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Add/Drop	Name	Reference	Plots↓	Description
Comm #9741	Quercus prinus - Quercus rubra - Carya ovalis / Carex pensylvanica - (Calamagrostis porteri) Forest » more details accession code: VB.CC.37179.CEGL008516	Fleming, G. P., and P. P. Coulli...	0	This community is currently known from the southern part of the Central Appalachians, on the northern Virginia Blue Ridge and higher ridges of the Ridge and Valley in western Virginia and adjacent West Virginia. Occurrences in western Maryland and central and western Pennsylvania should be sought. This association usually occupies middle to upper slopes and narrow ridge crests underlain by various sedimentary and metamorphic rocks, including sandstone, quartzite, siltstone, metasiltstone, phyllite, acidic shale, and rarely amphibolite. Among 53 Virginia plot samples, elevation ranges from 550-1270 m (2000-4160 feet), but the type is most common between 760 and 1100 m (2500-3600 feet). The moisture potential of plot-sampling sites was assessed as submesic or subxeric. Slopes vary from steep to sublevel, with aspects ranging from northeast to west. This association has an open, mixed canopy dominated by several oaks and hickories. Trees tend to be slightly stunted (often <20 m tall) on the drier and more exposed sites. <i>Quercus rubra, Quercus prinus</i>, and <i>Carya ovalis</i> are the most abundant canopy species, but <i>Quercus alba</i> is a constant minor associate that becomes more abundant and replaces <i>Quercus prinus</i> at the highest elevations. <i>Carya ovata, Carya glabra, Fraxinus americana</i>, and <i>Quercus velutina</i> are minor overstory associates. The subcanopy tends to be strongly dominated by <i>Carya ovalis</i>. Lower understory layers tend to be open or sparse with scattered <i>Ostrya virginiana, Crataegus macrosperma, Amelanchier arborea, Acer pensylvanicum</i>, and tree saplings. <i>Vaccinium stamineum, Vaccinium pallidum, Rosa carolina</i>, and <i>Spiraea betulifolia var. corymbosa</i> commonly form a patchy low-shrub layer. The herb layer is open but moderately diverse with drought-tolerant graminoids and forbs.
Comm #9742	CEGL000011 » more details accession code: VB.CC.2639.CEGL000011 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #9743	Quercus prinus - Quercus rubra / Vaccinium pallidum - (Rhododendron periclymenoides) Forest » more details accession code: VB.CC.37153.CEGL008523	Fleming, G. P., and P. P. Coulli...	0	This community is documented primarily from the northern Blue Ridge and its eastern foothills, from Amherst County in west-central Virginia to the Catoctin Mountains of northern Maryland, and extending into northeastern West Virginia. It is likely to be more widespread, but certain topographic and/or soil conditions on the northern Blue Ridge may favor its development and abundance there. This community occupies sites intermediate between the xeric, oligotrophic sites of chestnut oak/heath forests and the somewhat sheltered, submesic, subacidic sites of other montane mixed oak and oak-hickory forests. It occurs on chiefly convex, moderately steep middle to upper slopes, ridge crests, and boulderfields with southeastern to northwestern exposures. Soils are subxeric or xeric and strongly infertile. Many sites have high cover of boulders, cobbles, gravel, or mineral soil. Underlying bedrock includes massive quartzite of the Chilhowee group, various members of the northern Blue Ridge gneissic granitic complex, and less frequently metabasalt of the Catoctin Formation. This type spans a very broad range of elevations, from <300 m to nearly 1100 m (<1000-3600 feet). <i>Quercus prinus</i> and <i>Quercus rubra</i> generally codominate the overstory, but either species may dominate discrete areas within stands. Minor canopy associates include <i>Quercus velutina, Quercus alba, Betula lenta, Carya</i> spp., <i>Robinia pseudoacacia</i>, and <i>Pinus strobus</i>. <i>Acer rubrum</i> cover may equal or exceed that of the diagnostic oak species in stands with recent harvesting. The shrub layer is dominated by patchy <i>Vaccinium pallidum, Vaccinium stamineum, Rhododendron periclymenoides</i>, and <i>Kalmia latifolia</i>. <i>Acer pensylvanicum</i> and <i>Smilax rotundifolia</i> may be present in minor amounts. A suite of low-cover, xerophytic herbs is characteristic, including <i>Houstonia longifolia, Campanula divaricata, Potentilla canadensis, Lysimachia quadrifolia, Carex pensylvanica, Aureolaria laevigata</i>, and <i>Hieracium paniculatum</i>.
Comm #9744	Quercus prinus / Quercus ilicifolia / Danthonia spicata Woodland » more details accession code: VB.CC.37176.CEGL008526	Fleming, G. P., and P. P. Coulli...	0	The known range of this vegetation type includes the extreme northern end of the Southern Blue Ridge, the western flank of the Northern Blue Ridge, and the Ridge and Valley region of Virginia and Maryland. The likely global range encompasses the entire Central Appalachian extent of these provinces in Virginia, West Virginia, Maryland, and Pennsylvania. Stands are generally confined to low elevations, up to about 840 m (2760 feet), but exceptionally to 1100 m (3600 feet). Habitats are mostly steep, south- to west-facing, middle to upper slopes with abundant shale outcrops, loose stones, and exposed mineral soils. However, substrates appear to be relatively stable and lack the ongoing erosional processes of shale barrens, which these habitats often border on the landscape. Slope shape is typically convex in at least one direction. Site moisture potential is very low. This community is an open to very open woodland dominated by <i>Quercus prinus</i>. Overstory trees are often stunted and gnarled. <i>Quercus rubra</i> and <i>Carya glabra</i> are constant, usually minor canopy associates that attain codominance with <i>Quercus prinus</i> locally. <i>Pinus virginiana</i> is an important canopy associate in some situations, but is entirely absent from other stands of the type. Understory tree layers are sparse, consisting mostly of younger reproduction of the canopy species. <i>Quercus ilicifolia, Vaccinium stamineum</i>, and <i>Vaccinium pallidum</i> are the chief species of a patchy shrub layer, which may also include <i>Rosa carolina, Amelanchier arborea</i>, and <i>Viburnum rafinesquianum</i>. <i>Quercus ilicifolia</i> usually forms open colonies in this community type, rather than the dense thickets characteristic in pyrophytic pine-oak/heath vegetation. The herb layer is typically quite patchy and sparse but contains a surprising diversity of xerophytic graminoids and forbs.
