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Add/Drop	Name	Reference	Plots↓	Description
Comm #4971	Limestone - Dolostone Great Lakes Shore Cliff Sparse Vegetation » more details accession code: VB.CC.19272.LIMESTONEDOLOST	Midwestern Ecology Working Group...	0	This limestone - dolostone cliff community is found along the northern Great Lakes shorelines in the United States and Canada. Stands occur both as open exposed cliff faces and as low exposures concealed by forest cover. Exposed cliff faces are often wind-swept and experience extreme temperature fluctuations, with little vegetation. Plants growing in crevices include Deschampsia caespitosa, Pellaea glabella, Physocarpus opulifolius, Polypodium virginianum, and Thuja occidentalis. Where cliffs are largely concealed by a forest canopy, their climatic conditions are moderated, and many other herbaceous species are found, including Aralia nudicaulis, Cystopteris bulbifera, Cystopteris fragilis, Geranium robertianum, and Trientalis borealis. Other woody species present include Tilia americana, Acer spicatum, and Taxus canadensis. Mosses may also be common.
Comm #4972	Hesperostipa comata Colorado Front Range Herbaceous Vegetation » more details accession code: VB.CC.34140.CEGL001702	Western Ecology Working Group of...	0	This association is restricted to Colorado. It is found at low elevations along the eastern slope of the Rocky Mountains or on rock outcrops in the northeastern part of the state. It is found in a narrow elevational range from 1555 to 1755 m (5100-5760 feet), on eastern and western 'hogback' slopes and on rocky outcrops. It is restricted to soils derived from sandstone or limestone. <i>Hesperostipa comata (= Stipa comata)</i> is important in this herbaceous association.
Comm #4973	Tsuga heterophylla - Chamaecyparis nootkatensis / Vaccinium ovalifolium Forest » more details accession code: VB.CC.35986.CEGL003239	DeMeo, T., J. Martin, and R. A. ...	0
Comm #4974	Tsuga heterophylla - Chamaecyparis nootkatensis / Vaccinium ovalifolium / Lysichiton americanus Forest » more details accession code: VB.CC.35987.CEGL003240	DeMeo, T., J. Martin, and R. A. ...	0
Comm #4975	Spartina patens - Schoenoplectus pungens - Solidago sempervirens Herbaceous Vegetation » more details accession code: VB.CC.31214.CEGL004097	Eastern Ecology Working Group of...	0	This community is an upland dune grassland or overwash area of Atlantic barrier islands on embryo dunes or back sides of beaches forming from wave-deposited sand during spring tides or storms. This vegetation sometimes arises when overwash sand is deposited on interdunal swales, resulting in the occasional presence of wetland indicators. This association ranges from Massachusetts to North Carolina.. Sand movement, plant burial, and dune formation rates are not so high as to form <i>Ammophila breviligulata</i>-dominated primary dunes, but can be found as a fringe around the outer edge of those dunes. <i>Spartina patens</i> is dominant, ranging from quite sparse (25% cover) to dense, and can be monotypic in early-successional expressions. Where it forms over buried interdunal swales, remnant individuals of <i>Schoenoplectus pungens (= Scirpus pungens)</i> may be present. <i>Solidago sempervirens</i> is a common associate. Less common associates can include <i>Cyperus grayi, Cenchrus tribuloides, Setaria parviflora, Festuca rubra, Schizachyrium littorale, Pseudognaphalium obtusifolium (= Gnaphalium obtusifolium)</i>, and occasional scattered individuals of <i>Toxicodendron radicans</i> and seedlings of <i>Baccharis halimifolia</i>. Bare sand is often visible through the vegetation, and there is no soil profile development. <i>Ammophila breviligulata</i> and, at the southern end of the range, <i>Uniola paniculata, Panicum amarum var. amarum</i>, or <i>Panicum amarum var. amarulum</i> may invade from the surrounding dunes. On the Virginia Eastern Shore, a somewhat xerophytic variant of this community occurs on low, narrow, relatively stable backdune ridges between interdune swales, dominated by <i>Spartina patens</i> but supporting a number of drought-tolerant associates such as <i>Triplasis purpurea, Oenothera humifusa, Opuntia </i><i>humifusa, Physalis walteri, Cirsium horridulum var. horridulum</i>, and <i>Eragrostis spectabilis</i>.
