BugwoodWiki Article

hairy willowherb
Epilobium hirsutum L.

Overview

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.

Resources

Selected Images


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hairy willowherb
Epilobium hirsutum
Plant(s)
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Infestation
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Flower(s)
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Foliage
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Flower(s)
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Flower(s)
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Fruit(s)
Leslie J. Mehrhoff
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hairy willowherb
Epilobium hirsutum
Seed(s)
Leslie J. Mehrhoff

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Rosidae
Order: Myrtales
Family: Onagraceae
Genus: Epilobium

Other System Links

Plants: EPHI
Bayer: EPIHI
GRIN: 417511
ITIS: 27305
NPDN Pest: PDNABBB

Synonyms and Other Names

Other Common Names:
codlins and cream, hairy willow herb

Categories

Category: Forbs/Herbs