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Wigandia caracasana
The Caracus wigandia, ''Wigandia caracasana'' is a species of ornamental plant. It is an evergreen that grows to a height of up to 3 metres (10 ft). It has purple flowers in large clusters from spring to autumn. Some sources treat it as a variety of the species ''Wigandia urens''. Native to Central America, it is thought to be naturalized in southern California as a garden escape. It is commonly grown in gardens, and thrives best in a mixture of loam and peat. Cuttings in sand will strike if placed under glass and in heat.
The caracus wigandia can cause severe contact dermatitis.〔(Anderson, P., & Ayres, S. (1931) ). Dermatitis venenata due to Wigandia caracasana: A hitherto unrecognized cause. ''California and Western Medicine, 34'', 278-279〕 A substance that it secretes, 2,3-dimethoxy-geranyl- 1,4-benzoquinone (consisting of a quinonoid ring with a 10 or 11 carbon-membered side chain) is a remarkably strong sensitizer, which is found nowhere else in the plant kingdom. It has been described as approximating an "ideal allergen".〔Hausen, B. M., Heitsch, H., Borrmann, B., Koch, D., Rathmann, R., Richter, B., & Konig, W. A. (1995). Structure-activity-relationships in allergic contact-dermatitis: 1. Studies on the influence of side-chain length with derivatives of primin. ''Contact Dermatitis, 33'', 12-16.〕
==References==
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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