Protected Cupressaceae in North America

It is unlikely that Megastigmus is responsible for any Cupressaceae species being on the threatened or endangered species in North America.  The causes are more likely loss of habitat, introduction of other alien pests or diseases, or climate change.  However, when a species becomes threatened or endangered, native seed insect species or the potential introduction of an alien seed insect can become a critical factor in the survival of the species.  For this reason, we have researched the Protective Status of the Cupressaceae in North America.

In Canada, no Cupressaceae are listed on the Species at Risk Public, however, according to Wild Species ( there are several species that have a less drastic status:

  • Juniperus maritime is listed as having a Sensitive status both at the federal level and in British Columbia
  • Juniperus horizontalis is listed as Sensitive in Nunavut and May Be At Risk in PEI
  • Thuja occidentalis is At Risk in Nova Scotia and Sensitive in PEI
  • Juniperus virginiana is listed as May Be At Risk in Quebec
  • Juniperus scopulorum is listed as May Be At Risk in Saskatchewan
  • Thuja plicata is listed as May Be At Risk in Alberta

There are 16 species of Cupressaceae in the United States that have protected status.  From the federal government, Cupressus abramsiana has endangered status and Cupressus goveniana ssp. goveniana has received a threatened status.  The following species have received some level of protected status from at least one state:

  • Calocedrus decurrens
  • Chamaecyparis thyoides
  • Cupressus arizonica
  • Juniperus californica
  • Juniperus communis
  • Juniperus communis
  • Juniperus occidentalis var. australis
  • Juniperus horizontalis
  • Juniperus occidentalis var. occidentalis
  • Juniperus osteosperma
  • Juniperus scopulorum
  • Taxodium distichum
  • Thuja occidentalis
  • Cupressus abramsiana

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