Epilobium tetragonum
Epilobium tetragonum, commonly known as the square stalked willow herb, is a species of flowering plant in the willowherb family Onagraceae.
| Epilobium tetragonum | |
|---|---|
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| Epilobium tetragonum | |
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| E. tetragonum bush | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Myrtales |
| Family: | Onagraceae |
| Genus: | Epilobium |
| Species: | E. tetragonum |
| Binomial name | |
| Epilobium tetragonum | |
The erect perennial herb typically grows to a height of 0.1 to 1.3 metres (0.3 to 4.3 ft) and can have several stems. It blooms between January and November and produces pink-purple flowers.
The species has become naturalised in the Perth and Peel regions of Western Australia.[1]
Appearance
Overhead view of small E. tetragonum plant
Diagram illustrating tetragonal / square arrangement of leaves
Epilobium tetragonum is characterized by its distinctive square-shaped stem, with leaves evenly spaced in a tetragonal arrangement around the stem, giving the plant a square-like appearance. The leaves are hairless and solid green and have a unique shimmer in direct sunlight.[2]
References
- "Epilobium tetragonum". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- "WIllow herb". herbiguide.com. Retrieved 16 April 2023.
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