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Add/Drop	Name	Reference	Plots↓	Description
Comm #6741	Carya ovata - Fraxinus americana - Quercus stellata / Helianthus divaricatus Woodland » more details accession code: VB.CC.25848.CARYAOVATAFRAXI	Eastern Ecology Working Group of...	0	This association is a montane Appalachian woodland on amphibole gneiss bedrock with 50-60% cover of trees that average about 15 m tall. The codominant trees in typical stands are Carya ovata, Fraxinus americana, and Quercus stellata. Quercus rubra is also present. The shrub layer consists of saplings of Carya and Fraxinus, as well as Juniperus virginiana var. virginiana, Crataegus sp., and Ceanothus americanus. The herb layer includes a diverse mix of forbs. Some of the most abundant herbs are Carex pensylvanica, Elymus hystrix (= Hystrix patula), and Helianthus divaricatus. Other characteristic herbs include Solidago juncea, Symphyotrichum patens var. patens (= Aster patens var. patens), and Muhlenbergia tenuiflora. This association seems to be a distinct type that reflects the unusual environmental conditions of the woodlands on amphibole gneiss bedrock.
Comm #6742	A.1932 » more details accession code: VB.CC.1634.A1932 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	Successional forests usually dominated or codominated by ~Juglans nigra$, often associated with former homesites or other disturbance on fertile alluvial deposits. Originally described from the Great Smoky Mountains National Park, Tennessee, but may be widespread and range into adjacent states.
Comm #6743	Pinus ponderosa / Pascopyrum smithii Woodland » more details accession code: VB.CC.33258.CEGL000188	Western Ecology Working Group of...	0	This ponderosa pine woodland type is found in the northwestern Great Plains and Black Hills foothills of the United States. At Wind Cave National Park in the Black Hills of South Dakota, stands are best developed on gentle to moderately steep slopes of all aspects except south. On northerly aspects, and in stands with greater tree cover, the more mesophytic graminoids have greater cover. Drier sites may contain a more xerophytic mix of species. At Wind Cave National Park, stands are characterized by a somewhat-open canopy of <i>Pinus ponderosa</i>, with coverage in the 25-50% range. A subcanopy of smaller pines may be present. The shrub stratum is usually sparse, with <i>Amorpha canescens, Artemisia frigida, Rhus trilobata</i>, and <i>Toxicodendron pubescens</i> the most frequently found species. Herbaceous cover is typically greater than 75% and graminoid-dominated. Species composition is quite variable. On northerly aspects and in stands with greater tree cover, the more mesophytic graminoids have greater cover, such as <i>Hesperostipa spartea (= Stipa spartea), Nassella viridula, Elymus canadensis, Muhlenbergia racemosa, Pascopyrum smithii</i>, and <i>Sporobolus heterolepis</i>. <i>Schizachyrium scoparium, Carex inops ssp. heliophila</i> and <i>Hesperostipa comata</i> are the common dominants on drier sites. <i>Piptatherum micranthum (= Oryzopsis micrantha)</i> is dominant at some sites.
Comm #6744	CEGL002683 » more details accession code: VB.CC.5090.CEGL002683 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #6745	Corylus americana - Malus ioensis - Ceanothus americanus Shrubland » more details accession code: VB.CC.37063.CEGL005073	Midwestern Ecology Working Group...	0	This shrubland community is found in the central tallgrass prairie region of the midwestern United States. Stands occur on well-drained uplands found on glacial moraines, kame complexes, and outwash plains. Soils are fine-textured silt-loams. Stands are maintained by fires. Shrubs dominate the canopy, forming copses of <i>Ceanothus americanus, Corylus americana, Prunus americana, Malus ioensis (= Pyrus ioensis), Quercus ellipsoidalis, Quercus macrocarpa</i>, and <i>Salix humilis</i>. The dominant grass was <i>Schizachyrium scoparium</i>, with <i>Danthonia spicata</i> also present. Typical forbs include <i>Apocynum androsaemifolium, Helianthus divaricatus, Lathyrus venosus</i>, and <i>Polygala senega</i>. Few stands of this type remain, making further characterization difficult.
Comm #6746	Pinus ponderosa / Wyethia mollis Woodland » more details accession code: VB.CC.22628.PINUSPONDEROSAW	Western Ecology Working Group of...	0	This is an open woodland found in the eastern Cascades ecoregion in south-central Oregon. This association occurs at elevations between 5000 and 6400 feet in eastern Oregon. Slopes vary from 5-40%. Sites are usually on convex topography over andesite, basalt, or rhyolite. Soils are gravelly silt loams to gravelly clay, and are well-drained. Pinus ponderosa is the major tree cover, varying from 5-50%. Abies concolor often occurs at the upper elevational phases of this association but remains <10% cover. Juniperus occidentalis may occur at <10% cover. Wyethia mollis occurs at <30% cover except in recently disturbed sites where it may be over 50% cover. Other shrubs usually found are Purshia tridentata and Amelanchier alnifolia usually exist at low cover values. Achillea millefolium is usually found up to 10% cover. A number of other forbs and grasses can be found. No single grass species (Elymus elymoides and Poa nervosa) covers more than 10%.
Comm #6747	Ambrosia dumosa Dwarf-shrubland » more details accession code: VB.CC.31747.CEGL005074	Western Ecology Working Group of...	0	This white bursage shrubland association is currently described from Grand Canyon National Park and Grand Canyon-Parashant National Monument in Arizona. More survey and classification work are needed to fully characterize this type. It primarily occurs on sideslopes and plateaus at 475 to 575 m (1600 to 1875 feet) elevation; it rarely occurs as high as 625 m (2025 feet). This association is typically found on moderately sloping gradients (10-15°), but occasionally occurs on much flatter slopes (0-4°). Soils are rapidly-drained sands or sandy loams that lie on top of limestone or sandstone. <i>Ambrosia dumosa</i> dominates the dwarf-shrub layer and characterizes this vegetation type. Tall shrubs such as <i>Larrea tridentata</i> occasionally occur in a poorly-defined stratum. <i>Opuntia acanthocarpa, Ephedra torreyana</i>, and <i>Encelia farinosa</i> regularly occur in a sparse short-shrub layer. The cactus <i>Opuntia basilaris</i> is commonly found in the dwarf-shrub layer. <i>Bromus rubens</i> and <i>Vulpia octoflora</i> occur occasionally in the sparse graminoid layer. <i>Eriogonum inflatum, Gilia</i> sp., <i>Cryptantha</i> spp., <i>Pectocarya</i> sp., and <i>Descurainia pinnata</i> are common forbs.
Comm #6748	A.1857 » more details accession code: VB.CC.1557.A1857 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	Inland dune characterized by large expanses of exposed sand. Exposure of sand in the primarily forested landscape is a result of anthropogenic activity (poor farming practices), or in some cases as a result of past alluvial flooding.
Comm #6749	Hulsea algida Herbaceous Alliance » more details accession code: VB.CC.28446.HULSEAALGIDAHER	Western Ecology Working Group of...	0
Comm #6750	A.1712 » more details accession code: VB.CC.1460.A1712 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	Forb wetlands occurring in depressions, dominated (often essentially monospecific) by ~Pontederia cordata$. This alliance is particularly prevalent in mucky organic soils, of seasonally (or sometimes nearly semipermanently) flooded situations in depression wetlands in Florida.