CR

Cycas tansachana

Declining

Overview

Cycas tansachana is a species of cycad in Thailand. They are located to the northeast of Khong Khi Sua in Kaeng Khoi District, Saraburi Province, central Thailand. It is also found in Praphotisat Cave Temple Huai Haeng (ห้วยแห้ง) Subdistrict, Kaeng Khoi District. It is locally abundant, but has a highly restricted distribution.

Cycas tansachana faces severe population decline due to overcollection for horticultural trade, as cycads are highly prized ornamental plants. Habitat destruction from agricultural expansion and urban development in its limited range has further reduced available growing sites. The species' extremely slow growth rate and reproductive cycle make recovery from population losses exceptionally difficult, with individual plants taking decades to reach maturity.

Threat summary

Habitat

This cycad species inhabits tropical limestone karst formations and rocky outcrops in northern Vietnam. It grows in well-drained soils among limestone cliffs and forest margins, typically in areas with high humidity and partial shade.

Forest· majorForest - Subtropical/tropical dry· majorRocky areas· major

Conservation measures underway

Site/area protectionSpecies recoveryAwareness & communicationsLegislation

Other threatened species in CYCADACEAE

Cycas siamensisVU

Cycas siamensis

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VU

Cycas nathorstii

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EN

Cycas elephantipes

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Cycas nongnoochiae

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Threatened in Thailand

Acropora hemprichiiEN

Acropora hemprichii

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Montipora calcarea

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EN

Wrinkled Hornbill

Rhabdotorrhinus corrugatus

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Mitrephora vulpina

Unknown

Frequently asked questions

Why is Cycas tansachana classified as Critically Endangered?
Cycas tansachana is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Cycas tansachana faces severe population decline due to overcollection for horticultural trade, as cycads are highly prized ornamental plants. Habitat destruction from agricultural expansion and urban development in its limited range has further reduced available growing sites. The species' extremely slow growth rate and reproductive cycle make recovery from population losses exceptionally difficult, with individual plants taking decades to reach maturity.
Where does Cycas tansachana live?
Cycas tansachana occurs in Thailand. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Cycas tansachana?
The main threats to Cycas tansachana are 3.2, ai-1, ai-2, and ai-3. The full IUCN-classified threat record for this species is detailed on the species page.

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