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ultra-tropical
ultra-tropical adj.
Brit. 
/ˌʌltrəˈtrɒpᵻkl/
, /ˌʌltrəˈtrɒpᵻkl/U.S. /ˌəltrəˈtrɑpək(ə)l/
/ˌəltrəˈtrɑpək(ə)l/ΚΠ
1848 E. A. Poe Eureka 83 On the Melville islands..we find traces of ultra-tropical vegetation.
1851 G. F. Richardson Introd. Geol. (1855) 438 Groves and forests of the luxuriant vegetation of an ultra-tropical climate were swept away by floods and inundations.
ultra-tropical
Also ultra-galactic, ultra-tropical. (In dictionaries).extracted from ultra-prefix<
as lemmas