Solution:

• The names of endangered plant species are published in the Red Data Book.
• The Red Data Book is a list of threatened species, maintained by the International Union for Conservation of Nature (IUCN).
• It is the world’s most comprehensive inventory of the global conservation status of biological species. The Red Data Book is used to raise awareness of threatened species and to inform conservation action.
• The Green Data Book is a list of species that are not currently threatened, but are at risk of becoming threatened in the future.
• The Yellow Data Book is a list of species that are rare or have a restricted distribution. The Endangered Species Book is a general term for any publication that lists endangered species.