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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