Smooth Hydrangea (also known as Wild Hydrangea or Sevenbark)
Kingdom: Plantae > Division: Tracheophyta > Class: Magnoliopsida > Order: Cornales > Family: Hydrangeaceae > Genus: Hydrangea > Species: Hydrangea arborescens · Hydrangeaceae (Hydrangea family) · Simple, Deciduous
Species
Hydrangea arborescens (High confidence)
Leaf Type
Simple, Deciduous
Family
Hydrangeaceae (Hydrangea family)
Shape
Ovate to broadly cordate (heart-shaped at the base) with an acuminate tip
Size
Approximately 3.5 to 5 inches wide and 4 to 6 inches long; typical range for this species is 3 to 7 inches in length.
Margin
Coarsely serrate (toothed margins)
Arrangement
Opposite arrangement along the stem
Rarity
Common (frequently found in native woodland habitats and very popular in home landscapes).
Color & Pattern
Medium to light green with subtle interveinal chlorosis (yellowish mottling between dark green veins), lighter green undersides, and yellowish petiole stems.
Venation Pattern
Pinnate to prominent palmate-pinnate structure at the base, with deeply impressed reticulate sub-veins.
Texture & Surface
Matte surface on top, slightly rugose (wrinkled) between veins, paper-like texture, mostly glabrous (smooth) to sparsely pubescent underneath.
Description
A loose, open, deciduous understory shrub growing 3 to 6 feet tall. It is renowned for its large, rounded, white to lime-green flower clusters that bloom in mid-to-late summer. Leaves are opposite, heart-shaped, and dark to medium green, turning yellow-brown in autumn before shedding.
Key Features
Opposite, broad ovate-cordate leaves with sharply serrate margins, slender pale stems, and large terminal corymbs of creamy white flowers.
Habitat
Moist, rich woodlands, rocky slopes, ravine edges, and stream banks; thrives in partial shade to full sun with adequate moisture.
Geographic Range
Native to the eastern and central United States (from New York south to Florida and west to Oklahoma); widely cultivated globally as an ornamental shrub.
Condition Notes
Fair condition; leaves show noticeable interveinal chlorosis (mottled yellowing between veins) indicative of a micro-nutrient deficiency (such as iron or magnesium) or high soil pH, alongside minor physical insect or mechanical edge damage near the tip.
Interesting Facts
The common name 'Sevenbark' comes from the multi-layered, peeling bark on older stems, which reveals several different colored inner bark layers. Cultivars like 'Annabelle' are widely celebrated in horticulture for their massive snow-ball blooms.
Medicinal & Uses
Historically used by Native Americans (such as the Cherokee) and early settlers as a kidney and bladder tonic to treat gravel and kidney stones. Popular today primarily as an ornamental landscape shrub.
Ecological Role
Serves as an important source of nectar for native bees, butterflies, and pollinators when wild non-sterile cultivars bloom. Provides lower canopy shelter for birds and small wildlife.
Similar Species
Hydrangea macrophylla (Bigleaf Hydrangea - leaves are glossier and thicker), Viburnum species (often have different leaf margins, glands, or berry clusters), and Tilia americana (American Basswood - tree habit, alternate leaf arrangement).
Foraging Tips
Look in shaded wood borders and near streams in late spring and summer. Check for opposite leaf pairing and slender, yellowish-green stems with distinct jointed nodes.
Toxicity Warning
Moderately Toxic; all parts of the plant contain cyanogenic glycosides (hydrangin), which can cause gastrointestinal distress, nausea, vomiting, and dizziness if ingested by humans or domestic animals.