Both Giant hogweed (Heracleum mantegazzianum) and Sosnowsky's hogweed (Heracleum sosnowskyi) are flowering plants

in the family Apiaceae (Heracleum is a genus of about 60 species there).

Both mentioned above are serious alien invasive weeds in many areas of Europe.

There is also Persian hogweed (Heracleum persicum), similar in size and properties to the Giant hogweed (very common now in northern Norway, where is known as the Tromsø palm).

Are there any (apart of genetics) apparent differences in their morphology allowing to distinguish them?

Are there any significant differences in their biology and ecology?