Flower Color

• Yellow

Inflorescence Type (How the flowers are arranged on the plant)

• Head

Number of Petals

• 5 petals
• more than 10 petals

Petal Separation

• Completely free to base
• United > 75% of length

Petal Tip

• Pointed
• Rounded
• Square
• Toothed

Flower Symmetry

• Flowers regular

Flower Length (Head length in the Asteraceae)

• 5 mm (.20 inch)
• 6 mm (.24 inch)
• 7 mm (.28 inch)
• 8 mm (.32 inch)
• 9 mm (.36 inch)
• 1.0 cm (.40 inch)

Flower Width (Head width in the Asteraceae)

• 1.5 cm (.60 inch)
• 2.0 cm (.80 inch)
• 2.5 cm (1.0 inch)

Number of Sepals

• sepals lacking
• more than 10 sepals

Sepal Separation

• Completely free to base

Sepal Tip

• Pointed
• Spine-like

Flower Sex

• Bisexual (perfect)

Number of Styles

• 1 style

Number of Stamens

• 5 stamens

Stamens Attached to the Petals

• Stamens attached to the petals

Stamens Connate (united)

• Anthers united, syngynoecious

Carpel Separation

• Carpels united (or one)

Number of Carpels

• 1 carpel

Ovary Position

• Inferior (epigynous)

Fruit Type

• Achene

Fruit Length at Maturity

• 2 mm (.08 inch)
• 3 mm (.12 inch)

Fruit Width at Maturity

• 1 mm (.04 inch) or less

Burs

• Fruit or seed NOT bur-like

Leaf Arrangement

• Alternate

Leaf Type

• Simple (including lobed leaves)

Stipules

• Lacking

Tendrils

• Tendrils absent

Venation

• Pinnate

Petiole (leaf stem) Blade Ratio

• Petiole absent (leaf sessile)

Leaf Length (blade PLUS petiole)

• 1 - 2 cm (.40 - .80 inch)
• 2 - 4 cm (.80 - 1.60 inches)
• 4 - 10 cm (1.60 - 4.0 inches)

Leaf Width

• 1 - 5 mm (.04 - .20 inch)
• 5 - 10 mm (.20 - .40 inch)

Leaf Shape (simple leaves only)

• Pinnately lobed

Leaf or Leaflet Margin

• Lobed
• Parted

Leaf or Leaflet Blade Base

• Acuminate (attenuate)

Leaf or Leaflet Tip

• Acuminate (attenuate)
• Aristate
• Mucronate

Leaf or Leaflet Blade Surface

• Glabrous (NO hairs)
• Glandular
• Sparsely hairy
• Spiny or prickly
• Tomentose

Succulence

• Not succulent

Milky Juice

• Juice NOT milky (watery)

Woodiness

• Herbaceous
• Semi-woody

Spines or Thorns

• Spines or Thorns ABSENT

Aromatic (vegetative structures)

• Not aromatic
• Aromatic

Life Cycle

• Perennial

Growth Habit (while flowering)

• Erect, spherical (bushy)

Plant Height at Maturity

• 2 - 4 dm (8.0 - 16.0 inches)
• 4 - 6 dm (1.3 - 2.0 feet)
• 6 - 8 dm (2.0 - 2.6 feet)

Wind Dissemination

• Not wind disseminated

Moisture Regime

• Mesic
• Arid

Chlorophyll

• Present

Stem Cross Section

• Round

Flowering Stem Leaves

• Stem uniformly leafy

Main Stem Branches

• Main stem branched

Root or Vegetative Propagule

• Tap Root

US State

• Arkansas
• Kansas
• Texas
• Arizona
• California
• Colorado
• Iowa
• Idaho
• Minnesota
• Montana
• North Dakota
• New Mexico
• Nevada
• Oklahoma
• South Dakota
• Utah
• Wyoming
• Nebraska

Canadian Province or Territory

• Alberta
• Manitoba
• Saskatchewan

• Common Weeds of the Canadian Prairies, 1963 (Cat# A53-1136-1) See page: 41
• Nebraska Weeds, 1979 Nebraska Dept. of Ag., Lincoln NE, See page: 251
• Weeds of Nebraska and the Great Plains, 1994 (ISBN 0939870-00-4) See page: 140
• Listed as a `Weed` by the Biota of North America Program, 2008 x