Floristic zones Area (km2) (%) Species richness Mean species richness (per grid) (± S.E.)
Zone I (Cold floristic zone in central high elevation areas)
12,419 (12.3)
1,700
464.7 ± 9.9
Zone II (Cool floristic zone in central and southern high elevation areas)
11,619 (11.5)
1,668
331.7 ± 11.5
Zone III (Warm floristic zone in central and southern hilly areas)
72,367 (72.0)
2,379
79.3 ± 3.4
Zone IV (Maritime floristic zone near the coast and islands)
4,265 (4.2)
2,200
298.6 ± 14.0
Total 100,378 (100.0) 2,954 162.6 ± 5.8