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Name
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Reference
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Plots↓
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Description |
Comm #12921
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Salicornia virginica Tidal Herbaceous Alliance
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accession code: VB.CC.18429.SALICORNIAVIRGI
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Western Ecology Working Group of... |
0
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Comm #12922
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Thuja plicata Giant Forest Alliance
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accession code: VB.CC.18283.THUJAPLICATAGIA
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Western Ecology Working Group of... |
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This giant forest alliance occurs within the maritime-influenced region of the Pacific Northwest from Oregon to British Columbia, Canada, primarily west of the crest of the Cascades and outside major coastal fog influence. Climate is moderate with only mild drought and frost, generally on sites which are moist to very wet. Elevation ranges from sea level to approximately 1000 m. Soil types are variable across its range, but most commonly with fine-textured, bottomland soils, usually with low nutrient concentrations. Thuja plicata trees appear to be quite tolerant of stagnant winter water tables. These forests are characterized by a multi-tiered tree canopy of Thuja plicata that is typically codominated by Tsuga heterophylla and over 50 m in height. Pseudotsuga menziesii and Abies grandis may also be present. With increasing stand age, Thuja plicata becomes more prominent in the canopy. Most commonly the canopy includes other tree species, but can become monotypic on swampy sites. Broad-leaved cold-deciduous trees, such Acer macrophyllum, Alnus rubra, Cornus nuttallii, and Populus balsamifera ssp. trichocarpa, often form a sparse subcanopy, particularly in gaps in the upper canopy. In southern Oregon stands, additional subcanopy tree species may include Chrysolepis chrysophylla (= Castanopsis chrysophylla), Arbutus menziesii, and Lithocarpus densiflorus. The shrub layer is commonly composed of Linnaea borealis, Gaultheria shallon, Rhododendron macrophyllum, and Mahonia nervosa. The herbaceous layer is usually dominated by shade-tolerant / moisture-loving forbs and ferns such as Achlys triphylla, Oxalis oregana, Viola sempervirens, Trillium ovatum, Trientalis borealis ssp. latifolia (= Trientalis latifolia), Polystichum munitum, Blechnum spicant, and Athyrium filix-femina. Late successional stands typically have very large trees, huge amounts of woody debris, and better developed understories. Diagnostic of this forest alliance is a tree canopy over 50 m tall that is codominated by Thuja plicata. |
Comm #12923
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Artemisia tripartita ssp. tripartita Shrub Herbaceous Alliance
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accession code: VB.CC.19293.ARTEMISIATRIPAR
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Western Ecology Working Group of... |
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This alliance is distributed from the Columbia Basin east to the northern Rockies. Climates range from semi-arid in intermountain basins to subhumid in higher elevations of the Rocky Mountains. Stands occur on flat to steeply sloping upland sites. Soil texture is loam, sandy loam, or clay loam, but is highly variable. Vegetation is characterized by an open, conspicuous shrub layer with herbaceous species having equal or greater coverage. Artemisia tripartita typically has 10-25% cover. Artemisia frigida, Artemisia tridentata ssp. tridentata, Artemisia tridentata ssp. vaseyana, Chrysothamnus viscidiflorus, Krascheninnikovia lanata, Purshia tridentata, or Tetradymia canescens may also be common. The herbaceous stratum is typically dominated by graminoids and of moderate to moderately high cover (25-70%). Pseudoroegneria spicata and Festuca idahoensis are the most common associates. Other locally abundant graminoid species include Hesperostipa comata (= Stipa comata), Festuca campestris, Carex filifolia, Bouteloua curtipendula, Bouteloua gracilis, and Koeleria macrantha. Forbs form a minor and highly variable portion of this vegetation. Recurrent species include Achillea millefolium, Camelina microcarpa, Balsamorhiza sagittata, Sphaeralcea coccinea, Erigeron spp., Opuntia spp., and Phlox spp. |
Comm #12924
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Artemisia filifolia / Andropogon hallii - Achnatherum hymenoides Gypsum Dune Shrubland
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accession code: VB.CC.26148.ARTEMISIAFILIFO
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Southeastern Ecology Working Gro... |
