Flower Color

• Blue-purple
• Purple
• White
• Brown/Black

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

• Head
• Solitary, axillary
• Solitary, terminal

Number of Petals

• 4 petals

Petal Separation

• United > 75% of length

Petal Tip

• Rounded

Flower Symmetry

• Flowers regular
• Flowers slightly irregular

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)
• 5.0 cm (2.0 inches) or more

Flower Width (Head width in the Asteraceae)

• 2 mm (.08 inch)
• 3 mm (.12 inch)
• 4 mm (.16 inch)
• 3.5 cm (1.4 inches)
• 4.0 cm (1.6 inches)
• 4.5 cm (1.8 inches)
• 5.0 cm (2.0 inches)
• > 5.0 cm (> 2.0 inches)

Number of Sepals

• 4 sepals

Sepal Separation

• United > 75% of length

Sepal Tip

• Pointed
• Rounded

Flower Sex

• Bisexual (perfect)

Number of Styles

• 1 style

Number of Stamens

• 4 stamens

Stamens Attached to the Petals

• Stamens attached to the petals

Stamens Connate (united)

• Filaments or anthers NOT united

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)
• 6 mm (.24 inch)
• 7 mm (.28 inch)

Fruit Width at Maturity

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

Burs

• Fruit or seed NOT bur-like
• Fruit or seed bur-like

Leaf Arrangement

• Opposite

Leaf Type

• Simple (including lobed leaves)

Stipules

• Lacking

Tendrils

• Tendrils absent

Venation

• Pinnate

Petiole (leaf stem) Blade Ratio

• Petiole absent (leaf sessile)
• Petiole < 25% total length

Leaf Length (blade PLUS petiole)

• 1 - 2 dm (4.0 - 8.0 inches)
• 2 - 4 dm (8.0 - 16.0 inches)
• 4 - 6 dm (1.3 - 2.0 feet)

Leaf Width

• 2 - 4 cm (.80 - 1.6 inches)
• 4 - 10 cm (1.6 - 4.0 inches)
• 1 - 2 dm (4.0 - 8.0 inches)

Leaf Shape (simple leaves only)

• Lanceolate
• Oblanceolate

Leaf or Leaflet Margin

• Crenate
• Dentate
• Entire
• Serrate

Leaf or Leaflet Blade Base

• Acuminate (attenuate)
• Clasping
• Rounded

Leaf or Leaflet Tip

• Acuminate (attenuate)
• Acute

Leaf or Leaflet Blade Surface

• Glabrous (NO hairs)
• Lower leaf surface more hairy
• Spiny or prickly

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

• Biennial

Growth Habit (while flowering)

• Erect, columnar (narrow)

Plant Height at Maturity

• 6 - 8 dm (2.0 - 2.6 feet)
• 8 - 10 dm (2.6 - 3.3 feet)
• 1 - 1.5 meters (3.3 - 5.0 feet)
• 1.5 - 2.0 meters (5.0 - 6.6 feet)
• 2 - 2.5 meters (6.6 - 8.3 feet)
• 2.5 - 5 meters (8.3 - 16.6 feet)

Wind Dissemination

• Not wind disseminated

Moisture Regime

• Semi-aquatic
• 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 unbranched
• Main stem branched

Root or Vegetative Propagule

• Tap Root

US State

• Alabama
• Arkansas
• Connecticut
• Delaware
• Illinois
• Kansas
• Kentucky
• Massachusetts
• Maine
• Michigan
• Missouri
• Mississippi
• North Carolina
• New Hampshire
• New Jersey
• New York
• Ohio
• Pennsylvania
• Tennessee
• Texas
• Virginia
• Wisconsin
• West Virginia
• Indiana
• Maryland
• Rhode Island
• Vermont
• Arizona
• California
• Colorado
• Iowa
• Idaho
• Montana
• New Mexico
• Nevada
• Oklahoma
• Oregon
• South Dakota
• Utah
• Washington
• Wyoming
• Nebraska

Canadian Province or Territory

• British Columbia
• Ontario
• Quebec

Other

• District of Columbia

• The Biology of Canadian Weeds: Canadian Journal of Plant Science Vol:55Pg.783
• California Growers Weed Identification Handbook, 1968 - 1998 University of California Publication # 4030-1, See page: 227
• Common Weeds of the United States, 1971 (ISBN 0-486-20504-5) See page: 360
• Field Guide To The Common Weeds Of Kansas, 1983 (ISBN 0-7006-0233-X) See page: 192
• Gilkey`s Weeds of the Pacific Northwest, 1980 (ISBN 0-88246-039-0) See page: 283
• How to Know the Weeds, 1972, (ISBN# 0-697-04880-2) See page: 149
• Manual of Ohio Weeds, 1931 Ohio Ag. Exp. Station Bull. # 475, See page: 89
• More Turfgrass and Related Weeds: Beyond the Color Atlas, 2011 Clemson University Publishing ISBN# 978-0-9798777-5-9 See Page: 220
• Northwest Weeds, 1990 (ISBN 0-87842-249-8) See page: 113
• Ontario Weeds, 1992 Agdex 640, Publication #505 See page: 203
• Selected Weeds of Oregon, 1985 and 1989 Supplement (s) Oregon State Dept. of Agriculture, See page: 68
• S.W.S.S. Weed ID Guide, 1993 Section Number and Five letter code: 11 DIWSI
• Weed Seeds of the Great Plains, 1993 University of Kansas# 92-125-B ISBN# 0-7006-0651-3 See index #: 187
• Weeds, 1955 (1980) Walter Conrad Muenscher, ISBN# 0-8014-1266-8 See page: 416, 417
• Weeds and Poisonous Plants of Wyoming and Utah 1987 (ISBN 0-941570-06-1) See page: 134
• Weeds of California, 1970, State of California Publications and Documents. See page: 414, 415
• Weeds of California and other Western States, 2007 (ISBN 13: 978-1-879906-69-3) See Page: 685
• Weeds of Eastern Washington and Adjacent Areas, 1972 (LOC 72-83635) See page: 258
• Weeds of Kentucky and Adjacent States, 1991 (ISBN 0-8131-1743-7) See page: 204
• Weeds of the Midwestern United States & Central Canada, University of Georgia 2010, ISBN#0-8203-3506-1 See page: 201
• Weeds of the North Central States, 1981 Univ. of Illinois, Urbana - Champaign Bulletin # 772, See page: 175
• Weeds of the Northeast, 1956, Univ. of Delaware Field Manual #1 See species #: 126
• Weeds of the Northeast, 1997 Cornell University ISBN# 0-8014-8334-4 See page: 220
• Weeds of the Northern United States and Canada, 1964 Montgomery See page: 159
• Weeds of the South, University of Georgia 2009, ISBN#0-8203-3046-9 See page: 182
• Weeds of the United States and Their Control, Lorenzi 1987, ISBN# 0-442-25884-4 See page: 286
• Weeds of the West, 1992 (ISBN 0941570-13-4) See page: 302
• Weeds of the West, 2000 (ISBN 0941570-13-4) See page: 300
• Weeds of Utah, 1971 UAES Special Report 21, See page: 86
• Listed as a `Weed` by the Biota of North America Program, 2008 X
• Listed in the WSSA Composite List of Weeds X