Table 5. Comparison of floristic similarities at the family, generic and specific levels.

Compared flora	Hainan (196 families, 1283 genera and 3894 species)	Vietnam (235 families, 2023 genera and 10790 species)	Guangxi (209 families, 1652 genera and 7734 species)	Guangdong (197 families, 1413 genera and 5302 species)
	Similarity coefficient (%)*	Similarity coefficient (%)	Similarity coefficient (%)	Similarity coefficient (%)
Similarity coefficients at family level
Hainan	100
Vietnam	100	100
Guangxi	96.9	97.6	100
Guangdong	93.9	99.0	99.0	100
Similarity coefficients at generic level
Hainan	100
Vietnam	89.0	100
Guangxi	83.2	80.4	100
Guangdong	78.3	82.7	91.0	100
Similarity coefficients at specific level
Hainan	100
Vietnam	52.6	100
Guangxi	61.6	35.2	100
Guangdong	55.7	39.3	73.1	100

*Similarity coefficient between A and B = the number of taxa shared by both A and B divided by the lowest number of taxa of A or B, multiplied by 100%