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Description |
Comm #11231
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Panicum virgatum - (Pascopyrum smithii) Herbaceous Vegetation
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accession code: VB.CC.33571.CEGL001484
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Western Ecology Working Group of... |
0
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In Badlands National Park, South Dakota, the switchgrass grassland type contains dense ground cover, typically between 50 and 80%. <i>Panicum virgatum</i> is the dominant species in more mesic areas. <i>Pascopyrum smithii</i> is more abundant on elevated sites within the drainages and basins, and <i>Schizachyrium scoparium</i> is the dominant species along the upper margin of the type. Where this type is found in drainages, the distribution often becomes 'patchy' and <i>Calamovilfa longifolia</i> replaces <i>Schizachyrium scoparium</i> on the upper type margin. Commonly associated species include <i>Glycyrrhiza lepidota, Symphyotrichum ericoides (= Aster ericoides)</i>, and occasionally <i>Populus deltoides</i>. <br><br>Switchgrass is a common component of many wetlands and mesic sites, but becomes dominant in wetter parts of drainages and wetland basins. |
Comm #11232
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Juniperus osteosperma / Hesperostipa comata Wooded Herbaceous Vegetation
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accession code: VB.CC.33868.CEGL001489
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Western Ecology Working Group of... |
0
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This plant association is described from the southwestern foothills of the Lemhi Range, Idaho, within the Bitterroot Mountains ecoregional section. The plant association occurs within a region of cool, arid climatic conditions. The average annual precipitation is 25.4-30.5 cm (10-12 inches). The association occurs in lower slope positions, on relatively steep slopes, at 1585 to 2045 m (5200-6700 feet) elevation, on limestone parent materials. Soils are poorly developed, thin and rocky. Little information is available regarding the structure and composition of this association. Stands are characterized by an open woodland structure dominated by <i>Juniperus osteosperma</i>. <i>Hesperostipa comata (= Stipa comata)</i> is abundant in the understory and is the dominant herbaceous species. No additional information is available on species composition of these stands. |
Comm #11233
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Granite - Metamorphic Great Lakes Shore Cliff Sparse Vegetation
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accession code: VB.CC.22772.GRANITEMETAMORP
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Midwestern Ecology Working Group... |
0
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This granite - metamorphic cliff community type is found along the Great Lakes shoreline of the United States and Canada, possibly in Minnesota, Michigan, and Ontario. Stands occur along the lake shore and are exposed to wind, wave, and ice action. Bedrock is composed of granite or metamorphic rock. The vegetation is very sparse. Further information describing this type is needed. |
Comm #11234
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Purshia tridentata / Pseudoroegneria spicata - Leymus cinereus Shrub Herbaceous Vegetation
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accession code: VB.CC.32739.CEGL001497
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Western Ecology Working Group of... |
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This association is reported from sites located on recent, relatively unweathered mafic lava flows of the Great Rift System, within the Snake River Basalt ecoregional section. The plant association occurs in a semi-arid climatic region, on relatively recent mafic volcanic flow substrates. The area has an average annual precipitation of 17 inches, with a peak in winter. Most precipitation occurs as snow. A secondary peak occurs in May. Temperatures are typically hot in summer and cold in winter. The association occurs on slopes of medium-aged and older cinder cones. Sufficient weathering has occurred on these sites so that soil water-holding capacity is great enough to support <i>Purshia tridentata</i>. By comparison, adjacent younger cinder deposits are occupied by <i>~Eriogonum ovalifolium var. depressum</i> Dwarf-shrubland (CEGL001401)$$. <i>Purshia tridentata</i> forms a low and relatively open layer in this shrub herbaceous type. Cover varies from 15-25%. Several other shrub species are commonly present as scattered individuals, including the deciduous <i>Symphoricarpos oreophilus</i> and <i>Ribes cereum</i>, and the evergreen <i>Ericameria nauseosa (= Chrysothamnus nauseosus), Artemisia tridentata ssp. vaseyana</i>, and <i>Eriogonum heracleoides</i>. Total shrub cover rarely exceeds 30%. The perennial bunchgrass <i>Leymus cinereus</i> dominates the visual aspect of the herbaceous layer, with a growth form of large clumps up to 1 m across. The smaller bunchgrass <i>Pseudoroegneria spicata</i> occurs in higher densities than <i>Leymus cinereus</i> in many areas of this vegetation type. Other grasses usually present include <i>Elymus elymoides, Achnatherum thurberianum (= Stipa thurberiana)</i>, and <i>Poa secunda</i>. The perennial forb <i>Pteryxia terebinthina</i> forms a relatively dense understory, especially where grass density is lower. Other common forbs include <i>Balsamorhiza sagittata, Arabis holboellii, Delphinium andersonii, Lithospermum ruderale, Phacelia hastata</i>, and the suffrutescent species <i>Eriogonum umbellatum</i> and <i>Eriogonum ovalifolium</i>. Total cover of the herbaceous layer is not available, but may be as high as 50%. |
Comm #11235
