Arizonica

Arboretum and Nursery

Endangered Conifers in the Arizonica Arboretum, 2010

The international standard set up by IUCN (International Union for Conservation of Nature) defines the following categories for threatened taxa:

Extinct (EX)
A taxon is Extinct when there is no reasonable doubt that the last individual has died. A taxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon's life cycle and life form.
Extinct in the Wild (EW)
A taxon is Extinct in the Wild when it is known only to survive in cultivation, in captivity or as a naturalized population (or populations) well outside the past range. A taxon is presumed Extinct in the Wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon's life cycle and life form.
Critically Endangered (CR)
A taxon is Critically Endangered when the best available evidence indicates that it meets any of the criteria A to E for Critically Endangered (see Section V), and it is therefore considered to be facing an extremely high risk of extinction in the wild.
Endangered (EN)
A taxon is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered (see Section V), and it is therefore considered to be facing a very high risk of extinction in the wild.
Vulnerable (VU)
A taxon is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable (see Section V), and it is therefore considered to be facing a high risk of extinction in the wild.
Near Threatened (NT)
A taxon is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.
Least Concern (LC)
A taxon is Least Concern when it has been evaluated against the criteria and does not qualify for Critically Endangered, Endangered, Vulnerable or Near Threatened. Widespread and abundant taxa are included in this category.
Data Deficient (DD)
A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat. Listing of taxa in this category indicates that more information is required and acknowledges the possibility that future research will show that threatened classification is appropriate. It is important to make positive use of whatever data are available. In many cases great care should be exercised in choosing between DD and a threatened status. If the range of a taxon is suspected to be relatively circumscribed, and a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified.
Not Evaluated (NE)
A taxon is Not Evaluated when it is has not yet been evaluated against the criteria.

The numbers in brackets indicate the total number of taxa ranked in the given category.

  • Critically Endangered (21)
    • Abies nebrodensis
    • Cupressus chengiana
    • Cupressus dupreziana
    • Cupressus guadelupensis
    • Juniperus bermudiana
  • Endangered (61)
    • Cupressus abramsiana
    • Cupressus abramsiana f. butanoensis
    • Cupressus sempervirens var. atlantica
    • Juniperus oxycedrus brevifolia
    • Picea koyamai
    • Pinus bungeana
  • Vulnerable (130)
    • Abies chensiensis
    • Abies numidica
    • Abies pinsapo
    • Abies recurvata
    • Araucaria araucana
    • Austrocedrus chilensis
    • Cedrus brevifolia
    • Chamaecyparis lawsoniana
    • Cupressus arizonica montana
    • Cupressus chengiana kansonensis
    • Cupressus gigantea
    • Cupressus stephensonii
    • Cupresus bakeri
    • Cupresus forbesii
    • Cupresus goveniana
    • Cupresus macrocarpa
    • Cupresus pigmaea
    • Juniperus deppeana robusta
    • Picea chihuahuna
    • Picea omorika
    • Picea retroflexa
    • Pinus brutia pityusa
    • Sequioadendron giganteum
  • Near Threatened (90)
    • Abies bracteata
    • Abies cephalonica
    • Abies equi-trojani
    • Abies koreana
    • Abies pinsapo marocana
    • Cedrus libani
    • Cryptomeria japonica
    • Cupressus arizonica nevadensis
    • Cupressus lusitanica benthamii
    • Cupressus torulosa
    • Juniperus convallium
    • Juniperus pingii
    • Picea breweriana
    • Pinus aristata
    • Pinus gerardiana
    • Pinus luchuensis
    • Pinus peuce
    • Pinus radiata
    • Sequioa sempervirens
  • Endangered yuccas
    • Yucca bella
    • Yucca gilbertiana
    • Yucca harrimaniae
    • Yucca nana
    • Yucca neomexicana
    • Yucca sterilis
  • Endangered oaks
    • Quercus aucheri
    • Quercus ilex ssp. ballota
    • Quercus graciliformis
    • Quercus pontica
    • Quercus risophylla
References
IUCN Red List of Threatened Species™ (www.iucnredlist.org)
A. Farjon, World Checklist and Bibliography of Conifers, Kew Publishing, 2nd edition 2001
A. Farjon C.N. Page and the IUCN/SSC Conifer Specialist Group, Conifers, Status Survey and Conservation Action Plan, IUCN, 1999
Red List of Oaks (http://www.bgci.org/ourwork/oaks/)