Ontologia
Cycas siamensis

Cycas siamensis

Miq.

VULR Monde (IUCN)
  1. Plante
  2. Tracheophyta
  3. Cycadopsida
  4. Cycadales
  5. Cycadaceae
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Pays · région · aire protégée · écorégion · biome

Graphe en cours d’indexation

Calcul du tissu écologique de Cycas siamensis.

Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).

Liste rouge IUCN

VU · Vulnérablecritères A2cd+4cd↘Décroissante
Évaluation complète
Évaluation
2023 · v3.1
Altitude
– 300 m
Profondeur
– m
État de la populationExpert
This species is widespread and locally abundant but the population is estimated to have declined by more than 30% over the past 120 years (three generations) due to habitat loss and collecting of plants for the ornamental plant trade.

Menaces identifiées(3 menaces classées CMP-IUCN)

  • 2_1_2
    Small-holder farming
    Ongoing
  • 5_2_1
    Intentional use (species is the target)
    Ongoing
  • 7_1_3
    Trend Unknown/Unrecorded
    Ongoing
Description complète des menacesExpert
This species has been over-collected to be sold as ornamentals, and its habitat is continually being reduced. A large portion of the habitat of Cycas siamensis has been cleared for coffee and rubber plantations, and too frequent fires are also having an effect on the habitat.

Habitats préférentiels (classification IUCN)

  • 1_5Forest - Subtropical/Tropical Dry
  • 4_5Grassland - Subtropical/Tropical Dry
  • 6Rocky areas (eg. inland cliffs, mountain peaks)
Mesures de conservation recommandéesExpert
Cycas siamensis is listed in Appendix II of the CITES Appendices. Subpopulations of this species are protected in the Yok Don National Park in Viet Nam. An education and awareness programme as well as the long-term monitoring of subpopulations will support the conservation of this species.
Actions de conservation (2)Expert
  • 1_1Site/area protection
  • 4_3Awareness & communications
Stress écologiques (5)Expert
  • 1_1Ecosystem conversion
  • 1_2Ecosystem degradation
  • 1_2Ecosystem degradation
  • 2_1Species mortality
  • 2_3_8Other
Usage & commerce (1)Expert
  • 13Pets/display animals, horticulture
    internationalnationalsubsistance
Priorités de recherche (1)Expert
  • 1_2Population size, distribution & trends
Niche IUCN globaleExpert

Royaumes biogéographiques

Indomalayan

Systèmes (terrestre/eau douce/marin)

Terrestrial

Formes de croissance

CycadShrub - large
Références bibliographiques (8)Expert
  1. IUCN. 2023. The IUCN Red List of Threatened Species. Version 2023-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 07 December 2023).
  2. Missouri Botanical Garden. 2015. Tropicos.org. Available at: <a href="http://www.tropicos.org/Name/9600168">http://www.tropicos.org/Name/9600168</a>. (Accessed: 12 Feb 2015 ).
  3. Averyanov, L.V., Nguyen, T.H., Sinh, K.N., Pham, T.V., Lamxay, V., Bounphanmy, S., Lorphengsy, S., Phan, L.K., Lanorsavanh, S. and Chantthavongsa, K. 2014. Gymnosperms of Laos. <i>Nordic Journal of Botany</i> 32(6): 765-805. doi: 10.1111/njb.00498.
  4. Hill K.D., Nguyen, H.T. and Loc, P.K. 2004. The Genus <i>Cycas</i> (Cycadaceae) in Vietnam. <i>The Botanical review</i> 70(2): 134-193.
  5. Whitelock, L.M. 2002. <i>The Cycads</i>. Timber Press, Portland, Oregon.
  6. Hill, K.D. and Yang, S.-L. 1999. The genus <i>Cycas</i> (Cycadaceae) in Thailand. <i>Brittonia</i> 51(1): 48-73.
  7. Hill, K.D. and Stevenson, D.W. 1998 - 2006. The Cycad Pages. Available at: <a href="http://plantnet.rbgsyd.nsw.gov.au/PlantNet/cycad/index.html">http://plantnet.rbgsyd.nsw.gov.au/PlantNet/cycad/index.html</a>.
  8. Tang, W. and Yang, S.-L. 1995. Focus on <i>Cycas siamensis</i>. <i>Encephalartos</i> 43: 4-11.
Évaluateurs & contributeurs (3)Expert
assessor
Bösenberg, J.D.
contributor
Nguyen, T.H.
evaluator
Donaldson, J.S.

Bösenberg, J.D. 2023. Cycas siamensis. The IUCN Red List of Threatened Species 2023: e.T42066A69157502. Accessed on 05 May 2026.

Répartition mondiale (heatmap GBIF)Construction en cours

0 obs · 0 cellules
Construction par partitions temporelles GBIF0%

Source : GBIF — observations agrégées par hexagones 0.2° × 0.2° (~22km). Filtre qualité : précision coordonnée < 10 km. Coloration quantile (q50/70/90/99). Fond carte : OpenFreeMap · © OpenStreetMap.

Distribution mondiale

Calcul de la distribution GBIF· ~10–60 s

Phénologie

Calcul du calendrier d'apparition· ~5–30 s

Consulter sur les bases externes

Observations & statuts

GBIFiNaturalistEOLIUCN

Cartographie

GBIF Maps

Bibliographie

BHLOpenAlex
Note nomenclaturale & synonymesExpert

Note nomenclaturale

TAXREF v18 — INPN/MNHN

Synonymes (7)— redirigent vers cette page

  • Cycas aureaJ.Schust.
  • Cycas boddamiiVan Geert
  • Cycas cochinchinensisWarb. ex J.Schust.
  • Cycas immersaCraib
  • Cycas intermediahort. ex B.S.Williams
  • Cycas siamensis subsp. siamensis
  • Epicycas siamensis(Miq.) de Laub.

Sources : Catalogue of Life Cross-References (synonymes) · TAXREF v18 INPN/MNHN (commentaires FR).