Cycas hoabinhensis
P.K.Lôc & T.H.Nguyên
Pays · région · aire protégée · écorégion · biome
Graphe en cours d’indexation
Calcul du tissu écologique de Cycas hoabinhensis.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).
Liste rouge IUCN
EN · En dangercritères A2acd+4acd; B1ab(ii,iii,v)+2ab(ii,iii,v)↘Décroissante- Évaluation
- 2023 · v3.1
- Altitude
- 70 – 250 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
Although Cycas hoabinhensis can be locally common relative to other cycads, the estimated overall population size is only 2,500 to 10,000 mature individuals. Studies of all known subpopulations shows that the average percentage of adult plants has been reduced by 54% during the last 30 years (one generation). The decline is expected to continue into the future but likely to a lesser extent due to protection in three nature reserves.
Menaces identifiées(3 menaces classées CMP-IUCN)
3_2Mining & quarryingUnknownUnknownOngoing5_2_1Intentional use (species is the target)Slow, Significant DeclinesMajority (50-90%)Ongoing5_3_3Unintentional effects: (subsistence/small scale) [harvest]Slow, Significant DeclinesMajority (50-90%)Ongoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
Over-collection of plants from the wild has placed this plant at risk. The low regeneration and progressive decrease of the number of mature individuals in all natural subpopulations is caused in part by commercial collecting supported by market demands and in part by habitat loss.
It is a small species that is very popular as a 'bonsai' plant and a large number of plants are being removed from the wild. All subpopulations are isolated from one another by vast plains, non-limestone mountain ridges and well-developed river systems. Within its distribution range the species also meets a serious decline of the quality of its habitat and the number of mature individuals caused by excavations of lime and forest over-exploitation.
It is a small species that is very popular as a 'bonsai' plant and a large number of plants are being removed from the wild. All subpopulations are isolated from one another by vast plains, non-limestone mountain ridges and well-developed river systems. Within its distribution range the species also meets a serious decline of the quality of its habitat and the number of mature individuals caused by excavations of lime and forest over-exploitation.
Habitats préférentiels (classification IUCN)
1_6Forest - Subtropical/Tropical Moist Lowland6Rocky areas (eg. inland cliffs, mountain peaks)
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
This species is listed in Appendix II of the CITES Appendices. Plants are protected in the Cuc Phuong National Park in Ninh Binh province, the Chua Huong Tich Nature Reserve in Ha Tay province and the Thuong Tien Nature Reserve in Hoa Binh province. An education and awareness programme will support the conservation of this species.
Actions de conservation (1)Conservation Actions Classification Scheme — IUCNExpert
4_3Awareness & communications
Stress écologiques (3)Stresses Classification — IUCNExpert
1_1Ecosystem conversion2_1Species mortality2_1Species mortality
Usage & commerce (1)Use & Trade — IUCNExpert
13Pets/display animals, horticultureinternationalnational
Priorités de recherche (1)Research Needed Classification — IUCNExpert
1_2Population size, distribution & trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Indomalayan
Systèmes (terrestre/eau douce/marin)
Terrestrial
Formes de croissance
CycadShrub - small
Références bibliographiques (8)Sources scientifiques de l'évaluation IUCNExpert
- 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).
- Nguyen, K.S., Zhang, D., Nguyen, H.T., Stevenson, D.W. and Averyanov, L.V. 2015. <i>Cycas hoabinhensis</i>, an endangered stenoendemic of Vietnam. <i>Wulfenia</i> 22: 1-19.
- Osborne, R., Hill, K.D., Nguyen, H.T. and Phan Ke, L. 2007. <i>Cycads of Vietnam</i>. R. Osborne and W. van Eeden, Brisbane.
- Osborne, R., Hill, K.D., Nguyen, H.T and Loc, P.K. 2006. Focus on <i>Cycas hoabinhensis</i>. <i>Encephalartos</i> 87: 9-13.
- 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.
- Donaldson, J.S. (ed.). 2003. <i>Cycads. Status Survey and Conservation Action Plan</i>. IUCN/SSC Cycad Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.
- Whitelock, L.M. 2002. <i>The Cycads</i>. Timber Press, Portland, Oregon.
- Jones, D.L. 2002. <i>Cycads of the World</i>. Smithsonian Institution Press, Washington, DC.
Évaluateurs & contributeurs (3)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
Nguyen, T.H.
contributor
Nguyen, K., Zhang, D., Stevenson, D. & Averyanov, L.
evaluator
Bösenberg, J.D.
Nguyen, T.H. 2023. Cycas hoabinhensis. The IUCN Red List of Threatened Species 2023: e.T42047A68902426. Accessed on 05 May 2026.
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
Cartographie