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Rhus glabra / Aristida purpurea var. longiseta Shrub Herbaceous Vegetation
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accession code: VB.CC.33015.CEGL001507
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Western Ecology Working Group of... |
0
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This open shrubland association has been described from river canyons in the Columbia Basin in Washington, and possibly occurs in Idaho and Oregon. Stands are found on sandy alluvial or colluvial soils in the driest and warmest canyon sites, from 250-800 m elevation. Aspects are usually southerly, and slopes are gentle to steep. The soils are highly variable, but typically weakly developed, low in organic matter, and range from shallow and rocky to deep, nearly stone-free profiles. Soil texture is silt loam to sandy loam. This association is dominated by the clonal, broad-leaved deciduous shrub <i>Rhus glabra</i>. This is the only shrub species present and is highly variable in cover and density, ranging from 20% to over 50% cover, and 2 to 4 live stems/square meter. Most stems are 0.6-1 m in height. The moderately dense herbaceous layer is generally 0.5 m in height and is dominated by the perennial bunchgrass <i>Aristida purpurea var. longiseta</i> with over 40% cover. The other perennial bunchgrasses <i>Poa secunda</i> and <i>Pseudoroegneria spicata</i> are minor components, and perennial forbs are infrequent. A cryptogamic layer may be present on better sites with less disturbance, while litter may cover as much as 65% of the ground surface. The association is separated from other <i>Rhus glabra</i>-dominated types by its restricted range of distribution and unusual edaphic conditions. |
Comm #11236
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Aristida purpurea var. longiseta - Sporobolus cryptandrus Herbaceous Vegetation
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accession code: VB.CC.34386.CEGL001515
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Western Ecology Working Group of... |
0
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This grassland community is found in Oregon and Washington, and may occur in Idaho. Stands are found at elevations of 370-460 m (1200-1500 feet) on terraces and alluvial bars associated with the Snake River. Slopes are 5-22% with variable aspects. Soils are silt or sandy loams underlain by gravel and rock. This vegetation is codominated by <i>Sporobolus cryptandrus, Aristida purpurea var. longiseta</i>, and introduced annual <i>Bromus</i> spp. with 15%, 14%, and 36% cover, respectively. Non-native forbs, <i>Hypericum perforatum</i> and <i>Erodium cicutarium</i> are important forbs with 5% and 1% cover, respectively. In the absence of significant livestock use, this community would have increased cover of <i>Sporobolus cryptandrus</i> and <i>Aristida purpurea var. longiseta</i>, and no introduced species. |
Comm #11237
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CEGL003706
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accession code: VB.CC.5602.CEGL003706
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #11238
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Artemisia arbuscula ssp. arbuscula - Purshia tridentata / Pseudoroegneria spicata - Festuca idahoensis Shrub Herbaceous Vegetation
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accession code: VB.CC.34662.CEGL001518
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Western Ecology Working Group of... |
0
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<i>Artemisia arbuscula</i> and <i>Purshia tridentata</i> are the dominant shrubs with <i>Chrysothamnus viscidiflorus</i> and <i>Ericameria nauseosa (= Chrysothamnus nauseosus)</i> being minor components. This association usually occurs on side and toe slopes on north, northeastern and eastern aspects at elevations from 1370 to 1525 m (4500-5000 feet). Slopes are gently sloping to nearly level, ranging from 0-5%. Bare ground is 50-75% of ground cover. Stones and gravel cover less than 10% of the surface. Soils are moderately well-drained. <i>Pseudoroegneria spicata</i> and <i>Festuca idahoensis</i> are the dominant grasses, with <i>Achnatherum thurberianum, Elymus elymoides, Poa secunda, Koeleria macrantha</i> and the non-native <i>Bromus tectorum</i> commonly found. Important forbs include <i>Astragalus</i> sp., <i>Erigeron</i> sp., and <i>Lomatium triternatum</i>. The <i>Chrysothamnus</i> species and <i>Bromus tectorum</i> increase with grazing intensity. Normally in central Oregon, <i>Purshia tridentata</i> and <i>Artemisia arbuscula</i> would not be growing together since <i>Purshia tridentata</i> requires a considerably deeper and better drained soil than does <i>Artemisia arbuscula</i>. Tests indicate that the two species are growing on distinct microsites. <i>Artemisia arbuscula</i> grows in areas that have a layer restrictive to roots approximately 38.1-50.8 cm (15-20 inches) deep, and <i>Purshia tridentata</i> occurs on sites where this restrictive layer does not occur. The scattered distribution of the two shrubs reflects an underlying distribution of soil condition. Silica has been identified as the major cementing agent that restricts drainage and root penetration on the <i>Artemisia arbuscula</i> sites. |
Comm #11239
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Populus tremuloides - Abies concolor / Arctostaphylos patula Forest
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accession code: VB.CC.24606.POPULUSTREMULOI
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Western Ecology Working Group of... |
0
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Comm #11240
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CEGL000541
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accession code: VB.CC.3151.CEGL000541
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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