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- Benthamidia japonica
Benthamidia japonica — kousa big-bracted-dogwood
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Facts
Kousa big-bracted-dogwood is notable for its very large white inflorescences. However, the showy white "petals" are actually bracts -- modified leaves that sit below the cluster of tiny flowers and may help to attract pollinators. The flowers mature into a fleshy, aggregate fruit. This species is distinguished from its widespread congener, Benthamidia florida, by the shape of those bracts: they taper into a point in B. japonica and are blunt in B. florida. The species is native to Asia.
Habitat
Anthropogenic (man-made or disturbed habitats), meadows and fields
New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
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Characteristics
- Habitat
- terrestrial
- New England state
- Connecticut
- Growth form
-
- the plant is a shrub (a woody plant with several stems growing from the base)
- the plant is a tree
- Leaf type
- the leaf blade is simple (lobed or unlobed but not separated into leaflets)
- Leaves per node
- there are two leaves per node along the stem
- Leaf blade edges
- the edge of the leaf blade has no teeth or lobes
- Leaf duration
- the leaves drop off in winter (or they wither but persist on the plant)
- armature on plant
- the plant does not have spines, prickles, or thorns
- Leaf blade length
- 40–110 mm
- Leaf blade width
- 36–50 mm
- Leaf stalk
- the leaves have leaf stalks
- Fruit type (general)
- the fruit is fleshy
- Bark texture
- the bark of an adult plant is thin and smooth
- Twig winter color
-
- brown
- gray
- red
- white
- Bud scale number
- there are two scales on the winter bud, and their edges meet
-
Buds or leaf scars
- Bud scale number
- there are two scales on the winter bud, and their edges meet
- Bud scar shape (Fraxinus)
- NA
- Collateral buds
- there are no collateral buds on the sides of the branches
- Leaf scar arrangement
- there are two leaf scars per node on the stem or twig
- Superposed buds
- there are no superposed buds on the branch
- Winter bud scale hairs
- the winter bud scales are hairy
- Winter bud scales
- the winter bud is perulate (partially or completely covered with one or more scales)
- Winter bud shape
- the winter buds are globose (spherical, globe-shaped)
- Winter bud stalks
- the winter buds have no stalks
-
Flowers
- Anther color
-
- the anthers show no hint of a pink, reddish or purplish tint
- there is a noticeable pink, reddish or purplish tint to the anthers
- Carpels fused
- the carpels are fused to one another
- Enlarged sterile flowers
- there are no enlarged sterile flowers on the plant
- Flower petal color
-
- white
- yellow or green
- Flower symmetry
- there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
- Hairs on ovary (Amelanchier)
- NA
- Hypanthium present
- the flower does not have a hypanthium
- Inflorescence hairs
- there are hairs on some part of the inflorescence
- Inflorescence type
- the inflorescence is a pseudanthium (a cluster of small flowers that appear to be one flower, as in the flower head of the composite family, Asteraceae)
- Number of pistils
- 1
- Ovary position
- the ovary is below the point of petal and/or sepal attachment
- Petal and sepal arrangement
- the flower includes two cycles of petal- or sepal-like structures
- Petal appearance
- the petals are thin and delicate, and pigmented (colored other than green or brown)
- Petal fusion
- the perianth parts are separate
- Sepal cilia (Ilex)
- NA
- Sepal tip glands
- there are no glands at the tips of the sepal lobes
- Sepals fused only to sepals
- the sepals are fused to each other (not other flower parts), at least near their bases
- Stamen number
- 4
- Stamen position relative to petals
- the stamens are lined up with the sepals (antesepalous)
-
Fruits or seeds
- Berry color
-
- NA
- red
- Fruit type (general)
- the fruit is fleshy
- Fruit type (specific)
-
- the fruit is a drupe (fleshy, with a firm inner ovary wall that encloses a single seed)
- the fruit is a multiple (composed of two or more ovaries from separate flowers)
- Nut with spines (Fagaceae)
- NA
- Wings on fruit
- there are no wings on the fruit
-
Glands or sap
- Sap color
- the sap is clear and watery
- Stalked glands on fruit (Rosa)
- NA
-
Growth form
- Growth form
-
- the plant is a shrub (a woody plant with several stems growing from the base)
- the plant is a tree
-
Leaves
- Hairs on underside of leaf blade
