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Add/Drop	Name	Reference	Plots↓	Description
Comm #5121	Atriplex polycarpa / Pleuraphis mutica Shrubland » more details accession code: VB.CC.34236.CEGL001319	Western Ecology Working Group of...	0
Comm #5122	A.874 » more details accession code: VB.CC.2503.A874 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	This alliance occurs at the transition between the Mojave and Great Basin deserts on mountain slopes, mesas or bajadas bordering intermountain basins. Soils are highly variable across the large range of this vegetation type, but are generally coarse-textured and well-drained. This vegetation is characterized by a sparse to moderately dense shrub layer of ~Coleogyne ramosissima$. Although ~Coleogyne$ is apparently restricted to a particular elevational zone, associated shrub species can be of either Mojavean or Great Basin affinities. Shrub species may include ~Menodora spinescens, Picrothamnus desertorum (= Artemisia spinescens), Eriogonum fasciculatum, Ephedra$ spp., ~Atriplex$ spp., ~Grayia spinosa, Larrea tridentata, Chrysothamnus viscidiflorus, Yucca baccata, Gutierrezia sarothrae$, and ~Opuntia$ spp. Occasionally, scattered individuals of ~Yucca brevifolia$ may be emergent through the shrub layer. The herbaceous layer is typically sparse. Species of ~Eriogonum, Navarretia, Sphaeralcea, Pleuraphis jamesii (= Hilaria jamesii), Mirabilis multiflora, Achnatherum hymenoides (= Oryzopsis hymenoides)$, and ~Achnatherum speciosum (= Stipa speciosa)$ may be present. Diagnostic of this alliance is the dominance of ~Coleogyne ramosissima$ in the shrub layer.
Comm #5123	Tetradymia tetrameres Dune Sparse Vegetation » more details accession code: VB.CC.26624.TETRADYMIATETRA	Western Ecology Working Group of...	0
Comm #5124	Quercus fusiformis - Persea borbonia Forest » more details accession code: VB.CC.21614.QUERCUSFUSIFORM	Southeastern Ecology Working Gro...	0	The natural forms of this community consist of closed to open canopy Quercus fusiformis [see comments on oak taxonomy below] forests on deep, hummocky sands, mostly on the Ingleside barrier-strandplain along the Texas Gulf Coastal Bend. Three variants of this community have been described. One type, the maritime variant, occurs on stabilized dunes composed of deep sand that stretch along San Antonio Bay. This variant is characterized by a relatively `tall' (8-12 m) forest dominated by Quercus fusiformis. Other trees that reach the canopy include Persea borbonia and Quercus hemisphaerica. The midcanopy is dominated by Persea borbonia and Quercus hemisphaerica with Celtis laevigata and Quercus marilandica occurring as occasional associates. The understory includes Ilex vomitoria and Callicarpa americana. A characteristic member of the sparse ground layer is Scleria triglomerata. On the backside of the dunes, the canopy becomes more open, and the forest supports a more diverse shrub and ground layer with the addition of Vaccinium arboreum, Zornia bracteata, Helianthemum sp., Aeschynomene viscidula, and Croton argyranthemus. This community may warrant separation as a unique association, but very few accessible examples of it remain. It has possibly been severely impacted by coastal development and in some cases by coastal erosion. The other two variants occur on the ridge-and-swale topography of the Ingleside barrier-strandplain. This area supports a `running-live oak' shrubland variant and the oak motte variant. The oak motte variant occurs on the higher `ridges' of the Ingleside barrier-strandplain. Though Celtis laevigata may be present in the canopy, it is dominated almost solely by Quercus fusiformis. Tillandsia recurvata is a common epiphyte of this community. The subcanopy and shrub layer may include Celtis laevigata, Quercus hemisphaerica, Callicarpa americana, Ilex vomitoria, Persea borbonia, Morella cerifera, and numerous woody vines, including Smilax bona-nox, Ampelopsis arborea, Toxicodendron