Comm #4976	Tsuga mertensiana - Chamaecyparis nootkatensis / Gaultheria shallon Woodland » more details accession code: VB.CC.24072.TSUGAMERTENSIAN	Western Ecology Working Group of...	0
Comm #4977	Fraxinus pennsylvanica / Cornus foemina / Carex bromoides Forest » more details accession code: VB.CC.18920.FRAXINUSPENNSYL	Southeastern Ecology Working Gro...	0	This forest is described from tributary swamps of the Northwest and North Landing rivers in extreme southeastern Virginia. Stands contain tall, well-formed individuals of Fraxinus pennsylvanica which strongly dominate the canopy layer or have high cover value in mixed stands with Acer rubrum, Nyssa biflora, and Taxodium distichum. A few stands are dominated by Populus heterophylla, these presumably representing a temporary successional phase. Subcanopy tree layers are well-developed, with Fraxinus pennsylvanica usually most abundant and Acer rubrum, Liquidambar styraciflua, Nyssa biflora, and Ulmus americana well represented. Cornus foemina, an irregular component of tupelo - bald-cypress swamps, is a constant, characteristic, and often dominant shrub. Other more-or-less characteristic shrubs include Carpinus caroliniana ssp. caroliniana, Itea virginica, Vaccinium fuscatum, Viburnum nudum, and Viburnum recognitum (= Viburnum dentatum var. lucidum). Vines, especially Decumaria barbara, Berchemia scandens, Toxicodendron radicans, and Smilax spp., are common. The herbaceous layer is typically lush and usually characterized by high cover of Carex bromoides. Other constant herbs are Boehmeria cylindrica, Carex seorsa, Cicuta maculata, Commelina virginica, Dichanthelium dichotomum, Osmunda regalis var. spectabilis, and Saururus cernuus. Less constant but more diagnostic herbs include Carex festucacea, Carex laevivaginata, Impatiens capensis, Glyceria striata, Mimulus alatus, and Zephyranthes atamasca. Because this community type often occupies small, narrow tributary swamps surrounded by agricultural or residential lands, it is particularly prone to invasion by a number of aggressive exotics, including Lonicera japonica, Microstegium vimineum, Ligustrum sinense, and Lycopus europaeus. This community occupies the edges of backswamps and the smaller tributary swamps, as a rule occurring topographically higher in the watersheds than the Taxodium distichum - Nyssa aquatica / Fraxinus caroliniana Forest (CEGL007431) in areas within the Mid-Atlantic Coastal Plain where these two types co-occur. Microtopography of habitats is somewhat variable and frequently exhibits slight hummock-and-hollow relief. The hydrology is seasonally to less often semipermanently flooded. Habitats may draw down completely during the growing season but in some localities retain shallow water in hollows or pools. Some stands of this vegetation are never impacted by wind tides while other stands, located at the lower topographic limits of the type, are occasionally flooded by exceptional wind-tidal events.
Comm #4978	Chrysoma pauciflosculosa - (Clinopodium coccineum) Dwarf-shrubland » more details accession code: VB.CC.21504.CHRYSOMAPAUCIFL	Southeastern Ecology Working Gro...	0	This association occurs on inland, river-associated, xeric, coarse sand ridges in the Coastal Plain of Georgia and perhaps South Carolina. Scattered trees can occur, including Quercus hemisphaerica, Quercus laevis, and Magnolia grandiflora. Chrysoma pauciflosculosa is the dominant dwarf-shrub. Other characteristic species include Cnidoscolus stimulosus, Licania michauxii, and Bulbostylis warei.
Comm #4979	Non-alkaline Cobble - Gravel Great Lakes Shore Sparse Vegetation » more details accession code: VB.CC.36938.CEGL002508	Midwestern Ecology Working Group...	0	This non-alkaline cobble - gravel Great Lakes shore type is found along the shores of northern Great Lakes in the United States and Canada. Substrates currently identified include a combination of siltstones, shales, and sandstones. Sites identified in Michigan are almost completely covered by a gravel and cobble beach and support no vegetation. The exposures are subject to too much wave action to support a distinctive plant community. Rangewide description is still needed.
Comm #4980	Quercus prinus - Quercus marilandica Woodland Alliance » more details accession code: VB.CC.23897.QUERCUSPRINUSQU	Southeastern Ecology Working Gro...	0	Woodlands in this alliance occur on south- to west-facing slopes in the Piedmont and are dominated by Quercus prinus and Quercus marilandica, which may be widely spaced and dwarfed. The exposure and topography at these sites contribute to maintenance of woodland physiognomy. Rocks, typically quartzite exposures, are present at the surface. Vaccinium pallidum and Vaccinium stamineum are typical in the shrub layer.