- the underside of the leaf has hairs on it
- Hairs on upper side of leaf blade
- the upper side of the leaf is not hairy, or has very few hairs
- Leaf blade base shape
-
- the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
- the base of the leaf blade is rounded
- Leaf blade base symmetry
- the leaf blade base is symmetrical
- Leaf blade bloom
- there is a noticeable powdery or waxy bloom on the underside of the leaf
- Leaf blade edges
- the edge of the leaf blade has no teeth or lobes
- Leaf blade edges (Acer)
- NA
- Leaf blade flatness
-
- the edges of the leaf are curled up
- the leaf is flat (planar) at the edges
- Leaf blade hairs
-
- the hairs on the leaf blade are different from the choices given
- the leaf blade has tangled or woolly-looking hairs, without glands
- Leaf blade length
- 40–110 mm
- Leaf blade scales
- there are no scales on the leaf blades
- Leaf blade shape
-
- the leaf blade is elliptic (widest near the middle and tapering at both ends)
- the leaf blade is ovate (widest below the middle and broadly tapering at both ends)
- Leaf blade texture
-
- the leaf blade is chartaceous (thin and dry like paper)
- the leaf blade is herbaceous (has a leafy texture)
- Leaf blade translucent dots
- there are no translucent dots on the leaf blade
- Leaf blade vein pattern
- the main veins of the leaf blade are pinnate (the secondary veins branch off at intervals from the main central vein) and non-arcuate (not arched towards the leaf tip)
- Leaf blade veins
- the leaf blade has one main vein running from the base toward the tip
- Leaf blade width
- 36–50 mm
- Leaf duration
- the leaves drop off in winter (or they wither but persist on the plant)
- Leaf form
- the plant is broad-leaved (with broadly flattened leaf blades)
- Leaf lobe tips (Quercus)
- NA
- Leaf midrib glands
- the midrib of the leaf blade lacks glands on the upper surface
- Leaf stalk
- the leaves have leaf stalks
- Leaf stalk attachment to leaf
- the petiole attaches at the basal margin of the leaf blade
- Leaf stalk nectaries
- there are no nectaries on the leaf stalk
- Leaf stalk shape
- the leaf stalk is not flattened
- Leaf teeth
- the edge of the leaf blade is entire (has no teeth or lobes)
- Leaf teeth hairs (Carya)
- NA
- Leaf type
- the leaf blade is simple (lobed or unlobed but not separated into leaflets)
- Leaves per node
- there are two leaves per node along the stem
- Specific leaf type
- the leaves are simple (lobed or unlobed but not separated into leaflets
- Stipules
- there are no stipules on the plant, or they fall off as the leaf expands
-
Place
- Habitat
- terrestrial
- New England state
- Connecticut
- Specific habitat
-
- man-made or disturbed habitats
- meadows or fields
-
Scent
- Plant odor
- the plant does not have much of an odor, or it has an unpleasant or repellant odor
-
Stem, shoot, branch
- Aerial roots
- the plant has no aerial roots
- Bark texture
- the bark of an adult plant is thin and smooth
- Branch brittleness (willows only)
- NA
- Branch cross-section
- the branch is circular in cross-section, or it has five or more sides, so that there are no sharp angles
- First-year cane (Rubus)
- NA
- Lenticels on twigs
- there are clearly lenticels on the twigs
- Pith shape
- the outline of the pith in a twig is roughly round
- Pith type
- the pith inside the twig is solid, completely filled with spongy tissue
- Short shoots
- there are no peg- or knob-like shoots present
- Twig bloom
- there is no bloom on the twig
- Twig hairs
- the twigs have few or no hairs on them
- Twig papillae (Vaccinium species only)
- NA
- Twig scales
- there are no scales on the twig surface
- Twig winter color
-
- brown
- gray
- red
- white
- Wings on branch
- the branch does not have wings on it
- armature on plant
- the plant does not have spines, prickles, or thorns
Wetland status
Not classified
In New England
Distribution
- Connecticut
- present
- Maine
- absent
- Massachusetts
- absent
- New Hampshire
- absent
- Rhode Island
- absent
- Vermont
- absent
Conservation status
None
From Flora Novae Angliae dichotomous key
2. Benthamidia japonica (Siebold & Zucc.) Hara E
kousa big-bracted-dogwood. Benthamia japonica Siebold & Zucc.; B. kousa (Buerger ex Miq.) Nakai; Cornus kousa Buerger ex Miq.; Dendrobenthamia japonica (Siebold & Zucc.) W.P. Fang • CT. Fields, roadsides, waste areas.
Native to North America?
No
Sometimes confused with
Synonyms
- Benthamia japonica Siebold & Zucc.
- Benthamia kousa (Buerger ex Miq.) Nakai
- Cornus kousa Buerger ex Miq.
- Dendrobenthamia japonica (Siebold & Zucc.) W.P. Fang