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Salix lucida ssp. lasiandra / Urtica dioica ssp. gracilis Swamp Woodland | NatureServe Biotics 2019
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Name: Salix lucida ssp. lasiandra / Urtica dioica ssp. gracilis Swamp Woodland Reference: NatureServe Biotics 2019 Description: According to Christy (2004), the habitat for this association is shrub swamp around shallow lakes and ponds, and along low-gradient streams and river channels in western Oregon and Washington. Stands are usually surrounded by <i>Fraxinus latifolia</i> forest but occur at lower elevations that are too wet for <i>Fraxinus</i>. <i>Salix lucida ssp. lasiandra</i> is the primary tree in this association, with cover averaging 67%. In some stands it may not exceed shrub height. Other shrub species are patchy and include <i>Cornus sericea, Sambucus racemosa</i>, and <i>Salix sitchensis</i>. Because of a history of grazing and proximity to agricultural and urban areas, the herb layer is usually dominated by exotic cultivars of <i>Phalaris arundinacea</i>. Sites with seasonal inundation may have a higher component of native species in the herb layer such as <i>Impatiens capensis, Urtica dioica ssp. gracilis, Bidens frondosa</i>, and <i>Leersia oryzoides</i>. Many sites are associated with shallow ponds and associated mudflat vegetation. Stands are used extensively by beaver, and <i>Salix lucida ssp. lasiandra</i> resprouts vigorously following cropping. Trees appear to senesce after about 40 years and may not readily reproduce if stands are heavily infested with <i>Phalaris arundinacea</i>. Stands are often flooded in winter and historically were sometimes flooded into the growing season, but they need late-season draw-down to survive. Use of water control structures to keep shallow lakes flooded in summer has killed several large stands of <i>Salix lucida ssp. lasiandra</i> in the Portland, Oregon, area, destroying valuable shrub swamp and mudflat habitat.  Accession Code: urn:lsid:vegbank.org:commConcept:32291-{CD85832F-226A-44F6-990F-826D1963EC4C} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 10-Jun-2006 to: ongoing
	status: accepted Community's Parent: Salix lucida Scrub Swamp Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.688691 NatureServe Explorer   Code: CEGL003409   Translated: Pacific Willow / California Nettle Swamp Woodland   Scientific: Salix lucida ssp. lasiandra / Urtica dioica ssp. gracilis Swamp Woodland (convergence) and Synonyms: (similar) CEGL003409 (similar) Salix lucida ssp. lasiandra / Urtica dioica ssp. gracilis Woodland (similar) Salix lucida ssp. lasiandra / Urtica dioica ssp. gracilis Forest