Granadillo (Platymiscium pinnatum) is a medium-sized to large tropical tree of the legume family (Fabaceae), prized for its extraordinarily dense, richly colored heartwood that ranges from golden-orange to deep reddish-brown with dark streaks. Native to the tropical forests of Central and South America, this important timber species produces wood so hard and durable that it has been used for centuries for railway ties, heavy construction, and fine woodworking. The species is also ecologically significant as a nitrogen-fixing legume that enriches the soils of tropical forests.
• Produces one of the hardest and most durable tropical timbers in the Americas
• Also known as Roble, Nambar, or Quira in different parts of its range
• Wood is so dense it sinks in water
• A nitrogen-fixing legume that enriches forest soils
• The genus Platymiscium contains approximately 15 species distributed across the Neotropics
Taxonomie
• Distributed from southern Mexico through Central America (Belize, Guatemala, Honduras, Nicaragua, Costa Rica, Panama) to Colombia, Venezuela, Ecuador, Peru, and Brazil
• Found in tropical dry forests, deciduous forests, and transitional forests between dry and wet zones
• Occurs from sea level to approximately 800 m elevation
• Prefers well-drained sites in areas with a pronounced dry season
• Often found on hillsides and in open, seasonally dry woodlands
• First described by the German botanist Adelbert von Chamisso and the Prussian botanist Diederich Franz Leonhard von Schlechtendal
• The species has been heavily exploited for its valuable timber throughout its range
• Several other Platymiscium species produce similarly valuable wood and are known by the same common names
• The timber is sometimes marketed as "Central American Rosewood" though it is not a true rosewood (Dalbergia)
Trunk and Crown:
• Height: 15-30 m with a straight to somewhat irregular bole
• Trunk diameter: 40-80 cm
• Bark: grayish-brown, rough, deeply fissured, sometimes shedding in thin plates
• Crown: rounded to spreading, moderately dense
• Branches are ascending, forming a broad canopy
Leaves:
• Alternate, bipinnately compound (twice-divided), 15-30 cm long
• 4-8 pairs of pinnae, each bearing 4-10 pairs of small leaflets
• Leaflets are ovate-elliptic to oblong, 2-5 cm long and 1-2.5 cm wide
• Dark green above, paler beneath, with a prominent midrib
• Petioles 2-5 cm long, often with small glands
• Deciduous, shedding leaves during the dry season
Flowers:
• Small, bright yellow to golden-yellow, pea-like (papilionaceous), 8-12 mm long
• Arranged in showy, dense, paniculate inflorescences 8-15 cm long
• Flowering occurs during the dry season when the tree is leafless
• Highly attractive to bees and other pollinating insects
Fruit:
• A flattened, elliptic to ovate, samaroid pod (winged fruit) 5-10 cm long and 2-4 cm wide
• Green when immature, turning light brown and papery at maturity
• Contains 1-2 seeds
• The wing-like pod enables wind dispersal
• Pods often remain on the tree for extended periods after maturity
Wood:
• Heartwood: golden-orange to deep reddish-brown with darker streaks
• Extremely dense (specific gravity 0.85-1.05), hard, and durable
• Fine, even texture with interlocked grain
• One of the hardest tropical timbers of the Americas
• A nitrogen-fixing legume that enriches soil through symbiotic Rhizobium bacteria in root nodules
• Plays a critical role in maintaining soil fertility in nutrient-poor tropical dry forests
• Flowers provide an important nectar and pollen source for bees during the dry season
• The tree is a valuable honey plant, producing high-quality honey from its nectar
• Fruits (winged pods) are wind-dispersed, enabling colonization of new areas
• Deciduous habit returns nutrients to the soil through leaf litter decomposition during the dry season
• Provides shade and habitat for wildlife in seasonally dry tropical forests
• The dense, durable wood is highly resistant to decay and insect attack, contributing to long-term carbon storage
• Important component of tropical dry forests, one of the most threatened tropical ecosystems
• Seedlings are moderately shade-tolerant but require canopy gaps for optimal growth
• Requires tropical to subtropical conditions with annual rainfall of 800-2,000 mm
• Prefers well-drained soils and is adapted to seasonally dry conditions
• Tolerates a wide range of soil types including rocky, shallow soils
• Propagation is by seed; seeds should be collected from mature, dry pods
• Seeds germinate within 7-21 days after scarification (nicking the seed coat)
• Soaking seeds in warm water for 24 hours also improves germination
• Seedlings grow moderately fast, reaching 1-2 m in the first year
• Requires full sun for optimal growth after the seedling stage
• Planting densities of 200-400 trees per hectare for timber production
• Rotation cycles of 25-40 years produce commercial-grade heartwood
• Responds well to pruning to develop a straight, clean bole
• Fixes nitrogen, making it an excellent species for agroforestry and soil rehabilitation
• Drought-tolerant once established
Wusstest du schon?
Granadillo wood is so dense that it sinks in water, with a specific gravity exceeding 1.0, meaning it is literally heavier than water. This extraordinary density makes it one of the few woods suitable for use as railway ties without chemical treatment, and it has been used for this purpose throughout Central America since the 19th century. Many historic railways in the region were laid on Granadillo ties that are still intact after over 100 years of service.
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