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Add/Drop	Name	Reference	Plots↓	Description
Comm #5131	Populus deltoides / Poliomintha incana Forest » more details accession code: VB.CC.28126.POPULUSDELTOIDE	Western Ecology Working Group of...	0	The type is known only from gypsum dunelands of the Tularosa Basin in south-central New Mexico at elevations around 1220 m (4000 feet). In interdune areas water accumulates during the summer rainy season, and the water table remains near the surface (0.5 m). Populus deltoides establish in these intermittent wetlands and then are buried by shifting gypsum dunes. When mature, Populus deltoides trees form very open canopies (30% or less cover) and may be partially to deeply buried with only the upper portions of the trees exposed. Scattered to well-represented Poliomintha incana typifies the understory, along with an occasional Ericameria nauseosa (= Chrysothamnus nauseosus). Herbs are low in diversity (5 species) and cover and include scattered bunches of Achnatherum hymenoides (= Oryzopsis hymenoides) and Schizachyrium scoparium var. scoparium (= Schizachyrium neomexicanum). Large, open, bare areas are common.
Comm #5132	Opuntia littoralis Shrubland Alliance » more details accession code: VB.CC.27485.OPUNTIALITTORAL	Western Ecology Working Group of...	0	This shrubland alliance of California's outer, southern coastal ranges, the Channel Islands, and coastal Baja California grows on steep slopes with shallow soils. The water-holding capacity of the soils is very low, and the long summer dry season exposes this alliance to severe drought stress. Yearly precipitation is typically less than 30 cm and falls predominantly between November and April. Several cacti and summer-dormant shrubs are part of this community. The alliance is found between sea level and 1200 m, often on south-facing slopes. The conspicuousness, and occasional dominance, of stem-succulent cacti species characterize this coastal scrub alliance. Opuntia spp. are the most common, particularly Opuntia littoralis, Opuntia oricola, Opuntia prolifera, and Opuntia californica var. parkeri (= Opuntia parryi). Several other shrub species are usually present, most of them summer dormant, leaf succulents. These species may include Artemisia californica, Encelia californica, Cneoridium dumosum, Eriogonum fasciculatum, Euphorbia misera, Cleome isomeris, Mirabilis californica, Salvia mellifera, and Lycium spp. Emergent individuals of taller shrubs, such as Rhus integrifolia and/or Sambucus mexicana, can be present. The herbaceous layer is highly variable, but perennial succulents of the genus Dudleya are usually present.
Comm #5133	Yucca schidigera Shrubland [Placeholder] » more details accession code: VB.CC.19082.YUCCASCHIDIGERA	Western Ecology Working Group of...	0
Comm #5134	Pinus taeda - Quercus nigra Forest Alliance » more details accession code: VB.CC.17829.PINUSTAEDAQUERC	Southeastern Ecology Working Gro...	0	This alliance contains natural and semi-natural, dry to dry-mesic forests of the southeastern Coastal Plain, occurring in fire-protected situations, such as swamp islands and barrier islands. The best-documented, natural examples of this alliance are maritime forests of the Outer Coastal Plain and barrier islands from southern Virginia to North Carolina, which are characterized by Pinus taeda and Quercus falcata or Quercus nigra. These maritime examples occur on the lee side of maritime dunes and are protected from salt spray and overwash. The substrate is wind-deposited sand which is rapidly drained and nutrient poor. Other canopy associates include Carya glabra, Fagus grandifolia, Oxydendrum arboreum, Liquidambar styraciflua, Carpinus caroliniana ssp. caroliniana, Persea borbonia, and occasional Quercus virginiana and Ilex opaca. The patchy shrub layer may contain Morella cerifera (= Myrica cerifera), Morella pensylvanica (= Myrica pensylvanica), Rhus copallinum, and Vaccinium corymbosum. Vines are abundant and include Toxicodendron radicans, Vitis rotundifolia, Smilax spp., and Gelsemium sempervirens. The poorly developed herbaceous layer usually is composed of Chasmanthium laxum, Mitchella repens, Pteridium aquilinum, Panicum amarum, and Hypericum gentianoides. Infrequently flooded loblolly pine - mixed hardwood forests of the Coastal Plain and, possibly, outer Piedmont are included here as well, but additional work is needed for characterization. Other less-well-documented examples of this alliance include mesic sandy to sandy-loam slopes in the outer and middle Coastal Plain, in fire-sheltered sites, such as 'islands' of higher ground surrounded by swamps or marshes. These sometimes have some Quercus michauxii in the canopy. In some parts of the alliance's putative range (e.g., East Gulf Coastal Plain, Upper East Gulf Coastal Plain, Mississippi River Alluvial Plain, Upper West Coastal Plain), information about vegetation of this alliance is either lacking, poorly known, or poorly understood.
