Tectona grandis
Enable an agent to identify Tectona grandis, assess the condition and growing context of its trees, and evaluate propagation, care and harvest decisions against recorded evidence.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to identify Tectona grandis, assess the condition and growing context of its trees, and evaluate propagation, care and harvest decisions against recorded evidence.
Tectona grandis is a large deciduous tree species in the mint family, Lamiaceae, native to parts of South and Southeast Asia and widely cultivated for teak, its durable heartwood.
It can be Compare a tree or voucher with diagnostic references and flag uncertain identification.; Trace a seedling, seed lot or clone to its biological source.; Evaluate planting suitability using site observations and locally applicable teak evidence.; Schedule reproductive observations and evaluate documented propagation trials.; Compare repeated crown and growth observations to decide whether further diagnosis or care is warranted.; Link a harvest assessment to the source tree and transfer material properties to a separate timber model..
Distinguishing features
Resolve an identification to the accepted name Tectona grandis L.f., in Lamiaceae; a common or commercial name alone is insufficient. [Kew POWO](https://powo.science.kew.org/taxon/864923-1)
Check the combination of opposite, simple, broadly elliptic to ovate leaves and hairy undersides bearing reddish glandular dots; use the combination as supporting evidence rather than a unique species test. [NParks](https://www.nparks.gov.sg/FloraFaunaWeb/Flora/3/1/3178)
When reproductive material is available, compare terminal branching clusters of small pale flowers and hairy drupes with an authoritative botanical description. [NParks](https://www.nparks.gov.sg/FloraFaunaWeb/Flora/3/1/3178)
For a specimen identified only as teak, require a botanical determination or appropriate material authentication before accepting it as Tectona grandis; keep unresolved congeners and trade-name identifications provisional.
Scope
+ Taxonomic identity and evidence distinguishing Tectona grandis from other trees called teak
+ Diagnostic vegetative and reproductive features
+ Geographic origin, planting provenance and local establishment
+ Growth, seasonal development and reproductive condition
+ Propagation material, regeneration and establishment outcomes
+ Tree health, management responses and links to harvested material
- Other Tectona species and unrelated trees marketed as teak
- Teak lumber grading, processing and finished products
- Plantation enterprises, land ownership and forest certification systems
- Whole forest ecosystems and landscape carbon accounting
- Pest organisms and diseases as independently modelled biological entities
- Medicinal preparations and clinical efficacy claims
Characteristics
- Identification confidence
- unverified | provisional | verified | disputed; record evidence and determiner Prevents a teak label from becoming an unsupported species identification.
- Diagnostic leaf observations
- arrangement, blade shape, underside hairs and glandular dots; include absent or unobservable Makes identification evidence inspectable when flowers or fruits are unavailable.
- Biological provenance
- source population, mother tree, seed lot or clone linked to collection records Separates inherited origin from nursery address and current planting location.
- Local establishment status
- native occurrence | planted | naturally recruited after introduction | unresolved Distinguishes geographic occurrence from evidence of native origin or independent regeneration.
- Stem diameter
- cm; record measurement height, date and treatment of irregular stems Supports repeatable growth assessment without assuming diameter proves age or timber quality.
- Tree height
- m; record method, date and uncertainty Helps assess establishment and growth alongside provenance and site conditions.
- Seasonal crown condition
- leafless | flushing | fully leafed | senescing | mixed; dated observations Supports interpretation of leaf loss in this deciduous species. [NParks](https://www.nparks.gov.sg/FloraFaunaWeb/Flora/3/1/3178)
- Reproductive condition
- no reproduction observed | flowering | immature fruit | mature fruit | mixed Guides collection timing and interpretation of regeneration evidence.
- Germination outcome
- % with denominator specified as fruits or extracted seeds; record treatment and observation period Keeps propagation trials comparable when planting units and counting methods differ.
- Root-zone conditions
- soil pH, rooting depth in cm and waterlogging duration in days, with methods Provides evidence for explaining performance and selecting locally justified interventions.
- Crown damage
- % affected foliage or crown; distinguish eaten, discoloured, dead and missing tissue Separates observed damage from an unconfirmed pest, disease or seasonal explanation.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 17 findings · 30 questions.
Teak identity Establish which biological entity a teak observation represents.
The scientific species, a common name and a commercial timber label require different identification evidence.
Taxonomic resolution
Anchor identifications to an explicit botanical species concept.
Accepted species anchor
Tectona grandis L.f. is accepted by Kew; retain the authority and reference used for each determination. [Kew POWO](https://powo.science.kew.org/taxon/864923-1)
- Which botanical reference and identifier anchor this determination to Tectona grandis L.f.? definition
- Does the supplied name identify this species, another Tectona species or only a commercial teak label? boundary
Specimen recognition
Make the physical basis of identification available for review.
Diagnostic evidence set
Retain leaf, twig and reproductive observations together with photographs or vouchers; incomplete material should retain its identification uncertainty.
- Which leaf and reproductive characters were actually observed, and which were unavailable? measurement
- Which regional key, voucher comparison or specialist determination excludes the nearest plausible alternatives? provenance
Origin and growing site Connect the tree's biological origin to its present environment.
A widely planted timber species needs explicit separation of native distribution, planting history and local performance.
Geographic and genetic origin
Distinguish where teak occurs from where its planting material originated.
Occurrence versus provenance
Kew records a native range from India to Indo-China and introductions elsewhere; determine local status separately from seed or clone origin. [Kew POWO](https://powo.science.kew.org/taxon/864923-1)
- What dated evidence classifies this occurrence as native, planted or recruited following introduction? provenance
- Can its source population, mother tree or clone be traced independently of its current location? provenance
Teak site response
Assess environmental conditions against evidence relevant to the planting material.
