Flower Color

• Yellow

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

• Head
• Panicle

Number of Petals

• 5 petals
• 8 petals
• 9 petals
• 10 petals
• more than 10 petals

Petal Separation

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

Petal Tip

• Square
• Toothed

Flower Symmetry

• Flowers regular

Flower Length (Head length in the Asteraceae)

• 9 mm (.36 inch)
• 1.0 cm (.40 inch)
• 1.5 cm (.6 inch)
• 2.0 cm (.8 inch)

Flower Width (Head width in the Asteraceae)

• 4 mm (.16 inch)
• 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)

Number of Sepals

• sepals lacking
• more than 10 sepals

Sepal Separation

• Completely free to base

Sepal Tip

• Pointed

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)
• 6 mm (.24 inch)
• 7 mm (.28 inch)
• 8 mm (.32 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

• 1 - 2 cm (.40 - .80 inch)
• 2 - 4 cm (.80 - 1.6 inches)
• 4 - 10 cm (1.6 - 4.0 inches)

Leaf Shape (simple leaves only)

• Oblong
• Oval
• Pinnately lobed
• Sagittate (arrowhead)

Leaf or Leaflet Margin

• Dentate
• Entire
• Lobed
• Parted

Leaf or Leaflet Blade Base

• Auriculate
• Clasping
• Sagittate

Leaf or Leaflet Tip

• Acute
• Rounded (obtuse)

Leaf or Leaflet Blade Surface

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

Succulence

• Not succulent

Milky Juice

• Juice milky

Woodiness

• Herbaceous

Spines or Thorns

• Spines or Thorns ABSENT
• Spines on leaves or stems

Aromatic (vegetative structures)

• Not aromatic

Life Cycle

• Annual

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)
• 1 - 1.5 meters (3.3 - 5.0 feet)

Wind Dissemination

• Fruit, seed, or spore wind borne

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

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

Canadian Province or Territory

• British Columbia
• New Brunswick
• Nova Scotia
• Ontario
• Prince Edward Island
• Quebec
• Alberta
• Manitoba
• Saskatchewan

