Flower Color

• Red (or pink)
• Purple
• Red-purple
• White

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

• Head
• Solitary, terminal

Number of Petals

• 0 (no petals)
• 5 petals
• more than 10 petals

Petal Separation

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

Petal Tip

• Pointed

Flower Symmetry

• Flowers regular

Flower Length (Head length in the Asteraceae)

• 2.0 cm (.8 inch)
• 2.5 cm (1.0 inch)
• 3.0 cm (1.2 inches)
• 3.5 cm (1.4 inches)
• 4.0 cm (1.6 inches)

Flower Width (Head width in the Asteraceae)

• 1.5 cm (.60 inch)
• 2.0 cm (.80 inch)
• 2.5 cm (1.0 inch)
• 3.0 cm (1.2 inches)
• 3.5 cm (1.4 inches)

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

• 3 mm (.12 inch)
• 4 mm (.16 inch)
• 5 mm (.20 inch)

Fruit Width at Maturity

• 1 mm (.04 inch) or less
• 2 mm (.08 inch)

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)

• 4 - 10 cm (1.60 - 4.0 inches)
• 1 - 2 dm (4.0 - 8.0 inches)
• 2 - 4 dm (8.0 - 16.0 inches)

Leaf Width

• 2 - 4 cm (.80 - 1.6 inches)
• 4 - 10 cm (1.6 - 4.0 inches)

Leaf Shape (simple leaves only)

• Elliptic
• Oblanceolate
• Pinnately lobed

Leaf or Leaflet Margin

• Lobed
• Serrate

Leaf or Leaflet Blade Base

• Acute (cuneate)
• Clasping

Leaf or Leaflet Tip

• Acuminate (attenuate)
• Acute
• Aristate

Leaf or Leaflet Blade Surface

• Floccose
• Lower leaf surface more hairy
• Spiny or prickly
• Tomentose

Succulence

• Not succulent

Milky Juice

• Juice NOT milky (watery)

Woodiness

• Herbaceous

Spines or Thorns

• Spines on leaves or stems
• Spines on flowers\fruits AND leaves\stems

Aromatic (vegetative structures)

• Not aromatic

Life Cycle

• Perennial

Growth Habit (while flowering)

• Erect, columnar (narrow)

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)
• 8 - 10 dm (2.6 - 3.3 feet)

Wind Dissemination

• Fruit, seed, or spore wind borne

Moisture Regime

• Seasonally saturated
• Mesic

Chlorophyll

• Present

Stem Cross Section

• Hollow (flowering stem at maturity)
• Ridged
• Round

Flowering Stem Leaves

• Stem leaves greatly reduced
• Stem uniformly leafy

Main Stem Branches

• Main stem branched

Root or Vegetative Propagule

• Rhizomatous
• Tap Root

US State

• Michigan
• Wisconsin
• Vermont
• Colorado
• Iowa
• Idaho
• Minnesota
• Montana
• North Dakota
• South Dakota
• Utah
• Wyoming
• Nebraska

Canadian Province or Territory

• British Columbia
• Ontario
• Quebec
• Alberta
• Manitoba
• Saskatchewan

• Common Weeds of the Canadian Prairies, 1963 (Cat# A53-1136-1) See page: 32
• Nebraska Weeds, 1979 Nebraska Dept. of Ag., Lincoln NE, See page: 191
• South Dakota Weeds, 1967 South Dakota State University, See page: 203
• South Dakota Weeds 2002 South Dakota Dept. of Ag. 523 E. Capitol, Foss Bldg. Pierre, South Dakota 57501 See page: 214
• Weed Seeds of the Great Plains, 1993 University of Kansas# 92-125-B ISBN# 0-7006-0651-3 See index #: 209
• Weeds of Colorado, 1990 Cooperative Extension, Colorado State Univ. Bulletin 521A, See page: 173
• Weeds of Nebraska and the Great Plains, 1994 (ISBN 0939870-00-4) See page: 114
• Weeds of the North Central States, 1981 Univ. of Illinois, Urbana - Champaign Bulletin # 772, See page: 201
• Listed as a `Weed` by the Biota of North America Program, 2008 X
• Listed in the WSSA Composite List of Weeds X