Site suitability evidence
Record seasonal water availability, drainage, soil and light conditions without asserting a universal teak suitability threshold.
- What are the site's dry-season duration, waterlogging history, soil pH, rooting depth and canopy exposure? measurement
- Which local trials or comparable plantings justify establishing or retaining this provenance here? action
Growth and seasonal state Interpret tree dimensions, crown changes and reproduction through time.
Teak assessment must distinguish seasonal leaf change from damage and measured growth from assumed age or harvest readiness.
Stem development
Track growth and form with consistent measurement methods.
Growth and form record
Relate repeated height and diameter measurements to establishment date, stem origin and branching history.
- What height, diameter and clear-stem length were measured, using which reference points and methods? measurement
- Is age supported by planting records, and does the measured stem originate from a seedling, clone or regrowth? provenance
Leaf and reproductive calendar
Build a local seasonal record for the observed trees.
Phenology baseline
Record leaf fall, flushing, flowering and fruit maturation against weather and neighbouring teak observations.
- On which dates were leaf fall, flushing, flowering and mature fruit observed at this site? measurement
- Does the observed leaf loss match the local seasonal baseline, or warrant investigation for stress or damage? action
Propagation and regeneration Evaluate reproductive material and the establishment of new teak trees.
Propagation outcomes depend on traceable material, explicit counting units and observation beyond initial germination.
Propagule identity and treatment
Specify what was collected, treated and planted.
Fruit, seed and clone accounting
Distinguish whole fruits from extracted seeds and vegetative material; preserve lot identity through storage and treatment.
- Does the lot contain whole fruits, extracted seeds, cuttings or another documented propagation unit? definition
- Which mother trees or clones supplied it, and what collection, storage and pretreatment history is recorded? provenance
- What viability or emergence result was obtained, with what denominator and observation period? measurement
Seedling establishment
Follow nursery plants and naturally recruited seedlings into sustained survival.
Establishment and recruitment outcomes
Separate nursery emergence, outplanting survival and independent recruitment around existing teak trees.
- What proportion survived nursery transfer and the first local dry season, and what losses were observed? measurement
- Are unplanted seedlings surviving beyond the planting area, and what evidence supports monitoring, retention or removal? action
Health and management decisions Connect teak condition to justified interventions and harvest assessments.
Crown condition and stem quality inform different decisions; neither species identity nor timber reputation establishes an individual tree's condition.
Damage and diagnosis
Separate teak damage observations from causal diagnoses.
Crown and stem damage evidence
Record foliage feeding, dieback, wounds and decay with dates and specimen evidence where available.
- How much crown or stem tissue is affected, and how has the damage changed between observations? measurement
- What evidence distinguishes seasonal leaf loss, water stress, insect feeding and disease in this tree? boundary
- Which confirmed diagnosis or locally supported threshold justifies treatment rather than continued observation? action
Silviculture and material handoff
Record the basis of tree interventions and maintain identity when material leaves the tree.
Intervention and harvest basis
Assess pruning, thinning, retention or harvest against the stated objective, tree evidence and applicable permissions; link resulting logs to a separate material record.
- What measured stem form, crown competition, defects and management objective support the proposed intervention? action
- Which permission records apply to this tree and proposed operation? provenance
- Where does the living-tree assessment end and separate verification of log identity, heartwood and timber grade begin? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This description covers the tree species, not every wood sold under a common name containing 'teak'.
- Height and wood-density ranges are approximate; verify them against provenance, age and measurement conditions.
- Older references may place the species in Verbenaceae rather than Lamiaceae.
- Which of these check these first hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Botanical nomenclature under the International Code of Nomenclature for algae, fungi, and plants - Tectona grandis L.f. - The scientific name identifies the species; L.f. is the botanical author abbreviation.
- Which of these identifiers and schemes hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Plantation forestry for commercial timber production.
- Outdoor furniture and joinery made from its durable heartwood.
- Boat decking and other marine woodwork.
- Flooring, decorative veneer and interior furnishings.
- Which of these real-world use hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Mature tree height - 20-40 - m
- Wood density at approximately 12% moisture content - 600-750 - kg/m³
- Which of these typical measurements hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Insect defoliation can reduce growth and timber production.
- Prolonged waterlogging can impair root health and survival.
- Frost can damage this tropical species.
- Wood dust generated during processing can irritate the skin and respiratory tract.
- Sapwood lacks the natural durability associated with teak heartwood.
- Which of these failure modes and hazards hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- The native range includes India, Myanmar, Thailand and Laos; cultivation extends widely across the tropics.
- Plantations in Africa and tropical America grow the same species outside its native range.
- Growth rate and timber properties vary with provenance, site conditions, tree age and plantation management.
- Which of these regional variation hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Teak timber - Timber is material harvested from the tree; Tectona grandis identifies the living species.
- Tectona - Tectona is the genus; Tectona grandis is one species within it.
- Iroko - Iroko is timber from Milicia species, sometimes marketed as African teak, and is botanically distinct.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of Tectona grandis this model covers, and on what evidence? provenance
What the second pass must settle
- Which regional botanical keys and verified specimens provide reliable separation from other Tectona species when reproductive material is absent?
- Which provenance-specific field studies establish useful limits for drought, waterlogging, soil conditions and growth at the intended site?
- Which propagation protocols have reproducible outcomes when whole-fruit, seed and seedling counting methods are reconciled?
- Which locally documented pests and diseases require distinct diagnostic evidence and intervention thresholds for teak?
- What current evidence establishes local conservation significance, natural regeneration after introduction and restrictions relevant to planting or harvest?