Neoendemism

Charles Darwin wrote:...one might really fancy that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends.

[3] The Santa Cruz cypress (Hesperocyparis abramsiana; formerly classified as Cupressus abramsiana) has a geographic range limited to a small section in the Monterey Bay region of California where subsea canyon topography reliably produces summer fog, owing to cold water upwelling.

Fish and Wildlife Service listed the species as endangered in 1987, due to increasing threats from habitat loss and disruption of natural forest fire regimes.

[5] However, a lengthy section of the 2016 federal report titled "Genetic introgression" (also known as introgressive hybridization) explains how the integrity of this species is also threatened by nearby horticultural plantings of a sister species, Monterey cypress, whose historically native range is nearby: on the opposite side of Monterey Bay.

As well, it illustrates an element of ongoing human impact — wind-dispersed pollen contamination from horticultural plantings — that cannot easily be corrected to meet conservation goals.