Is there any Rubber/Latex source that could have been used by Europeans prior to the discovery of the Americas?

I was imagining a scenario where an 21st century engineer accidentally finds himself transported through time to early Renaissance Europe. Realizing that no help or rescue is on the way, he decides to use his knowledge to become an influential businessman. It occurred to me that rubber has many modern uses. Is there any way a usable source could be obtained prior to the discovery of the Americas?

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Is there any Rubber/Latex source that could have been used by Europeans prior to the discovery of the Americas?

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