hairy willowherb USDA PLANTS Symbol: EPHI
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Epilobium hirsutum L.

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Taxonomic Rank: Magnoliopsida: Myrtales: Onagraceae
Synonym(s): codlins and cream, hairy willow herb

Appearance
Epilobium hirsutum is a semi-aquatic perennial herbaceous plant. The plant is erect, branching, covered with soft hairs and grows up to 6 ft. (1.8 m) tall. E. hirsutum is native to Africa, temperate Asia and Europe.
Foliage
E. hirsutum leaves are opposite, sessile and clasp the stem. Leaf blades are lanceolate-elliptic to narrowly obovate or elliptic 1.6-4.7 in. (4-12 cm) long and 0.12-1.6 in. (0.3-4 cm) wide. Foliage is villous both above and below with a serrulate margin. Leaf tip is acute to acuminate.
Flowers
Solitary flowers are held on stems arising from the upper leaf axils. Stems can be floating or lying on the ground. The flowers are showy with bright pink to dark purple notched petals with white centers.
Fruit
E. hirsutum reproduces by seeds, rhizomes and stolons. Fruits are narrow, pubescent, dehiscent seed pods from 1-3.5 in. (2.5-9 cm) long that contain numerous seeds. Seeds have long white hairs that aid in dispersal by wind.
Ecological Threat
E. hirsutum is an extremely widespread and variable species that spreads aggressively by vegetative growth in sunny open wetland habitats, although it can also invade uplands. It can form monocultures in natural wetlands, crowding out native species.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Infestation;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); Ripe fruit capsules with seeds
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Seed(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources:
Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.