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ZygophyllaceaeEN

Guayacán Real

Guaiacum sanctum

12 min read
Also available in:Español
Guayacán Real

Native Region

Central America and Caribbean

Max Height

8-15 meters

Family

Zygophyllaceae

Conservation

EN

Uses

Self-lubricating bearings (historic)Premium wood carvingsTraditional medicineOrnamental (flowers)Scientific instruments (historic)Conservation plantings

Season

Flowering

Mar-Apr

Fruiting

Jun-Jul

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
FlowersFruits

🛡️Safety Information

Toxicity Level
🔵Low
Toxic Parts:
resinwood extract
Skin Contact Risk
🔵Low
Allergen Risk
🔵Low
✅
Child Safe
Yes
✅
Pet Safe
Yes

Toxicity Details

The tree itself is safe. The resin and wood extracts have been used medicinally for centuries but can cause gastrointestinal irritation (diarrhea, stomach upset) or skin rashes in higher medicinal doses. Food-flavoring amounts are generally recognized as safe. Not toxic to touch or be around. The wood dust during woodworking is not particularly allergenic compared to other tropical hardwoods.

Skin Contact Risks

Generally safe. The resin may cause mild skin irritation or allergic reactions in sensitive individuals, but this is uncommon. Normal contact with the tree, bark, or wood is not irritating.

Allergenic Properties

LOW allergen risk. Wood dust may cause mild respiratory irritation during sanding (standard woodworking precaution). Not among highly allergenic woods. The resin has low allergenicity.

Guayacán Real (Lignum Vitae - The Heaviest Wood)

⚠️CITES Protected - Endangered Species

Guayacán Real (Guaiacum sanctum), known internationally as Lignum Vitae ("Wood of Life"), produces what may be the world's densest commercial wood—so heavy it sinks in water and so hard it's self-lubricating. These extraordinary properties led to centuries of overexploitation, and this slow-growing tree is now Endangered and protected under CITES Appendix II. With its stunning deep blue flowers and evergreen foliage, the Guayacán Real is both a botanical treasure and a cautionary tale about unsustainable resource extraction.

Quick Reference

🌿

iNaturalist Observations

Community-powered species data

290+

Observations

186

Observers

View Species Page ↗Browse Photos ↗🇨🇷 Costa Rica Only ↗

📸 Photo Gallery

Photos sourced from iNaturalist community science database. View all observations →↗


Taxonomy and Classification

Plantae
Angiosperms
Eudicots
Zygophyllales
Zygophyllaceae
Guaiacum
G. sanctum
ℹ️Name Origins
  • Guaiacum: From Taino language (Caribbean indigenous) - sanctum: Latin for "sacred" or "holy" - Lignum Vitae: Latin "Wood of Life" (medicinal reputation) - Guayacán: Spanish from indigenous name

Related Species

💡Both Species at Risk

Both G. sanctum (Holywood) and G. officinale (Common) are endangered and CITES-listed. They share similar properties and both have been heavily exploited. G. sanctum is the primary species in Costa Rica.


Physical Description

Overall Form

The Guayacán Real is a small to medium-sized evergreen tree with a short, often crooked trunk and a dense, rounded crown. It grows extremely slowly—taking decades to reach modest size—but can live for centuries. The bark is pale and scaly, and the wood within is among the hardest and densest on Earth, with a beautiful greenish-brown heartwood.

Mature Height/100
Crown Spread/100
Trunk Diameter/100
Growth Rate/100

Distinctive Features

Leaves

  • Type: Pinnately compound
  • Leaflets: 3-5 pairs (6-10 total)
  • Size: 2-4 cm per leaflet
  • Shape: Oval, asymmetrical
  • Color: Deep green, glossy
  • Evergreen: Yes

Bark

  • Color: Pale gray to whitish
  • Texture: Thin, scaly
  • Pattern: Mottled, patchy
  • Older Trees: More fissured

The Spectacular Flowers

  • Color: Deep blue to purple
  • Size: 2-3 cm across
  • Petals: 5
  • Timing: Mainly dry season
  • Display: Spectacular mass flowering
  • Pollinators: Bees primarily

Fruits

  • Type: Heart-shaped capsule
  • Size: 1.5-2 cm
  • Color: Yellow-orange when ripe
  • Opening: Splits to reveal seeds
  • Seeds: 1-2, covered in red aril
  • Dispersal: Bird-consumed
✅The Flowers Are Worth Seeing

When a Guayacán Real bursts into bloom, it's unforgettable: - Color: One of the truest blues in the plant kingdom - Display: Entire crown covered in flowers - Duration: Several weeks - Timing: Usually March-May in Costa Rica - Bonus: Flowers fall, carpeting ground in blue Combined with yellow-orange fruits and deep green foliage, a flowering Guayacán Real is stunningly beautiful!


The Extraordinary Wood

Why Lignum Vitae Is Unique

💎

The World's Hardest Commercial Wood

Lignum vitae wood has properties unlike any other: Physical Properties: - Density: 1.1-1.4 g/cm³ (denser than water—sinks!) - Janka Hardness: 4,500 lbf (one of highest known) - Natural oils: 25-30% by weight (guaiac resin) - Self-lubricating: The oils make it naturally slippery Unique Characteristics: - Wood sinks in water immediately - Can be used without additional lubrication - Extremely resistant to abrasion - Practically impervious to rot - Will not crack or split easily The Trade-off: These remarkable properties come from extremely slow growth— it takes 100+ years to produce usable timber, making sustainable harvest nearly impossible.