pubescens, and Vitis mustangensis. The shrub layer may be dense at the edge of the motte but is often open beneath the dense canopy. Characteristic components of the sparse herbaceous layer include Malvaviscus arboreus var. drummondii, Scleria triglomerata, and Erythrina herbacea. The shrubland variant often appears to be a monoculture of shrubby (1.5-6 m in height) Quercus fusiformis, but other components of the oak motte variant are also found here, including larger Quercus fusiformis trees, Quercus hemisphaerica, Persea borbonia, Morella cerifera (= Myrica cerifera) (usually in swales), Toxicodendron pubescens, Callicarpa americana, Vitis mustangensis, Ilex vomitoria, Erythrina herbacea, and scattered Quercus marilandica. Small openings with Sorghastrum nutans hint at what is thought to have been the historical condition of these areas. These `running-live oak' thickets are thought to be a modified community that is the result of years of fire suppression and severe grazing pressures. Once this shrubland is established, it is difficult to restore the grassland community to these areas. Typical herbs of canopy openings (and associated grasslands) include Schizachyrium littorale (= Schizachyrium scoparium ssp. littorale), Eriogonum multiflorum, Stylosanthes viscosa, Helianthemum georgianum, Croton glandulosus, Paspalum setaceum, Tradescantia humilis, Physalis cinerascens var. spathulifolia, Palafoxia hookeriana, Scleria triglomerata, Thelesperma nuecense, Lechea mucronata, Liatris elegans var. carizzana, Froelichia floridana, and Trichoneura elegans. This forest is associated with grasslands dominated by Schizachyrium littorale, Paspalum plicatulum, Andropogon gerardii, Sorghastrum nutans, and, in swales, Paspalum monostachyum.
Comm #5125	Artemisia tridentata (ssp. tridentata, ssp. xericensis) Shrubland Alliance » more details accession code: VB.CC.17875.ARTEMISIATRIDEN	Western Ecology Working Group of...	0	These shrublands occur throughout the Intermountain West from the western Great Basin to the northern Rocky Mountains and Colorado Plateau. Sites supporting this alliance include sloping fans, footslopes, rolling hills, and deep, well-drained alluvial bottomlands. Soils are deep, fine- to medium-textured alluvial soils with some source of subirrigation during the summer season, but moderately deep upland soils with ample moisture storage also support these shrublands. Some stands occur on deep, sandy soils, or soils that are highly calcareous. The vegetation included in this alliance is characterized by a somewhat sparse to moderately dense (10-70% cover) shrub layer of Artemisia tridentata ssp. tridentata or Artemisia tridentata ssp. xericensis. Shrub associates include Ericameria nauseosa (= Chrysothamnus nauseosus) or Chrysothamnus viscidiflorus which increase with disturbance. Other shrubs occasionally present include Purshia tridentata, Ephedra viridis, Gutierrezia sarothrae, Tetradymia canescens, Sarcobatus vermiculatus, and Atriplex spp. Occasionally individual trees are present in some stands. The relatively sparse herbaceous layer is dominated by bunch grasses (<20% cover) that occupy patches in the shrub matrix. The most widespread species is Pseudoroegneria spicata, which occurs from the Columbia Basin to the northern Rockies. Other locally dominant or important species include Leymus cinereus, Festuca idahoensis, Pascopyrum smithii, Elymus lanceolatus, Elymus elymoides, Pleuraphis jamesii (= Hilaria jamesii), Koeleria macrantha, Muhlenbergia richardsonis, Hesperostipa comata (= Stipa comata), and Poa secunda. Forbs are generally of low importance and are highly variable across the range. Mosses and lichens are important ground cover in some stands. Diagnostic of this alliance is the Artemisia tridentata ssp. tridentata- or Artemisia tridentata ssp. xericensis-dominated shrub layer that lacks a significant graminoid layer (<20% cover perennial graminoids) or has over 40% total cover of shrubs.