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This community occurs on very active gypsum dunes. Cover is sparse, and large patches of bare gypsum sand occur. Artemisia filifolia is the only shrub. The only grasses are Andropogon hallii and Achnatherum hymenoides (= Oryzopsis hymenoides). Somewhat more stable and vegetated areas are occupied by the Artemisia filifolia - Psorothamnus scoparius - Dalea lanata Gypsum Dune Shrubland (CEGL004561). |
Comm #12925
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CEGL000921
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accession code: VB.CC.3523.CEGL000921
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #12926
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Panicum virgatum - Calamovilfa arcuata Herbaceous Vegetation
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accession code: VB.CC.25624.PANICUMVIRGATUM
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Southeastern Ecology Working Gro... |
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This scour prairie community occurs on moderately wet to relatively well-drained scour zones on the rocks, boulders, and cobbles that form the banks of larger streams and rivers of the Ouachita Mountains. It is best expressed where the rivers have cut through rock outcrops and bare rock is exposed, often adjoining rocky bluffs. Vegetation is typically short (0.5-1 m), and bare rock exposures are common. Species composition is variable depending in part on size of river and width of riverbank. Commonly dominant are Panicum virgatum, Schizachyrium scoparium, and Calamovilfa arcuata. Other common herbaceous species include Andropogon gerardii, Symphyotrichum dumosum (= Aster dumosus) (riverbank form), Baptisia sphaerocarpa, Boltonia diffusa, Coreopsis tripteris, Diodia virginiana, Euphorbia corollata, Conoclinium coelestinum (= Eupatorium coelestinum), Eupatorium serotinum, Ludwigia alternifolia, Panicum rigidulum, Rhexia mariana, Silphium laciniatum, Trachelospermum difforme, Tradescantia ohiensis, Tridens flavus, Tripsacum dactyloides, and others. Commonly occurring woody species include Acer rubrum var. trilobum, Alnus serrulata, Amorpha fruticosa, Amorpha ouachitensis, Betula nigra, Cornus obliqua (= Cornus amomum ssp. obliqua), Diospyros virginiana, Hamamelis vernalis, Hypericum lobocarpum, Hypericum prolificum, Ilex decidua, Ilex vomitoria, Liquidambar styraciflua, Nyssa sylvatica, Platanus occidentalis, and others. Characteristic species of this community include Camassia scilloides, Carex crinita, Ceanothus herbaceus, Cooperia drummondii, Houstonia purpurea, Juncus coriaceus, Liatris squarrosa, Dichanthelium acuminatum var. lindheimeri (= Panicum lindheimeri), Parthenium integrifolium, Physostegia intermedia, Rhynchospora glomerata, Trepocarpus aethusae, and Valerianella radiata. This community is maintained by the scouring of floods in relatively high gradient flashy rivers. Where river size is too small, scouring is not intense enough to remove shrubs which then come to dominate the site. Where the river is too large or becomes low gradient, the plant community shifts to riparian forest vegetation. Hydrological alteration degrades and eliminates this community. |
Comm #12927
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CEGL003937
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accession code: VB.CC.5746.CEGL003937
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12928
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Festuca campestris Herbaceous Vegetation
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accession code: VB.CC.32328.CEGL001627
NOT CURRENTLY ACCEPTED
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Western Ecology Working Group of... |
0
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Comm #12929
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Fagus grandifolia - Acer saccharum - Quercus bicolor - Acer rubrum Flatwoods Forest
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accession code: VB.CC.25112.FAGUSGRANDIFOLI
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Midwestern Ecology Working Group... |
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This community is found in the central midwestern United States and possibly adjacent Canada. Stands occur on flat to undulating till or clay plains with imperfectly to poorly drained and aerated soils. This community is dominated by trees that can be found in both upland and lowland sites. Among the most common are Acer rubrum, Acer saccharum, Fagus grandifolia, Quercus bicolor, Quercus macrocarpa, and Ulmus rubra. Associates include Carya ovata, Carya cordiformis, Celtis occidentalis, Fraxinus pennsylvanica, Liriodendron tulipifera, Quercus rubra, Quercus shumardii, and Ulmus americana. Typical shrub species include Asimina triloba, Euonymus obovata, and Lindera benzoin. The herbaceous layer includes Arisaema triphyllum (= Arisaema atrorubens), Actaea pachypoda, Circaea X intermedia (= Circaea canadensis), Galium spp., and Pilea pumila, among others. |
Comm #12930
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Pinus flexilis / Cercocarpus ledifolius Woodland
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accession code: VB.CC.33233.CEGL000804
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Western Ecology Working Group of... |
0
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