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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| Flower | |
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| Habit | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Myrtales |
| Family: | Onagraceae |
| Genus: | Epilobium |
| Species: | E. tetragonum
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| 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[clarification needed] and produces pink-purple flowers.
The species has become naturalised in the Perth and Peel regions of Western Australia.[1]
Description edit
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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 edit
- ^ "Epilobium tetragonum". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- ^ "WIllow herb". herbiguide.com. Retrieved 16 April 2023.
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