adj. subtropical, bordering on the tropics; pertaining to a region intermediate between tropical and temperate; north of the tropic of Cancer or south of the tropic of Capricorn

adj. semitropical, subtropical, pertaining to regions located immediately north or south of the tropical zone

(adj.) = subtropical.
Ex: Whether such variation occurs in a subtropical area such as Australasia is not clear.
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* país subtropical = subtropical country.
* planta subtropical = subtropical plant.