Other

• District of Columbia

• An Illustrated Guide To Arizona Weeds, 1972 (ISBN 0-8165-0288-9) 338 pages. See page: 310
• The Biology of Canadian Weeds: Canadian Journal of Plant Science Vol:83Pg.619
• California Growers Weed Identification Handbook, 1968 - 1998 University of California Publication # 4030-1, See page: 1
• Common Weeds of Canada, Mulligan 1987 (ISBN 0-910053-59-9) See page: 123
• Common Weeds of the Canadian Prairies, 1963 (Cat# A53-1136-1) See page: 44
• Common Weeds of the United States, 1971 (ISBN 0-486-20504-5) See page: 426
• Common Weed Seedlings of the North Central States, 2001 North Central Regional Extension Publication # 607 See page: 21
• Common Weed Seedlings of the United States and Canada, 1978 Coop Ext. Univ. of Georgia, Athens, See page: 13
• Field Guide To The Common Weeds Of Kansas, 1983 (ISBN 0-7006-0233-X) See page: 122
• Fifty Important Weeds of Montana, Montana Ag. Ext. Service, 1920. 126 pages. See page: 77
• Garden Weeds of Southern California, 1981, See page: 120
• Gilkey`s Weeds of the Pacific Northwest, 1980 (ISBN 0-88246-039-0) See page: 301, 302
• How to Know the Weeds, 1972, (ISBN# 0-697-04880-2) See page: 160
• Identification Guide to the Weeds of Quebec, 1999 (ISBN# 2-89457-174-7) See page: 60
• Nebraska Weeds, 1979 Nebraska Dept. of Ag., Lincoln NE, See page: 245
• Northwest Weeds, 1990 (ISBN 0-87842-249-8) See page: 157
• Ontario Weeds, 1992 Agdex 640, Publication #505 See page: 250
• Representative Missouri Weeds and Their Control, 1941 Univ. of Missouri Ag. Exp Station Bulletin #433, See page: 201
• Selected Weeds of Oregon, 1985 and 1989 Supplement (s) Oregon State Dept. of Agriculture, See page: 87
• Some Important Michigan Weeds, 1951 Mich. Ag. Exp. Station Bulletin #304, See page: 199
• Some Weedy Plants of North Carolina, 1955 North Carolina Ag. Ext. Circular # 390, See page: 56
• South Dakota Weeds, 1967 South Dakota State University, See page: 163
• South Dakota Weeds 2002 South Dakota Dept. of Ag. 523 E. Capitol, Foss Bldg. Pierre, South Dakota 57501 See page: 175
• S.W.S.S. Weed ID Guide, 1993 Section Number and Five letter code: 13 LACSE
• Weed Seeds of the Great Plains, 1993 University of Kansas# 92-125-B ISBN# 0-7006-0651-3 See index #: 235
• Weeds, 1955 (1980) Walter Conrad Muenscher, ISBN# 0-8014-1266-8 See page: 482, 485
• Weeds, A Golden Guide, 1972 ISBN#0-307-24353-2 See page: 157
• Weeds and Poisonous Plants of Wyoming and Utah 1987 (ISBN 0-941570-06-1) See page: 198
• Weeds of Arkansas 1981 (MP 169-5M-3-81) See page: 17
• Weeds of California, 1970, State of California Publications and Documents. See page: 482, 484
• Weeds of California and other Western States, 2007 (ISBN 13: 978-1-879906-69-3) See Page: 360
• Weeds of Canada, 1970 Canada Dept. of Ag., Pub. # 948, See page: 207
• Weeds of Colorado, 1990 Cooperative Extension, Colorado State Univ. Bulletin 521A, See page: 182
• Weeds of Eastern Washington and Adjacent Areas, 1972 (LOC 72-83635) See page: 310
• Weeds of Kentucky and Adjacent States, 1991 (ISBN 0-8131-1743-7) See page: 100
• Weeds of Nebraska and the Great Plains, 1994 (ISBN 0939870-00-4) See page: 162
• Weeds of the Midwestern United States & Central Canada, University of Georgia 2010, ISBN#0-8203-3506-1 See page: 111
• Weeds of the North Central States, 1981 Univ. of Illinois, Urbana - Champaign Bulletin # 772, See page: 224
• Weeds of the Northeast, 1956, Univ. of Delaware Field Manual #1 See species #: 259
• Weeds of the Northeast, 1997 Cornell University ISBN# 0-8014-8334-4 See page: 150,158
• Weeds of the Northern United States and Canada, 1964 Montgomery See page: 197
• Weeds of the Northern U.S, and Canada, 1999 Royer and Dickinson, (ISBN# 1-55105-221-0) See page: 44 - 45
• Weeds of the South, University of Georgia 2009, ISBN#0-8203-3046-9 See page: 92
• Weeds of the Southern United States, 1975, North Carolina Ag. Extension Circular #599 See page: 13
• Weeds of the United States and Their Control, Lorenzi 1987, ISBN# 0-442-25884-4 See page: 320
• Weeds of the West, 1992 (ISBN 0941570-13-4) See page: 152
• Weeds of the West, 2000 (ISBN 0941570-13-4) See page: 154
• Weeds of Utah, 1971 UAES Special Report 21, See page: 102
• Listed as a `Weed` by the Biota of North America Program, 2008 x
• Listed in the WSSA Composite List of Weeds X
• Lactuca tatarica var. pulchella / Asteraceae / lettuce, blue
• Common Weeds of Canada, Mulligan 1987 (ISBN 0-910053-59-9) See page: 122
• Common Weeds of the Canadian Prairies, 1963 (Cat# A53-1136-1) See page: 44
• Common Weeds of the United States, 1971 (ISBN 0-486-20504-5) See page: 424
• Fifty Important Weeds of Montana, Montana Ag. Ext. Service, 1920. 126 pages. See page: 15
• Gilkey`s Weeds of the Pacific Northwest, 1980 (ISBN 0-88246-039-0) See page: 301
• How to Know the Weeds, 1972, (ISBN# 0-697-04880-2) See page: 159
• Nebraska Weeds, 1979 Nebraska Dept. of Ag., Lincoln NE, See page: 247
• Northwest Weeds, 1990 (ISBN 0-87842-249-8) See page: 157
• South Dakota Weeds, 1967 South Dakota State University, See page: 164
• South Dakota Weeds 2002 South Dakota Dept. of Ag. 523 E. Capitol, Foss Bldg. Pierre, South Dakota 57501 See page: 176
• Weeds, 1955 (1980) Walter Conrad Muenscher, ISBN# 0-8014-1266-8 See page: 482
• Weeds, A Golden Guide, 1972 ISBN#0-307-24353-2 See page: 157
• Weeds of California, 1970, State of California Publications and Documents. See page: 481
• Weeds of Canada, 1970 Canada Dept. of Ag., Pub. # 948, See page: 205
• Weeds of Colorado, 1990 Cooperative Extension, Colorado State Univ. Bulletin 521A, See page: 177
• Weeds of Eastern Washington and Adjacent Areas, 1972 (LOC 72-83635) See page: 308
• Weeds of Nebraska and the Great Plains, 1994 (ISBN 0939870-00-4) See page: 160
• Weeds of the North Central States, 1981 Univ. of Illinois, Urbana - Champaign Bulletin # 772, See page: 223
• Weeds of the Northern United States and Canada, 1964 Montgomery See page: 199
• Weeds of the Northern U.S, and Canada, 1999 Royer and Dickinson, (ISBN# 1-55105-221-0) See page: 45
• Weeds of the West, 1992 (ISBN 0941570-13-4) See page: 150
• Weeds of the West, 2000 (ISBN 0941570-13-4) See page: 152
• Weeds of Utah, 1971 UAES Special Report 21, See page: 102
• Listed as a `Weed` by the Biota of North America Program, 2008 x
• Listed in the WSSA Composite List of Weeds X