Comm #9745	Tsuga heterophylla - Chamaecyparis nootkatensis / Vaccinium ovalifolium - Menziesia ferruginea Forest » more details accession code: VB.CC.24856.TSUGAHETEROPHYL	Western Ecology Working Group of...	0
Comm #9746	Tsuga canadensis - Betula alleghaniensis / Veratrum viride - Carex scabrata - Oclemena acuminata Forest » more details accession code: VB.CC.37157.CEGL008533	Fleming, G. P., and P. P. Coulli...	0	This community is currently known from scattered sites in the northern Blue Ridge and Ridge and Valley provinces of Virginia. Similar communities have been observed in the high Allegheny Mountains of Virginia and West Virginia, the Maryland Blue Ridge, and the Ridge and Valley of east-central West Virginia. Occurrences in Pennsylvania also seem likely. The type appears to be limited to higher-elevation montane wetlands in a portion of the central Appalachians where <i>Rhododendron maximum</i> is infrequent to absent. Sites are usually located in high-elevation valleys or slope concavities, in diffuse stream headwaters and lateral, groundwater-saturated flats along larger streams. Occasionally, stands occupy gentle depressions or basins influenced by seasonally perched groundwater but without flowing streams. Elevation ranges from 670-1170 m (2200-3840 feet), though most occurrences are above 900 m (3000 feet). Habitats are flat to moderately sloping and typically have >20% surface cover of boulders and stones weathered from metabasalt, granitic rocks, or sandstone. Stream-bottom habitats have pronounced hummock-and-hollow microtopography, with moss-covered mounds and intertwining roots of <i>Betula alleghaniensis</i>, mucky pools, and braided drainage channels. Canopy dominance is shared by <i>Tsuga canadensis</i> and <i>Betula alleghaniensis</i> in variable proportions. Minor canopy associates include <i>Acer rubrum, Fraxinus americana, Pinus strobus, Quercus alba</i>, and <i>Quercus rubra</i>. Small-tree and shrub layers are open to sparse, with <i>Acer pensylvanicum, Hamamelis virginiana, Ilex verticillata</i>, and <i>Kalmia latifolia</i> the most frequent species. <i>Alnus incana ssp. rugosa</i> is a dominant shrub in one sampled plot. <i>Rhododendron catawbiense</i> is scattered in some stands of this community in the southern part of the northern Blue Ridge but does not form dense stands. The herb layer is well-developed and usually lush with forbs.
Comm #9747	Abies grandis / Polemonium pulcherrimum Forest » more details accession code: VB.CC.27004.ABIESGRANDISPOL	Western Ecology Working Group of...	0
Comm #9748	Quercus havardii - (Penstemon ambiguus, Croton dioicus) / Sporobolus giganteus Shrubland » more details accession code: VB.CC.22688.QUERCUSHAVARDII	Southeastern Ecology Working Gro...	0	This community occupies stabilized dunes of quartz sand in the eastern Trans-Pecos of Texas. Quercus havardii dominates the shrub layer, especially on dune summits and upper slopes. Other shrubs include Penstemon ambiguus, Croton dioicus, Stillingia sylvatica, Calylophus berlandieri ssp. berlandieri, and Yucca campestris. The herb stratum is dominated by Sporobolus giganteus, with Calamovilfa gigantea, Andropogon hallii, Panicum havardii, and Paspalum setaceum (= var. stramineum) also present and locally common. This community is influenced by the processes of dune formation, migration, and stabilization; it is favored by disturbance, while more stabilized areas are dominated by Prosopis glandulosa var. glandulosa and Artemisia filifolia.
Comm #9749	CEGL008043 » more details accession code: VB.CC.7578.CEGL008043 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #9750	Arctostaphylos pungens Shrubland » more details accession code: VB.CC.20542.ARCTOSTAPHYLOSP	Western Ecology Working Group of...	0	This chaparral association has been described from the Virgin Mountains in southern Nevada, Markagunt Plateau in southwestern Utah, the Mogollon Rim in Arizona south to the Animas Mountains in southwestern New Mexico. Sites include dry, gentle to moderate slopes of mountains and plateaus. Substrates are variable and range from rocky, coarse-textured soil to clay loam. The vegetation is characterized by a typically dense, tall-shrub layer dominated by Arctostaphylos pungens (50-70% cover) with sparse short-shrub or herbaceous layers. Associated shrubs vary geographically with Arctostaphylos patula, Amelanchier utahensis, Ceanothus spp., Cercocarpus ledifolius, Ephedra viridis, Garrya flavescens, Mahonia fremontii, Quercus gambelii, Quercus turbinella, or Robinia neomexicana present in the northern extant and Arctostaphylos pringlei, Ceanothus spp., Garrya wrightii, Nolina microcarpa, Quercus hypoleucoides, Quercus turbinella, or scattered Quercus rugosa or Pinus discolor trees present in the southern extent. The herbaceous layer, if present, consists of sparse cover of grasses or forbs.