Cladrastis kentukea
Overview
American Yellowwood is a relatively uncommon native hardwood tree prized for its graceful form, smooth bark, and spectacular displays of fragrant white flowers. Although it occurs naturally only in limited portions of the eastern United States, it is considered an Appalachia-native species and is especially associated with Kentucky, Tennessee, North Carolina, and neighboring states.
Often regarded as one of the finest flowering trees of the region, American Yellowwood combines ornamental beauty with a distinctive growth habit. Its rounded crown, smooth gray bark, and cascading flower clusters make it a popular specimen tree in arboretums, botanical gardens, and campus landscapes.
Identification
Leaves
- Alternate leaf arrangement
- Compound leaves with 7 to 11 leaflets
- Bright green during the growing season
- Clear yellow fall color
Bark
- Smooth, gray bark similar to young American Beech
- Remains relatively smooth even on older trees
- Develops subtle ridges with age
Flowers
- Produces large, drooping clusters of fragrant white flowers
- Blooms in late spring after leaves emerge
- Flower clusters may reach 10 to 15 inches in length
- Flowering can be especially abundant on mature trees
Fruit
- Flat, bean-like seed pods
- Persist into late summer and fall
- Typical of members of the pea family
Size
- Typically grows 30 to 50 feet tall
- Mature spread of 40 to 55 feet
- Develops a broad, rounded canopy
Native Range
American Yellowwood is native to portions of the Appalachian region and eastern United States. It naturally occurs on limestone slopes, wooded hillsides, and rich forest sites, often in scattered populations.
Although not common in the wild, American Yellowwood has become widely planted as an ornamental tree because of its striking flowers, attractive bark, and manageable size.
Ecology and Wildlife Value
American Yellowwood supports a variety of pollinators through its abundant spring flowers. Bees and other insects visit the fragrant blooms during the flowering season.
As a medium-sized native tree, American Yellowwood contributes to forest diversity and provides cover and habitat for wildlife. Its flowers also add seasonal resources to pollinator communities within both natural and managed landscapes.
Human Uses and Cultural Significance
American Yellowwood derives its common name from the distinctive yellow color of its heartwood. Early settlers reportedly used the wood to produce yellow dyes.
The tree is highly valued as an ornamental landscape species because of its:
- Showy white flower clusters
- Attractive smooth bark
- Graceful branching structure
- Golden fall foliage
- Moderate size
Although the wood has been used for specialty woodworking applications, American Yellowwood is primarily appreciated today for its ornamental qualities.
American Yellowwood at Marshall University
American Yellowwood contributes unique seasonal interest to the Marshall University Arboretum. Its fragrant white flower clusters create one of the most striking floral displays found among the arboretum’s trees, while its smooth bark and attractive form provide year-round appeal.
As a native Appalachian species with a relatively limited natural distribution, American Yellowwood also highlights the botanical diversity of the region and the importance of conserving native tree species.
Quick Facts
Common Name: American Yellowwood
Scientific Name: Cladrastis kentukea
Family: Fabaceae
Native Region: Appalachia Native
Mature Height: 30-50 feet
Mature Spread: 40-55 feet
Growth Rate: Slow to Moderate
Sun Requirements: Full Sun to Partial Shade
Soil Preferences: Rich, moist, well-drained soils
USDA Hardiness Zones: 4-8
Bloom Period: May to June
Fruit/Seed: Flat seed pods typical of the pea family
Wildlife Value: Supports pollinators and contributes to habitat diversity
Notable Characteristics: Cascading white flower clusters, smooth gray bark, and yellow heartwood