Invalid Unit Specified
A3374 Impatiens capensis - Symplocarpus foetidus - Caltha palustris Seep Alliance

The U.S. National
Vegetation Classification
Type Concept Sentence: These are circumneutral or slightly calcareous groundwater seeps typically dominated by forbs, including Angelica atropurpurea, Caltha palustris, Impatiens capensis, and Symplocarpus foetidus, and found throughout the Central Appalachian, northeastern and north-central United States and eastern temperate Canada.
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Common (Translated Scientific) Name: Orange Jewelweed - Skunk-cabbage - Yellow Marsh-marigold Seep Alliance
Colloquial Name: Northern Calcareous Seep
Hierarchy Level: Alliance
Type Concept: These circumneutral or slightly calcareous groundwater seeps are typically dominated by forbs, including Angelica atropurpurea, Caltha palustris, Impatiens capensis, and Symplocarpus foetidus. Other species that may be found include Carex lacustris, Carex stricta, Glyceria striata, and Thelypteris palustris. This type is found throughout the Central Appalachian, northeastern and north-central United States and eastern temperate Canada. Stands are found on lower slopes of glacial moraines, ravines, and terraces around seepage areas, where circumneutral or slightly calcareous groundwater seeps to the surface. Peat sometimes accumulates to a depth of 1 m. Other sites have little organic material, with groundwater typically welling up through carbonate-encrusted gravel.
Diagnostic Characteristics: This alliance contains vegetation of circumneutral or slightly calcareous groundwater seeps from the Central Appalachians north through the mid-Atlantic states to New England. The criteria for distinguishing it from other alliances include floristic as well as biogeographic ones.
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: Examples occur as inclusions within other, usually forested, vegetation. As currently defined, this alliance includes only those sites dominated by herbaceous species. Sites that are floristically very similar but occur under a tree canopy are treated as forested seeps and swamps.
Similar NVC Types:
Diphylleia cymosa - Saxifraga micranthidifolia Seep Alliance, note:
Carex atlantica - Solidago patula - Parnassia asarifolia Seep Alliance, note:
Carex gynandra - Glyceria melicaria - Glyceria striata Seep Alliance, note:
Lyonia ligustrina - Photinia pyrifolia / Drosera rotundifolia Seep Alliance, note:
Sanguisorba canadensis - Parnassia grandifolia Seep Alliance, note:
Physiognomy and Structure: This alliance is dominated by forbs.
Floristics: This alliance is dominated by forbs; Angelica atropurpurea, Caltha palustris, Impatiens capensis, and Symplocarpus foetidus are usual dominants. Other species that may be found include Carex lacustris, Carex stricta, Glyceria striata, and Thelypteris palustris. Shrubs and trees from surrounding vegetation types sometimes occur. Typical woody species include Acer rubrum, Fraxinus nigra, and Thuja occidentalis, which may occur at low cover.
Dynamics: No Data Available
Environmental Description: Stands are found on lower slopes of glacial moraines, ravines, and terraces around seepage areas, where circumneutral or slightly calcareous groundwater seeps to the surface. Peat sometimes accumulates to a depth of 1 m. Other sites have little organic material, with groundwater typically welling up through carbonate-encrusted gravel.
Geographic Range: This type is found throughout the Central Appalachian, northeastern and north-central United States and eastern temperate Canada.
Nations: CA, US
States/Provinces: CT, DC, IA, IL, IN, MA, MD?, ME, MI, MN, NB?, NH, NJ, NY, OH, ON, PA, QC?, RI, VA, VT, WI, WV
US Forest Service Ecoregions (1994/1995)
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Confidence Level: Low
Confidence Level Comments:
Grank: GNR
Greasons:
Concept Lineage: Four of five members of the old A.1694 (all of the eastern ones).
Predecessors:
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Synonomy:
Concept Author(s): M. Pyne, in Faber-Langendoen et al. (2013)
Author of Description: M. Pyne and D. Faber-Langendoen
Acknowledgements:
Version Date: 18Dec2014
References:
  • Faber-Langendoen, D., and Midwest State Natural Heritage Program Ecologists. 1996. Terrestrial vegetation of the midwest United States. International classification of ecological communities: Terrestrial vegetation of the United States. The Nature Conservancy, Arlington, VA.
  • Faber-Langendoen, D., J. Drake, M. Hall, G. Kittel, S. Menard, C. Nordman, M. Pyne, M. Reid, M. Russo, K. Schulz, L. Sneddon, K. Snow, and J. Teague. 2013-2017b. Screening alliances for induction into the U.S. National Vegetation Classification: Part 1 - Alliance concept review. NatureServe, Arlington, VA.
  • MNNHP [Minnesota Natural Heritage Program]. 1993. Minnesota's native vegetation: A key to natural communities. Version 1.5. Minnesota Department of Natural Resources, Natural Heritage Program, St. Paul, MN. 110 pp.
  • White, J., and M. Madany. 1978. Classification of natural communities in Illinois. Pages 311-405 in: Natural Areas Inventory technical report: Volume I, survey methods and results. Illinois Natural Areas Inventory, Urbana, IL.