Historic Uses


Distribution and Habitat

Native Range

🗺️

Geographic Distribution

Distribution in Costa Rica

⚠️Severely Depleted

In Costa Rica, Guayacán Real populations have been: - Heavily logged historically - Restricted to dry forest (naturally limited) - Slow to recover (extremely slow growth) - Focus of conservation programs Seeing wild Guayacán Real in Costa Rica is increasingly rare, though restoration efforts are underway in protected areas.

Habitat Preferences


    Conservation Status

    Why It's Endangered

    ⚠️Critical Conservation Concern

    Guayacán Real faces multiple threats: Historical Exploitation: - Harvested intensively since 1500s - European demand for ship bearings - Medicinal trade (syphilis treatment claims) - Woodworking (density = prestige) Biological Vulnerabilities: - Extremely slow growth (decades to maturity) - Limited habitat (dry forest specialist) - Low seed production - Poor regeneration Current Status: - IUCN: Endangered - CITES: Appendix II (regulated trade)

    • Costa Rica: Protected species - Wild populations fragmented and depleted

    Conservation Efforts


    Ecological Importance

    Wildlife Interactions

    Flower Visitors

    • Bees: Primary pollinators
    • Butterflies: Nectar feeders
    • Various insects: Secondary visitors

    Fruit/Seed Users

    • Birds: Eat fruits, disperse seeds
    • Small mammals: Occasional fruit consumers

    Dry Forest Ecosystem

    ℹ️Dry Forest Specialist

    Guayacán Real is part of the endangered dry forest ecosystem: - Only about 1% of original Central American dry forest remains - Dry forest biodiversity is highly threatened - Many dry forest species are specialists - Guayacán Real adds to dry forest structure Conserving Guayacán Real means conserving dry forest habitat, benefiting many other species simultaneously.


    Traditional Medicine

    The "Wood of Life" Reputation

    ⚠️Medical Disclaimer

    Historical use only. Do not use for medical purposes. Some compounds are potentially harmful.

    ⚕️

    Historic Medicinal Fame

    Lignum vitae gained its "Wood of Life" name from medicinal claims: 16th-19th Century Uses: - Syphilis treatment: Main historic use (before antibiotics) - Gout and rheumatism: Wood and resin decoctions - Respiratory conditions: Traditional applications - Fever reduction: Various preparations The Guaiac Compound: - Resin contains guaiacol - Has genuine antiseptic properties - Used in some modern medical tests - "Guaiac test" for blood detection Modern Assessment: Historic syphilis treatment was ineffective and potentially harmful. The compound guaiacol has limited modern medical use.


    Cultivation

    Growing Guayacán Real


    Identification Guide

    How to Identify Guayacán Real


    Where to See Guayacán Real in Costa Rica

    💡Visiting Tips

    To see Guayacán Real: - Best time: Dry season (flowering) - Where: Santa Rosa NP has the best populations - Guides: Local naturalist guides know locations - Patience: Trees are not abundant Flowering in March-May is the best time—the blue flowers make trees visible from a distance!


    The Bahamas Connection

    🇧🇸

    National Tree of the Bahamas

    Guaiacum officinale (the related species) is the national tree of The Bahamas: - Represents resilience and endurance - Featured on Bahamian coat of arms - Symbol of Caribbean natural heritage - Conservation priority throughout the region Both G. officinale and G. sanctum face similar threats and benefit from regional conservation cooperation.


    External Resources

    🔗
    iNaturalist: Guaiacum sanctum↗

    Community observations and photos

    🔗
    CITES Species Database↗

    International trade regulations

    🔗
    IUCN Red List↗

    Conservation status information


    References

    📚 Scientific References & Further Reading

    IUCN (2020). Guaiacum sanctum. The IUCN Red List of Threatened Species. IUCN Global Species Programme

    Oldfield, S. (1998). Lignum Vitae Trade: Status and Conservation Implications. TRAFFIC International

    Janzen, D.H. (1983). Guaiacum sanctum in Costa Rican Natural History. University of Chicago Press


    ⚠️A Wood Too Valuable for Its Own Good

    The story of Guayacán Real is a cautionary tale about unsustainable exploitation. For 500 years, humans have prized this tree for properties that took millions of years to evolve—density, hardness, and natural lubrication. But those same properties require centuries of slow growth, making sustainable harvest nearly impossible. Today, the remaining wild populations are shadows of their former abundance, protected by international law but still recovering from centuries of cutting. When you see a Guayacán Real in bloom—those impossibly blue flowers against dark green foliage—remember that you're looking at a living lesson about the consequences of taking more than nature can give. Some things cannot be rushed, and some treasures are best left standing.

    Safety Information Disclaimer

    Safety information is provided for educational purposes only. Individual reactions may vary significantly based on age, health status, amount of exposure, and individual sensitivity. Always supervise children around plants. Consult a medical professional or certified arborist for specific concerns. The Costa Rica Tree Atlas is not liable for injuries or damages resulting from interaction with trees described in this guide.

    • Always supervise children around plants

    • Consult medical professional if unsure

    • Seek immediate medical attention if poisoning occurs

    Information compiled from authoritative toxicology sources, scientific literature, and medical case reports.

    Comparison Guides

    Compare with Madero Negro

    Guayacán Real is an endangered slow-growing tree producing the world's densest wood, while Madero Negro is a fast-growing nitrogen-fixing legume used as living fences and coffee shade.

    Read guide

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    Distribution in Costa Rica

    GuanacasteAlajuelaHerediaSan JoséCartagoLimónPuntarenasNicaraguaPanamaPacific OceanCaribbean Sea

    Legend

    Present
    Not recorded

    Elevation

    0-600m

    Regions

    • Guanacaste
    • Puntarenas