New records in vascular plants alien to Tenerife (Spain, Canary Islands).

Background: Recent fieldwork by the author in Tenerife, mostly between 2014 and 2019, yielded new records of alien vascular plants.

New Information: Fifteen taxa (, , , , Eucalyptus camaldulensis subsp. arida, , , , , , , Populus × canadensis, , and ) are reported for the first time from the Canary Islands. All were initially introduced on purpose, mostly as ornamentals, and recently started to escape from cultivation. Most of them are ephemerals or only locally established, but nearly all have the potential to naturalise in the future. Thirteen additional species are reported for the first time from Tenerife: , , , , , , , , , , , and . Finally, some miscellaneous notes are provided on the presence of , , and in Tenerife.