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(Hypericum prolificum, Eubotrys racemosa) / Schizachyrium scoparium - Solidago simplex var. racemosa - Ionactis linariifolius Riverscour Sparse Vegetation | NatureServe Biotics 2019
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Name: (Hypericum prolificum, Eubotrys racemosa) / Schizachyrium scoparium - Solidago simplex var. racemosa - Ionactis linariifolius Riverscour Sparse Vegetation Reference: NatureServe Biotics 2019 Description: This sparse outcrop vegetation of the Potomac Gorge in Virginia and Maryland occurs on metasedimentary and intrusive igneous rock exposures that are catastrophically flood-scoured. The habitat is variable, with small pools interspersed among shaded microhabitats and exposed xeric microhabitats. The vascular vegetation generally covers &lt;5% of a given area and consists of scattered herbs and dwarfed shrubs. The most characteristic species are <i>Schizachyrium scoparium, Solidago simplex var. racemosa, Dichanthelium acuminatum var. acuminatum, Ionactis linariifolius</i>, and the shrubs <i>Eubotrys racemosa</i> and <i>Hypericum prolificum</i>. Other minor, inconstant species include <i>Andropogon gerardii, Gaylussacia baccata, Juncus dichotomus, Phlox subulata, Veronicastrum virginicum, Hypericum gentianoides, Amelanchier nantucketensis</i>, and <i>Sporobolus clandestinus</i>. Small pools and potholes support inclusions of wetland species, including <i>Ludwigia alternifolia, Scirpus cyperinus, Cephalanthus occidentalis</i>, and <i>Ludwigia palustris</i>. Lichens, especially <i>Xanthoparmelia conspersa</i>, have very high cover on the rock surfaces. The bryophyte <i>Grimmia laevigata</i> is also important in areas with ephemeral seepage or surface water. This association is apparently endemic to the Potomac Gorge.  Accession Code: urn:lsid:vegbank.org:commConcept:35123-{124105D9-27B3-48F1-B896-D4BC4D66877E} Plot-observations of this Community Concept: 11
	Party Perspective according to: NatureServe (organization) Perspective from: 31-May-2007 to: ongoing
	status: accepted Community's Parent: Andropogon gerardii - Sorghastrum nutans Appalachian Gravel Riverscour Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.802098 NatureServe Explorer   Code: CEGL006491   Translated: (Shrubby St. John's-wort, Swamp Doghobble) / Little Bluestem - Sticky Goldenrod - Flaxleaf Whitetop Aster Riverscour Sparse Vegetation   Common: Potomac Gorge Riverside Outcrop Barrens   Scientific: (Hypericum prolificum, Eubotrys racemosa) / Schizachyrium scoparium - Solidago simplex var. racemosa - Ionactis linariifolius Riverscour Sparse Vegetation (convergence) and Synonyms: (similar) (Hypericum prolificum, Leucothoe racemosa) / Schizachyrium scoparium - Solidago simplex var. racemosa - Ionactis linariifolius Sparse Vegetation