Flower Color

• Yellow

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

• Axillary racemes
• Terminal raceme

Number of Petals

• 5 petals

Petal Separation

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

Petal Tip

• Bilobed
• Rounded

Flower Symmetry

• Flowers strongly irregular

Flower Length (Head length in the Asteraceae)

• 1.0 cm (.40 inch)
• 1.5 cm (.6 inch)
• 2.0 cm (.8 inch)
• 2.5 cm (1.0 inch)
• 3.0 cm (1.2 inches)

Flower Width (Head width in the Asteraceae)

• 1.0 cm (.40 inch)
• 1.5 cm (.60 inch)
• 2.0 cm (.80 inch)

Number of Sepals

• 5 sepals

Sepal Separation

• United from 25% - 75% length
• United > 75% of length

Sepal Tip

• Pointed

Flower Sex

• Bisexual (perfect)

Number of Styles

• 1 style

Number of Stamens

• 10 stamens

Stamens Attached to the Petals

• Stamens NOT 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

• Superior (hypogynous)

Fruit Type

• Capsule, 1-celled
• Legume

Fruit Length at Maturity

• 4.0 cm (1.6 inches)
• 4.5 cm (1.8 inches)
• 5.0 cm (2.0 inches)
• 6.0 cm (2.4 inches)
• 7.0 cm (2.8 inches)
• 8.0 cm (3.2 inches)
• 9.0 cm (3.6 inches)

Fruit Width at Maturity

• 4 mm (.16 inch)
• 5 mm (.20 inch)
• 6 mm (.24 inch)
• 7 mm (.28 inch)

Burs

• Fruit or seed NOT bur-like

Leaf Arrangement

• Alternate

Leaf Type

• Trifoliolate (3 leaflets)

Stipules

• Foliaceous 4-10 mm (.16 - .40 in) long
• Foliaceous > 1 cm (> .40 inch) long

Tendrils

• Tendrils absent

Venation

• Pinnate

Petiole (leaf stem) Blade Ratio

• Petiole 25% - 75% total length

Leaf Length (blade PLUS petiole)

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

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 or Leaflet Margin

• Entire

Leaf or Leaflet Blade Base

• Acute (cuneate)
• Rounded

Leaf or Leaflet Tip

• Acute
• Rounded (obtuse)

Leaf or Leaflet Blade Surface

• Glabrous (NO hairs)
• Puberulent
• Pubescent
• Sericeous or villous (silky)
• Villous or sericious (silky)

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

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

• Not wind disseminated

Moisture Regime

• Seasonally saturated
• Mesic

Chlorophyll

• Present

Stem Cross Section

• Round

Flowering Stem Leaves

• Stem uniformly leafy

Main Stem Branches

• Main stem unbranched
• Main stem branched

Root or Vegetative Propagule

• Rhizomatous
• Tap Root

US State

• Arizona
• Colorado
• Idaho
• Montana
• New Mexico
• Nevada
• Oregon
• Utah
• Washington
• Wyoming

• Weeds of the West, 1992 (ISBN 0941570-13-4) See page: 347
• Weeds of the West, 2000 (ISBN 0941570-13-4) See page: 345
• Listed as a `Weed` by the Biota of North America Program, 2008 x