Of the total number of species found globally, Nepal possesses 2.80 percent plants. Record from 2006 shows that Nepal has 6,391 flowering plant species, representing 1,590 genera and 231 families. Nepal’s share of flowering plant species is 2.76 percent of the global total compared to earlier records of 2.36 percent. Nepal’s share of pteridophytes is 5.15 percent compared to earlier records of 4.45 percent.
There are 2,532 species of vascular plants represented by 1,034 genera and 199 families in the protected sites. Some 130 endemic species are found in the protected sites.
For ecology and vegetation purpose Nepal could be divided into four floristic regions i.e.
(c) central, and
(d) Eastern and bio-climatically these are broken down into twenty regions from humid tropical climate to the arid, alpine regions.
There are 399 endemic flowering plants in Nepal of which about 63 percent are from the high mountains, 38 percent from the mid-hills, and only 5 percent from the Terai and Siwaliks. Similarly, the central region contains 66 percent of the total endemic species followed by 32 percent in the western and 29 percent in the eastern regions.