Comm #5126	A.939 » more details accession code: VB.CC.2564.A939 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	This riparian shrubland alliance of the Columbia Plateau and Palouse region occur on slopes, in canyons, and forest openings in the mountains. The substrate is usually exposed, but surface water can be present for variable periods without detectable seasonal periodicity. Inundation is not predictable to a given season and is dependent upon highly localized rainstorms. ~Philadelphus lewisii$ dominates the shrub layer. Additional information on landforms, soils, and adjacent upslope vegetation was not available.
Comm #5127	CEGL000092 » more details accession code: VB.CC.2719.CEGL000092 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #5128	A.665 » more details accession code: VB.CC.2307.A665 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	This woodland occurs within a matrix of coastal grassland. It is characterized by an open, patchy canopy with grass-dominated openings. The overstory is dominated by ~Quercus virginiana$ and ~Carya illinoinensis$ with lesser amounts of ~Celtis laevigata var. laevigata, Quercus stellata$, and ~Ulmus alata$. The understory typically includes ~Ilex vomitoria, Crataegus$ spp., ~Diospyros virginiana$, and ~Sideroxylon$ sp. Common herbaceous species include ~Paspalum plicatulum, Axonopus$ spp., and ~Schizachyrium scoparium$. This alliance typically occurs over heavy-textured, neutral or basic soils on elevated areas within the coastal prairie. It is found in floodplains, but is rarely flooded.
Comm #5129	Prosopis glandulosa / Atriplex canescens Shrubland » more details accession code: VB.CC.32831.CEGL001382	Western Ecology Working Group of...	0	From Muldavin et al. (2000b): This is a major community of the Tularosa basin and occasional within the southern Jornada del Muerto of New Mexico. This low-elevation community occurs on alluvial or basin flats and on extensive coppice dunefields. Both stands lack significant aspect and have similar surface soils (sand to loamy sand), that overlie more developed, clayey soils (Haplargids). However, alluvial sites include sandy loams, cobble on the surface, and may sometimes have alkaline soils. Steep, tall, and rolling dunes, in contrast to alluvial sites, which are generally on flat surfaces, characterize surface topography on coppice dune sites. This Chihuahuan Desert shrubland is characterized both by stands of large-diameter (30+ m) <i>Prosopis glandulosa</i> shrubs growing on tall and rolling coppice dunes and by stands on low-elevation flats. Both sites are dominated by <i>Prosopis glandulosa</i> and share <i>Atriplex canescens</i>, which grows in the interdune or inter-shrub spaces, as the codominant species. Overall, species diversity is low, but stands may occasionally include scattered <i>Gutierrezia sarothrae</i> (a suggested phase) and <i>Sporobolus flexuosus</i>. Additional suggested phases include <i>Suaeda moquinii</i>, specifically on alluvial sites, and <i>Psorothamnus scoparius</i>.
Comm #5130	Tilia americana - Acer saccharum - Acer nigrum / Laportea canadensis Forest » more details accession code: VB.CC.27602.TILIAAMERICANAA	Eastern Ecology Working Group of...	0	This type is a floodplain forest of streams with small (less than 2 square mile) watersheds, currently known only from coastal New Hampshire (Great Bay watershed) and southern Maine. Soils are poorly drained, silty loams with very shallow or no organic horizons. Dominant canopy species are Tilia americana and Fraxinus americana, with less abundant or less frequent associates Acer saccharum, Carya ovata, Acer rubrum, Ulmus americana, Quercus rubra, and Acer nigrum. Shrubs may include Carpinus caroliniana, Cornus amomum, Viburnum lentago, and associated herbs include Laportea canadensis, Solidago rugosa, Athyrium filix-femina, Boehmeria cylindrica, Impatiens capensis, Ludwigia palustris, Onoclea sensibilis, and Thalictrum pubescens.