Abies beshanzuensis

Abies beshanzuensis, known as Baishanzu fir, is a critically endangered coniferous tree in the family Pinaceae, order Pinales, endemic to a single mountain peak in Zhejiang Province, southeastern China. It is considered one of the rarest trees in the world, with the wild population reduced to fewer than five adult trees growing on the summit and upper slopes of Mount Baishanzu, from which its name derives, at elevations of approximately 1,700 to 1,800 metres. This extreme rarity places it among the most threatened plant species on Earth, and it is listed as Critically Endangered on the IUCN Red List. Morphologically, Abies beshanzuensis is a medium-sized fir tree with flat, dark green needles displaying the typical bi-coloured underside of two white stomatal bands characteristic of the genus. The bark is grey and smooth in young trees, becoming rougher with age. Seed cones are erect and cylindrical, held on the upper branches, disintegrating at maturity to release winged seeds. The decline of this species is attributed to historical deforestation, climate change causing upward shifts in its already summit-restricted habitat, disease, and poor natural regeneration. Intensive conservation efforts by Chinese authorities and botanical institutions have included ex-situ propagation, reforestation trials, and the establishment of strict protection zones on Mount Baishanzu. Its survival represents a significant challenge in conservation biology and a test of the effectiveness of rescue breeding programs for critically endangered gymnosperms.