Chamaenerion angustifolium

Unité de Malherbologie & Agronomie
Weed Science & Agronomy
INRA-Dijon

Bayer Code : chaan

Synonym(s) of Sc. name: Epilobium angustifoliu

Classification: Onagraceae, Dicotyledonous

Common name: rosebay willowherb

Synonym(s) of Common name:fireweed

Name per country: DE : Wald-Weidenröschen ; FR : epilobe à feuilles étroites ; IT : garofanino maggiore ; PT : ; EN : rosebay willowherb ;

Biological type: Perennial with rhizomes

Seedling:

- Cotyledons rhomboid, short, broad.

- Foliage leaves : first ones slender-ovate, later lanceolate.

Adult plant:

- Height up to over 100 cm, rhizomes.

- Stem usually little branched.

- Foliage leaves lanceolate (25-200 x 4-35 mm), sessile with rounded base.

- Flowers large, about 15 mm, in terminal, multiflorous raceme, rose purple (rarely whitish).

- Fruit narrow and long, reddish, dehiscent, striking because of the numerous white seedhairs.

- Biological type: perennial

- Spread: rare in cultivated areas in Great-Britain.

Ecological profile (click on flags): Rare