Around a third of all tree species worldwide are threatened with extinction.
A report published on Wednesday warns that the clearing of forest areas for agriculture and logging threaten the continued existence of many tree species.
Climate change also has “clearly measurable effects”.
According to this, magnolias are among the most endangered species.
Oak and maple trees are also classified as endangered.
The report was presented by an international association of botanical gardens (Botanic Gardens Conservation International) and experts from the World Conservation Union (IUCN).
The IUCN will advise on the protection of animal and plant species at a conference in Marseille in the south of France from Friday.
The study examined the threat situation for 58,497 tree species worldwide and found that 30 percent are threatened with extinction.
Another seven percent are classified as “possibly threatened”.
Insufficient data was available for an assessment for 21 percent of the species.
A little more than 40 percent were classified as “not at risk”.
Tropical regions of Africa are particularly threatened
About 142 tree species have been classified as extinct by the experts, and of more than 440 tree species there are fewer than 50 specimens in the wild.
Brazil, which is home to much of the Amazon rainforest, has the most tree species (8847) - but also the most endangered species (1788), according to the report, due to the intensive agriculture there.
However, the highest proportion of threatened species is found in the tropical regions of Africa, particularly on the islands of Madagascar and Mauritius, where 59 percent and 57 percent of all tree species are endangered, respectively.
In a foreword to the report, Jean-Christophe Vie, General Director of the Swiss Franklinia Foundation, which specializes in nature conservation, described it as "shocking" that the deforestation of large forest areas continues, although trees play an important role in nature as they are the habitat for many animal species. and plant species, absorb CO2 and supply ingredients for medicines.