Floristic characteristics of the rare and endangered plants and the conservation countermeasures in Tibet, China

The floristic elements and the geographical distribution are analyzed in this paper based on statistics of elements of rare and endangered plants in Tibet. The results have been gained as following: ① According to “the National Important Wild Conservative Plants List (List 1)” and “the National Important Wild Conservative Plants List (List 1)”, there are a total of 54 plant species (48 genera and 33 families); ② The geographical elements are very complicated in Tibet with 12 of 15 distribution patterns of geenra classified by academician Wu; ③ There are obvious temperate genera with 28 genera accounting for 60.4% of the total genera: ④ There are abundant endemic species accounting for 18.52% of total species but poor endemic genera; ⑤ The geographical distribution is uneven and a great of species distribute in the areas between 1 000 m and 3 500 m above sea level; ⑥ To protect the rare and endangered plants efficiently, six conservation measures are proposed, and 35 species are suggested for the conservative plants of the autonomous conservation level.