| Part of Speech | Definition | |
| Noun | 1. Widely distributed genus of plants with usually thick rootstocks and large umbels of white flowers.[Wordnet]. | |
Source: WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. | Top | |
Date "Heracleum" was first used in popular English literature: sometime before 1828. (references) |
Common Expressions: Heracleum
| Expressions | Definition | ||
| Genus Heracleum | Widely distributed genus of plants with usually thick rootstocks and large umbels of white flowers. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved. | ||
| Heracleum sphondylium | Tall coarse plant having thick stems and cluster of white to purple flowers. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved. | ||
Source: compiled by the editor from various references; see credits. | Top | ||
Specialty Expressions: Heracleum
| Expressions | Domain | Definition | |
| Heracleum mantegazzianum | Aerospace | Giant hogweed is naturalized in south central Ontario. It has caused photosensitization in children after exposure to the plant followed by sunlight (Morton 1975). This plant has also been introduced into New York State, where children have also contracted dermatitis from it (Gunby 1980). Giant hogweed contains furocoumarins (psoralens), which make human skin hypersensitive to sunlight, causing cellular damage at the surface. They absorb long-wave ultraviolet light and become photodynamic (Cooper and Johnson 1984). Symptoms of phytophotosensitization include serious and extensive weeping blisters. The lesions often occur in a line where the person has brushed aside the stems. The bullae can be massive and irritating, and brown pigmentation may remain for years after healing (Morton 1975, Gunby 1980). General symptoms of poisoning: 1- Humans: a- blistering; b- erythema; and c- skin, brown pigment of. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
