Sosnowsky's hogweed (Heracleum sosnowskyi)

Sosnowsky's hogweed, a reference photo — Photo: Sam Thomas · CC BY 2.0 (licence)

Heracleum sosnowskyi, or Sosnowsky's hogweed, is a monocarpic perennial herbaceous flowering plant in the carrot family, Apiaceae. Its native range includes the central and eastern Caucasus regions and South Caucasus. The native ranges of Heracleum sosnowskyi and H. mantegazzianum, a close relative, overlap. Sosnowsky's hogweed is now a common weed in the Baltic States, Belarus, Poland, Russia, and Ukraine.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

Toxic. Sosnowsky's hogweed; sap causes phototoxic burns Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Heracleum mantegazzianum — toxic
Heracleum dissectum

Classification

Kingdom: Plantae
Phylum: Tracheophyta
Class: Magnoliopsida
Order: Apiales
Family: Apiaceae
Genus: Heracleum
Species: Heracleum sosnowskyi

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