Flower Color

• Green

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

• Axillary spikes
• Terminal spike

Number of Petals

• 0 (no petals)
• 4 petals

Petal Separation

• Completely free to base

Petal Tip

• Rounded

Flower Symmetry

• Flowers regular

Flower Length (Head length in the Asteraceae)

• 1 mm (.04 inch)
• 2 mm (.08 inch)

Flower Width (Head width in the Asteraceae)

• 2 mm (.08 inch)
• 3 mm (.12 inch)
• 4 mm (.16 inch)

Number of Sepals

• sepals lacking
• 4 sepals

Sepal Separation

• Completely free to base

Sepal Tip

• Rounded

Flower Sex

• Bisexual (perfect)

Number of Styles

• 4 styles

Number of Stamens

• 4 stamens

Stamens Attached to the Petals

• Stamens NOT attached to the petals

Stamens Connate (united)

• Filaments or anthers NOT united

Carpel Separation

• Carpels separated

Number of Carpels

• 4 carpels

Ovary Position

• Superior (hypogynous)

Fruit Type

• Achene

Fruit Length at Maturity

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

Fruit Width at Maturity

• 2 mm (.08 inch)
• 3 mm (.12 inch)

Burs

• Fruit or seed NOT bur-like

Leaf Arrangement

• Alternate

Leaf Type

• Simple (including lobed leaves)

Stipules

• Membranous, entire

Tendrils

• Tendrils absent

Venation

• Arcuate
• Parallel
• Pinnate

Petiole (leaf stem) Blade Ratio

• Petiole < 25% total length
• Petiole 25% - 75% total length
• Petiole > 75% total length

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
• Lanceolate
• Linear or filiform
• Oval

Leaf or Leaflet Margin

• Entire

Leaf or Leaflet Blade Base

• Acute (cuneate)
• Rounded

Leaf or Leaflet Tip

• Acuminate (attenuate)
• Acute
• Mucronate

Leaf or Leaflet Blade Surface

• Glabrous (NO hairs)

Succulence

• Not succulent

Milky Juice

• Juice NOT milky (watery)

Woodiness

• Herbaceous

Spines or Thorns

• Spines or Thorns ABSENT

Aromatic (vegetative structures)

• Not aromatic

Life Cycle

• Perennial

Plant Height at Maturity

• 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)
• 1.5 - 2.0 meters (5.0 - 6.6 feet)
• 2 - 2.5 meters (6.6 - 8.3 feet)

Wind Dissemination

• Not wind disseminated

Moisture Regime

• Aquatic

Chlorophyll

• Present

Growth Habit (while flowering)

• Floating
• Submerged (mostly or totally)

Stem Cross Section

• Round

Flowering Stem Leaves

• Stem leaves greatly reduced
• Stem uniformly leafy

Main Stem Branches

• Main stem unbranched
• Main stem branched

Root or Vegetative Propagule

• Rhizomatous

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
• Quebec
• Alberta
• Saskatchewan

Other

• Puerto Rico
• District of Columbia
• Labrador

• Aquatic and Riparian Plants of the West, 2003 (ISBN# 1-879906-59-7) See page: 118
• Common Weeds of the United States, 1971 (ISBN 0-486-20504-5) See page: 16
• Weeds of the United States and Their Control, Lorenzi 1987, ISBN# 0-442-25884-4 See page: 39
• Listed as a `Weed` by the Biota of North America Program, 2008 x
• Listed in the WSSA Composite List of Weeds X