Comm #5135	Artemisia arbuscula ssp. longiloba / Pascopyrum smithii Shrub Herbaceous Vegetation » more details accession code: VB.CC.33932.CEGL001415	Western Ecology Working Group of...	0
Comm #5136	Populus balsamifera ssp. trichocarpa - Alnus rubra / Carex obnupta Woodland » more details accession code: VB.CC.32166.CEGL003361	Western Ecology Working Group of...	0
Comm #5137	Artemisia nova / Elymus elymoides Shrubland » more details accession code: VB.CC.34326.CEGL001418	Western Ecology Working Group of...	0	This association is found in the foothills, plateaus and mountains of Nevada and Utah. Stands occur on well-drained slopes, knolls and ridges. Substrates are typically shallow, gravelly or stony soils derived from calcareous parent materials such as limestone. These soils are frequently coarse-textured, but subsoil argillic horizons are common. There is often an impenetrable subsurface layer from a duripan, caliche, or bedrock. <i>Artemisia nova</i> plants often grow in adjacent <i>Artemisia tridentata</i> shrublands that are found on deeper soils in basins. Combined ground cover of bare ground, rock and gravel is often high (about 70% cover). Litter is concentrated under the shrub canopies. The vegetation is characterized by an open dwarf-shrub canopy (10-30% cover) that is dominated by <i>Artemisia nova</i> and a sparse herbaceous layer dominated by the perennial graminoid <i>Elymus elymoides</i> with scattered forbs. <i>Atriplex confertifolia, Artemisia tridentata, Chrysothamnus viscidiflorus, Ephedra nevadensis, Ephedra viridis</i>, and <i>Grayia spinosa</i> are common shrub associates that may be present in smaller amounts. The herbaceous layer includes low cover of species of <i>Comandra, Cryptantha, Erigeron, Eriogonum, Machaeranthera, Phlox, Penstemon</i>, and <i>Poa secunda</i>. Introduced annual graminoids such as <i>Bromus rubens</i> and <i>Bromus tectorum</i> are common in disturbed stands.
Comm #5138	Atriplex gardneri / Xylorhiza venusta Dwarf-shrubland » more details accession code: VB.CC.34300.CEGL001446	Western Ecology Working Group of...	0	This dwarf-shrub association occurs on badland topography developed in marine shales in southeastern Utah and is likely to occur in similar habitats in western Colorado. Stands occupy low ridges and the sides of pediments with gentle to moderate slopes and variable aspects between approximately 1300 and 1500 m elevation. The unvegetated surface consists almost entirely of bare ground with little to no litter. Soils are shallow, silty clay-textured, and derived from shales of the Mancos or Morrison formations. The vegetation is characterized by a sparse canopy of the dwarf-shrub <i>Atriplex gardneri</i> with between 1 and 15% cover. Sometimes <i>Atriplex gardneri</i> is the only shrub present, but more often the shrub layer includes scattered individuals of <i>Atriplex confertifolia, Chrysothamnus viscidiflorus, Eriogonum bicolor, Krascheninnikovia lanata</i>, and <i>Picrothamnus desertorum</i>. The herbaceous layer generally only contains a few species, among which <i>Xylorhiza venusta</i> is the most conspicuous. Other forbs include <i>Eriogonum cernuum, Eriogonum inflatum, Sphaeralcea</i> spp., and <i>Machaeranthera grindelioides</i>; grasses provide only trace cover.
Comm #5139	Typha (angustifolia, domingensis) Tidal Herbaceous Alliance » more details accession code: VB.CC.17801.TYPHAANGUSTIFOL	Eastern Ecology Working Group of...	0	Tidal marshes dominated by Typha angustifolia and/or Typha domingensis. Examples of this alliance are composed of a mixture of salt marsh and freshwater tidal marsh species. The vegetation is dense and characterized by tall graminoids such as Typha angustifolia, with associates including Spartina cynosuroides, Phragmites australis or Schoenoplectus americanus (= Scirpus americanus), Pontederia cordata, Lilaeopsis chinensis, Hibiscus moscheutos (= Hibiscus palustris), and Pluchea odorata. Other characteristic species include Hibiscus moscheutos, Spartina patens, Distichlis spicata, Schoenoplectus pungens (= Scirpus pungens), Lycopus americanus, Eleocharis palustris, Hydrocotyle umbellata, Eupatorium capillifolium, Ptilimnium capillaceum, Bidens spp., and Spartina alterniflora. This community is typically a brackish tidal marsh occurring where water salinity ranges from 0.5-18.0 ppt. Brackish marshes are most extensive on large tidal rivers, but smaller marshes of this alliance also occur at the upper limits of larger tidal creeks. The alliance occurs along the Atlantic coast from Maine through South Carolina and along the Gulf coast in Alabama and Texas. Alabama and Texas communities occur in oligohaline tidal marshes and are dominated by Typha domingensis. Further research is necessary to determine the classification, and thus the range, with confidence.
Comm #5140	Phragmites australis Western North America Temperate Ruderal Herbaceous Vegetation » more details accession code: VB.CC.33271.CEGL001475	Western Ecology Working Group of...	0	This reed marsh type is found across the west-temperate regions of the United States and Canada. Stands occur in semipermanently flooded marshes, ditches, impoundments, etc. that have often been disturbed by human activity. The vegetation is often variable, as <i>Phragmites australis</i> will often invade into existing natural or semi-natural communities present on the site. Once firmly established, this community is usually strongly dominated by <i>Phragmites australis</i>, with few or no other vascular plants present. In Colorado, this reed marsh often occurs in small wet patches in seeps and backwater areas of large floodplains, around the fringes of irrigation ponds, ditches, and along railroad embankments that have poor drainage. Stands have a dense, 1- to 1.5-m tall herbaceous layer dominated by the perennial graminoid <i>Phragmites australis</i>. Minor cover of associates such as <i>Agrostis stolonifera, Carex</i> spp., <i>Conyza canadensis, Glycyrrhiza lepidota, Iva axillaris, Mentha arvensis, Schoenoplectus acutus (= Scirpus acutus)</i>, and <i>Typha latifolia</i> may be present.