annual. Invades Cheatgrass sites.
  Spreads rapidly. Changes completely the
  habitats that it invades.

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Yellow Star ThistleCentaurea solstitialis

• Dandelion looking rosette forms after
  germination.

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CanadaThistleCirsium arvense

• Growth Perennial up to 5 ft. tall
• Leaves wavey margins, yellowish spines

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Canada ThistleCirsium arvense

• Flowers Purple, occasionally white
• Stems single, branched near top, hollow

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Musk Thistle Carduus nutans

• GROWTH Erect, up to 7 ft. tall. Biennial,
  rosette formed first year, stem elongates the
  second year.

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Musk Thistle Carduus nutans

• LEAVES Dark green with light midrib, hairless on
  both sides.
• STEMS Hairless
• SEEDS Can be in excess of 20,000 per plant.

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Musk Thistle Carduus nutans

• FLOWERS Solitary. Heads nodding by mid summer.
  1.5-3 diameter. Bright purple, sometimes white.
  Spiny bracts.

22
Scotch Thistle Onopordum acantium

• GROWTH Erect, up to 8 ft. tall. Biennial,
  rosette formed first year, stem elongates the
  second year.
• LEAVES Velvet gray, hairy on both sides.
• STEMS Spiny leaf wings extend down onto stem.

23
Scotch ThistleOnopordum acantium

• FLOWERS Numerous, spiny rounded on the bottom
  but flat on top. Pale purple to violet. Flowers
  stand alone on branch tips.

24
Dalmatian ToadflaxLinaria genstifolia ssp.
dalmatica

• Creeping perennial. Up to 3 ft tall.
• LEAVES alternate and waxy.
• Heart shaped.
• Clasp the stem.

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Dalmatian ToadflaxLinaria genstifolia ssp.
dalmatica

• Flowers yellow snapdragon-like, with an orange
  bearded throat.
• 1 long
• Serious problem in Colorado and Arizona.

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Yellow ToadflaxLinaria vulgaris

• Creeping perennial, 1-2 ft tall.
• Narrow, strap like 2 leaves.
• May be harmful to livestock.

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Yellow ToadflaxLinaria vulgaris

• Yellow snapdragon-like flower with an orange
  throat.
• Referred to as butter and eggs

28
Salt CedarTamarix ramosissima

• Growth 5-20 ft shrub or small tree.

• Stems reddish-brown bark, highly branched.

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Salt CedarTamariz ramosissima

• Leaves small, scale-like,
• Flowers pink to white, finger-like clusters.

30
Leafy SpurgeEuphorbia esula

• Aggressive, up to 3 ft.
• Milky latex.
• ROOTS
• Creeping
• 25 ft deep
• Sprouts from root buds.

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Leafy SpurgeEuphorbia esula

• Yellowish green bracts enclose flowers.
• Seed capsules rupture, throwing seeds up to 15
  feet.

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Hoary CressWhite Top, PepperweedCardaria draba

• Perennial, 3 ft tall.
• Flowers white, densely clustered.
• Gray/green leaves, clasping.

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Perennial Pepperweed Tall White TopLepidium
latifolium

• Creeping perennial up to 6 ft. tall.
• Leaves have prominent midvein
• White flowers in a rounded cluster.

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Rush SkeletonweedChondrilla juncea

• Growth Perennial- up to 4 feet.
• Stems Appear leafless. Lower stem covered with
  coarse brown hairs
• Stems and leaves produce milky latex.

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Rush SkeletonweedChondrilla juncea

• Flower Yellow scattered among branches.

• Basal leaves form a dandelionlike rosette

36
Medusahead RyeTaeniatherum caput-medusae

• Growth aggressive winter annual 6-24 inches.
• Leaves rolled
• Flower Long-awned spiked, mature awns twisted
  and barbed.