Weed Information: Quercus marilandica (oak, blackjack)
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Quercus marilandica (oak, blackjack)

Family: Fagaceae

Description

Leaves very broadly ovate; lobes very shallow and rounded. Small tree or large shrub.

Characteristics

Flower Color
  • Red (or pink)
  • Yellow-green
  • Green
Inflorescence Type (How the flowers are arranged on the plant)
  • Axillary cluster
  • Axillary spikes
  • Internodal cluster
  • Solitary, axillary
  • Catkin (ament, cone)
Number of Petals
  • 0 (no petals)
Flower Symmetry
  • Flowers regular
Flower Length (Head length in the Asteraceae)
  • 1 mm (.04 inch)
  • 2 mm (.08 inch)
  • 3 mm (.12 inch)
Flower Width (Head width in the Asteraceae)
  • 1 mm (.04 inch)
  • 2 mm (.08 inch)
  • 3 mm (.12 inch)
Number of Sepals
  • 5 sepals
  • 6 sepals
Sepal Separation
  • United from 25% - 75% length
Sepal Tip
  • Pointed
  • Rounded
Flower Sex
  • Unisexual (monoecious or dioecious)
Number of Styles
  • Styles lacking (male flowers only)
  • 3 styles
Number of Stamens
  • stamens lacking (female flowers only)
  • 5 stamens
  • 6 stamens
  • 7 stamens
  • 8 stamens
  • 9 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
  • 0 (male flowers only or plants producing spores)
  • 3 carpels
Ovary Position
  • Inferior (epigynous)
Fruit Length at Maturity
  • 1.5 cm (.60 inch)
  • 2.0 cm (.80 inch)
Fruit Width at Maturity
  • 1.0 cm (.40 inch)
  • 1.5 cm (.60 inch)
  • 2.0 cm (.80 inch)
Burs
  • Fruit or seed NOT bur-like
Fruit Type
  • Nut

Leaf Arrangement
  • Alternate
Leaf Type
  • Simple (including lobed leaves)
Stipules
  • Foliaceous 2-4 mm (.08 - .16 in) long
  • Lacking
Tendrils
  • Tendrils absent
Venation
  • Pinnate
Petiole (leaf stem) Blade Ratio
  • Petiole < 25% total length
Leaf Length (blade PLUS petiole)
  • 1 - 2 dm (4.0 - 8.0 inches)
Leaf Width
  • 1 - 2 dm (4.0 - 8.0 inches)
Leaf Shape (simple leaves only)
  • Ovate
  • Palmately 3 lobed
  • Palmately 4 - 5 lobed
Leaf or Leaflet Margin
  • Lobed
Leaf or Leaflet Blade Base
  • Cordate
  • Rounded
Leaf or Leaflet Tip
  • Mucronate
  • Rounded (obtuse)
Leaf or Leaflet Blade Surface
  • Glabrous (NO hairs)
  • Lower leaf surface more hairy
  • Pubescent
Succulence
  • Not succulent

Milky Juice
  • Juice NOT milky (watery)
Woodiness
  • Woody
Spines or Thorns
  • Spines or Thorns ABSENT
Aromatic (vegetative structures)
  • Not aromatic
Life Cycle
  • Perennial
Growth Habit (while flowering)
  • Erect, columnar (narrow)
  • Erect, spherical (bushy)
Plant Height at Maturity
  • more than 5.0 meters (16.6 33 feet)
Wind Dissemination
  • Not wind disseminated
Moisture Regime
  • Mesic
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
  • Delaware
  • Florida
  • Georgia
  • Illinois
  • Kansas
  • Kentucky
  • Louisiana
  • Missouri
  • Mississippi
  • North Carolina
  • New Jersey
  • New York
  • Ohio
  • Pennsylvania
  • South Carolina
  • Tennessee
  • Texas
  • Virginia
  • West Virginia
  • Indiana
  • Maryland
  • Iowa
  • Oklahoma
  • Nebraska
Other
  • District of Columbia

  • Listed as a `Weed` by the Biota of North America Program, 2008 x
  • Listed in the WSSA Composite List of Weeds X
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