Glacial relict
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A glacial relict is a population of a species that was common in the Northern Hemisphere prior to the onset of glaciation in the late Tertiary that was forced by climate change to retreat into refugia
The Franklin tree is an example of a glacial relict species from the Southeastern USA. It went extinct in the wild in the early 19th century due to a changing climate, inability to spread outside of its limited range, and limited environmental tolerance. The species survives today as a cultivated garden plant.
Picea critchfieldii
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Picea critchfieldii is an extinct species of spruce tree formerly present on the landscape of North America, where it was once widely distributed throughout the southeastern United States. Plant macro
Glacial relict
…plants in the Southeastern USA which were limited by the same environmental factors include the Florida torreya, the Florida yew, and the now-extinct Critchfield spruce. Biodiversity hotspot…
Extant Picea glauca, to which P. critchfieldii were formerly attributed