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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.
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Characteristics
Flowers
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
Fruit
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
Leaves
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
General
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
Stem Cross Section
Round
Flowering Stem Leaves
Stem uniformly leafy
Main Stem Branches
Main stem branched
Root
Root or Vegetative Propagule
Tap Root
Geography
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
References
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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