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1.Trochodendron Aralioides — Overview
Trochodendron aralioides, commonly known as the Wheel-tree or Green Ash, is a remarkable evergreen tree native to Japan, Korea, and subtropical regions of eastern and southeastern Asia. It is the sole extant species in the family Trochodendraceae and is considered a living fossil due to its relictual anatomical features, particularly its wood. This tree typically grows as a medium-sized tree, reaching heights of 10-25 meters (33-82 feet) with a broad, rounded crown. Its most striking feature is its glossy, leathery leaves, arranged in whorls at the ends of stout branches, giving it a distinctive tiered appearance. Each leaf is obovate to elliptical, dark green and highly lustrous on the upper surface, paler beneath, and measures about 8-15 cm (3-6 inches) long and 3-8 cm (1-3 inches) wide, with finely serrated margins.
The petioles are often reddish. The bark is smooth and greenish-brown when young, fissuring with age. Perhaps its most unique characteristic, from which it derives its common name 'Wheel-tree,' are its apetalous (lacking petals) flowers. These fascinating flowers appear in late spring to early summer, arranged in upright, terminal racemose inflorescences. Each flower is small, star-shaped, and greenish-yellow, featuring numerous prominent stamens arranged radially around a central gynoecium of 8-10 united carpels, resembling the spokes of a wheel.
Despite their inconspicuous coloration, the sheer number of flowers creates a subtle, elegant display. Following successful pollination, the flowers develop into small, woody, star-shaped fruit capsules containing numerous tiny seeds. Trochodendron aralioides is prized in horticulture for its unique foliage, attractive form, and architectural interest. It is a slow-growing but long-lived tree, offering year-round beauty and a sense of ancient history to the landscape.
Trusted Scientific References
1. Authoritative external sources for Trochodendron aralioides
1.1 Wikipedia — Trochodendron aralioides
1.2 Kew POWO (Plants of the World Online)
1.3 PubMed — peer-reviewed research
1.4 NCBI Taxonomy Browser
1.5 GBIF — Global Biodiversity
1.1.Trochodendron Aralioides — Key Features
- ✓ <strong>["\u2713 Sole extant</strong> — ["\u2713 Sole extant species in the family Trochodendraceae, a 'living fossil'.", "\u2713 Evergreen tree with a broad, rounded crown.", "\u2713 Glossy, leathery, dark green leaves arranged in whorls.", "\u2713 Unique apetalous (petal-less) greenish-yellow flowers resembling a wheel.", "\u2713 Flowers borne in upright, terminal racemes in late spring to early summer.", "\u2713 Produces star-shaped, woody fruit capsules.", "\u2713 Slow-growing but very long-lived.", "\u2713 Distinctive tiered branching pattern.", "\u2713 Bark is smooth and greenish-brown when young, fissuring with age.", "\u2713 Excellent specimen tree for architectural interest."]
- ✓ <strong>Identified profile</strong> — Uses the accepted plant name and practical context for Trochodendron Aralioides.
- ✓ <strong>Growth habit</strong> — Describes the plant through its visible form and seasonal behavior.
- ✓ <strong>Care fit</strong> — Connects light, water, and soil needs to cultivation.
- ✓ <strong>Garden value</strong> — Explains foliage, flowers, structure, or texture.
- ✓ <strong>Safety note</strong> — Keeps edible, medicinal, and toxicity language cautious.
- ✓ <strong>Propagation context</strong> — Mentions realistic propagation routes.
- ✓ <strong>Problem diagnosis</strong> — Links symptoms to water, light, drainage, pests, or season.
- ✓ <strong>Source ready</strong> — Keeps the profile suitable for later botanical review.
1.2.Trochodendron Aralioides — Quick Summary
- Trochodendron aralioides, the Wheel-tree, is a unique evergreen 'living fossil' tree native to East Asia.
- It boasts glossy, whorled leaves and distinctive petal-less, wheel-shaped flowers, making it a prized ornamental for its ancient beauty and architectural form.
2.Trochodendron Aralioides — Scientific Identity
3.Trochodendron Aralioides — Quick Facts
4.Trochodendron Aralioides — Appearance & Identification
5.Trochodendron Aralioides — Native Habitat
6.Trochodendron Aralioides — Water Requirements
- ✓ Site Selection — Choose a location with partial shade to full sun, protected from harsh, drying winds, mimicking its native forest understory.
- ✓ Soil Requirements — Requires well-drained, consistently moist, and acidic soil (pH 4.5-6.0) rich in organic matter. Amend heavy clay soils with compost and grit.
- ✓ Watering — Keep the soil consistently moist, especially during dry periods and in its establishment phase. Avoid waterlogging, which can lead to root rot.
- ✓ Temperature and Hardiness — Hardy in USDA Zones 6-9. Tolerates cold but prefers climates with moderate winters and cool summers.
- ✓ Propagation — Can be propagated by seeds, which often require cold stratification, or by semi-hardwood cuttings taken in late summer, though rooting can be challenging.
- ✓ Pruning — Minimal pruning is needed, primarily to remove dead, damaged, or crossing branches to maintain its natural form and health.
- ✓ Fertilization — Apply a balanced, slow-release acidic fertilizer in spring, or top-dress with compost to provide nutrients and maintain soil acidity.
- ✓ Pests and Diseases — Generally resistant to most pests and diseases, but monitor for common issues like aphids or fungal spots in overly humid conditions.
Reviewed by the Flora Medical Global Botanical Review Panel
Multi-disciplinary editorial group · Botany · Ethnobotany · Herbal-medicine literature
Who reviewed this: This page was checked by the Flora Medical Global Botanical Review Panel — an in-house editorial group of botany graduates, ethnobotany researchers, and horticulture practitioners who collectively maintain our 7,000+ plant encyclopedia. Meet the team.
Our 4-step verification process
1. Taxonomic verification
Scientific names and synonyms cross-checked against Kew POWO, World Flora Online, and The Plant List.
2. Phytochemical & medicinal cross-reference
Active compounds, traditional uses, and reported activities are cross-referenced with PubMed, USDA Dr. Duke's database, and peer-reviewed ethnobotanical literature.
3. Conservation & distribution check
Distribution, ecology, and conservation status confirmed against GBIF occurrence records and the IUCN Red List.
4. Editorial & safety review
Every entry passes an editorial pass for clarity, originality, and safety notices (toxicity, contraindications, dosage caveats) before publication.
Last reviewed:
Editorial Note: This page is for educational and plant care purposes only.
Written by: Flora Medical Global Editorial Team
Reviewed by: Flora Medical Global Botanical Review Panel
Last Updated: June 15, 2026
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