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adventive (ad-VEN-tiv) - adj., not native to and not fully established in a habitat, temporarily naturalized.
Also used as a noun, a species that is adventive. Originally, a non-indigenous species that has since become fully naturalized, but this has shifted to a more metastable condition, of NOT being naturalized and needing outside reintroduction to keep the population alive. Cultivated plants that only grow where cultivated are adventive, while if they escape those confines they become naturalized. (Note that an adventive need not be introduced by humans.) Adopted from Latin adventīvus, arrival.
---L.
Also used as a noun, a species that is adventive. Originally, a non-indigenous species that has since become fully naturalized, but this has shifted to a more metastable condition, of NOT being naturalized and needing outside reintroduction to keep the population alive. Cultivated plants that only grow where cultivated are adventive, while if they escape those confines they become naturalized. (Note that an adventive need not be introduced by humans.) Adopted from Latin adventīvus, arrival.
---L.
