Smooth Hydrangea, Wild Hydrangea, Sevenbark
Kingdom: Plantae, Division: Tracheophyta, Class: Magnoliopsida, Order: Cornales, Family: Hydrangeaceae, Genus: Hydrangea, Species: Hydrangea arborescens · Hydrangeaceae (Hydrangea family) · Simple, deciduous
Species
Hydrangea arborescens (cultivar 'Annabelle' likely)
Leaf Type
Simple, deciduous
Family
Hydrangeaceae (Hydrangea family)
Shape
Ovate to broadly cordate (heart-shaped) with a pointed tip (acuminate apex)
Size
Approximately 3-7 inches long and 2-6 inches wide. This specimen shows mature leaves within the typical range for the species.
Margin
Coarsely serrate (toothed)
Arrangement
Opposite (two leaves per node, emerging across from each other)
Rarity
Very Common; frequently used in landscaping worldwide and widely distributed in its native woodland range.
Color & Pattern
Deep matte green on the upper surface, often a lighter grayish-green beneath. No variegation is present; some minor chlorosis (yellowing) is visible on older lower leaves.
Venation Pattern
Pinnate with prominent secondary veins that curve toward the leaf tip
Texture & Surface
Relatively smooth (glabrous) upper surface with a thin, papery texture compared to the leathery leaves of other hydrangea species.
Description
A deciduous shrub growing 3 to 6 feet tall with a rounded, suckering habit. The plant features large, dark green leaves and produce flat-topped clusters (corymbs) of small white flowers. Cultivars like 'Annabelle' produce much larger, globular flower heads composed mostly of sterile sepals.
Key Features
Opposite, serrated, heart-shaped leaves; grayish-green undersides; peeling bark on older stems (hence 'Sevenbark'); and distinct white flower lacecaps or globes.
Habitat
Found in moist, rich woods, rocky slopes, and near stream banks in dappled sunlight or partial shade.
Geographic Range
Native to the Eastern United States, ranging from New York to Florida and west to Oklahoma and Kansas.
Condition Notes
Good health overall. Most leaves are vibrant green, though there is evidence of minor insect herbivory (small holes) and some localized browning/necrosis on a few lower leaves, likely due to heat stress or natural aging.
Interesting Facts
The name 'Sevenbark' refers to the tendency of the bark to peel off in several thin, different colored layers. Unlike the famous Bigleaf Hydrangea, the flower color of H. arborescens does not change based on soil pH.
Medicinal & Uses
Historically used by Native Americans for kidney and bladder stones. In modern times, it is primarily a popular ornamental landscape plant due to its ability to bloom on new wood each year.
Ecological Role
Provides cover for small wildlife and serves as a nectar source for bees, butterflies, and beetles during the mid-summer bloom period.
Similar Species
Hydrangea macrophylla (leathery leaves, glossy), Hydrangea quercifolia (lobed, oak-like leaves), and Viburnum species (which often have more prominent rugose texture).
Foraging Tips
Look for colonizing shrubs in moist ravines or understory forests. Identify in summer by the white rounded flower heads and the thin, opposite leaves with serrated edges.
Toxicity Warning
Moderately Toxic; all parts of the plant contain cyanogenic glycosides (hydrangin). Ingestion can cause nausea, vomiting, and sweating in humans and pets.