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| Giant Hogweed ： ウィキペディア英語版 |
Heracleum mantegazzianum
''Heracleum mantegazzianum'', commonly known as giant hogweed,〔(【引用サイトリンク】title=Species Profile- Giant Hogweed (''Heracleum mantegazzianum'') )〕 cartwheel-flower,〔〔〔 giant cow parsnip,〔(【引用サイトリンク】title=Giant Hogweed )〕〔 hogsbane or giant cow parsley,〔(【引用サイトリンク】title=Oregon Department of Agriculture Plant Pest Risk Assessment for Giant Hogweed ''Heracleum mantegazzianum'' )〕 is a plant in the family Apiaceae. In New Zealand, it is also sometimes called wild parsnip,〔 or wild rhubarb.〔 It typically grows to heights of . Superficially, it resembles common hogweed (''Heracleum sphondylium''), ''Heracleum sosnowskyi'', or garden angelica (''Angelica archangelica''). It is phototoxic and considered to be a noxious weed in many jurisdictions. Giant hogweed is native to the Caucasus region and Central Asia. It was introduced to Britain as an ornamental plant in the 19th century, and it has also spread to many other parts of Europe, the United States, and Canada.
The sap of giant hogweed causes phytophotodermatitis in humans, resulting in blisters, long-lasting scars, and if it comes in contact with eyes, blindness. These serious reactions are due to the furocoumarin derivatives in the leaves, roots, stems, flowers, and seeds of the plant.
==Description==
Giant hogweed has a stout, bright green stem that is frequently spotted with dark red and hollow red-spotted leaf stalks that produce sturdy bristles. The stems grow to more than 2 m high.〔Parnell, J. and Curtis, T. 2012. ''Webb's An Irish Flora''. Cork University Press. ISBN 978-185918-4783〕 The hollow stems vary from in diameter, occasionally up to . Each dark red spot on the stem surrounds a hair, and large, coarse white hairs occur at the base of the leaf stalk. The plant has deeply incised compound leaves which grow up to in width.
Giant hogweed is a biennial or monocarpic perennial, the plants dying after they have set seed. It usually flowers in its second year from late spring to midsummer, with numerous white flowers clustered in an umbrella-shaped head that is up to in diameter across its flat top. The plant produces 1,500 to 100,000 flattened, -long, oval, dry seeds that have a broadly rounded base and broad marginal ridges. Tall dead stems may mark its locations during winter.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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