Heracleum sosnowskyi

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.

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Heracleum sosnowskyi is 3–5 metres (10–16+1⁄2 ft) in height, with a straight, firm stem that can reach a diameter of 12 centimetres (4+1⁄2 in). The leaves are 50–60 cm (20–24 in) long. The root is very firm, up to 30 cm (12 in) diameter. The inflorescence is a big umbel found at the end of every stem. It blooms from July to September and produces thousands of seeds, which are easily distributed by wind but most commonly by water. As Sosnowsky's hogweed is a monocarpic perennial species, the entire plant (including the root) dies after flowering and producing seed. Inflorescences Similar species Similarly tall invasive species include H. mantegazzianum and H. persicum. Similar, though much smaller, non-invasive species include H. sphondylium in Europe and H. maximum in North America. Additionally, wild parsnip, garden angelica and wild angelica may be similar.

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Early botanists considered H. sosnowskyi to be a subspecies of H. mantegazzianum. Sosnowski's hogweed was described as a separate species by Ida P. Mandenova in 1944. The species is named after the Russian botanist Dmitrii Ivanovich Sosnowsky (1885–1952), who found the species in Georgia in 1936.

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