Epilobium parviflorum
Schreb.
Common Name:
Smallflower hairy willowherb
Synonyms and Other Names:
Identification:
Stem erect or ascending, mostly simple, terete, stiffly hairy. Leaves lower in small rosette; leaves opposite, oblong, lanceolate, slightly toothed, sessile, and longer than broad. Leaves c 3-7 cm long. Flowers light-purple,isolated in the axil of smaller upper leaves, 6-9 mm in diameter, petals 3-9 mm long, sepals equalling 2/3 of the length of petals, Stigmas with 4-crossed lobes. Fruit: capsule 3.5-8 cm long, with small and jointed hairs.
Size:
to 0.6m tall.
Native Range:
Eurasia
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This map only depicts Great Lakes introductions.
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Table 1. Great Lakes region nonindigenous occurrences, the earliest and latest observations in each state/province, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Epilobium parviflorum are found here.
Table last updated 12/18/2020
† Populations may not be currently present.
* HUCs are not listed for areas where the observation(s) cannot be approximated to a HUC (e.g. state centroids or Canadian provinces).
Ecology:
The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires moist or wet soil. It is in flower from July to August. The flowers are hermaphrodite (have both male and female organs) and are pollinated by bees and hoverflies. The plant is self-fertile. It is noted for attracting wildlife.
Means of Introduction:
Unknown. Spread of the plant has been by waterfowl, even though seed dispersal in this group is usually by wind.
Status:
Established
Great Lakes Impacts:
Remarks:
The horizontally pubescence of the stem can cause the species to be confused with native E. strictum Muhl. and the Eurasian E. hirsutum L. Epilobium strictum, however, has entire, nearly linear leaves up to 8 mm wide and the stigma is entire. Both E. hirsutum and E. parviflorum have leaves much wider than 8 mm, and both are distinctly denticulate with deeply 4-lobed stigmas. Epilobium hirsutum has more conspicuous petals, up to 1 cm long, whereas those of E. parviflorum (as the epithet indicates) are smaller, only reaching a centimeter in length. The leaves of E. hirsutum clasp the stem to halfway around its circumference whereas those of E. parviflora are subsessile (Eckel 2002).
References
(click for full reference list)
Other Resources:
INRA-ACTA. 2000. Hypermedia for Plant Protection. Available at http://www.dijon.inra.fr/bga/hyppa/hyppa-a/epipa_ah.htm
Author:
Cao, L.
Contributing Agencies:
Revision Date:
8/14/2008
Citation for this information:
Cao, L., 2024, Epilobium parviflorum Schreb.: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, and NOAA Great Lakes Aquatic Nonindigenous Species Information System, Ann Arbor, MI, https://nas.er.usgs.gov/queries/GreatLakes/FactSheet.aspx?Species_ID=2709, Revision Date: 8/14/2008, Access Date: 5/13/2024
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.