On status of Heracleum sosnowskyi Manden. on the territory of Russian Federation

The secondary area of an invasive Heracleum sosnowskyi Manden did not reach the ecological limit now. A factor constraining further distribution of this species, which is adventive for overwhelming majority of regional florae in the Russian Federation, could become raising its status as a quarantine object. Preliminary estimation of potential danger of this species gives all grounds to refer Heracleum sosnowskyi to the category of quarantine weed plants on territory of many regions, where it is not so widespread yet, as in the Midle band of the European part of Russia.