The flora of Northern Europe has many similarities to that of eastern North America and high elevation plants in the Alps have close relatives in the Rocky Mountains, so I knew many of the plants. Sort of. Because, apart from widespread weeds, North America's plants are only related to Europe's, not identical.
Where I actually knew the plants, they were European natives that are now weeds in North America.
Of course the dandelion, Taraxacum officinale (sunflower family, Asteraceae) - a source of food and medicine across the Europe in the 17th century, so it brought to North America intentionally, then we stopped using it and it got away.
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| dandelions in Switzerland |