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Reference
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Description |
Comm #6451
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Betula glandulosa / Salix brachycarpa Shrubland
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accession code: VB.CC.31773.CEGL005828
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Western Ecology Working Group of... |
0
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Shrublands of this association have only been described from Rocky Mountain National Park in the high subalpine between 3390 and 3460 m (11,120-11,360 feet) elevation. Stands form dense, low thickets and can be found on both slopes and benches where pitch ranges from flat to somewhat steep (0-49%) and aspect is variable. The surficial geology is granite, and soils are sandy loams and loams. Soils are generally well-drained but can also be moderately well-drained and somewhat poorly drained. Large and small rocks and litter and duff comprise significant ground cover. <i>Betula glandulosa</i> and <i>Salix brachycarpa</i> codominate a dense shrub canopy of 60-100% cover in this association. <i>Betula glandulosa</i> typically has slightly higher coverage (30-80%) than <i>Salix brachycarpa</i> (1-60%) and occasionally dominates the stratum. The shrubs grow <0.5 m tall in most stands but can reach 1 m where growing conditions are favorable. In addition to the two dominant shrubs, <i>Artemisia arctica ssp. arctica, Dasiphora fruticosa ssp. floribunda, Juniperus communis</i>, and <i>Salix planifolia</i> can all be found within the shrub layer at low concentrations. This community type often grows at treeline and can contain krummholz <i>Abies lasiocarpa</i> and <i>Picea engelmannii</i> intermixed with the true shrub species. The herbaceous stratum is variable, covering between 5-30%. In some stands the shrub layer grows so dense that little else can grow underneath, while in other stands the herbaceous undergrowth is significant. The most common graminoids include <i>Calamagrostis purpurascens, Carex siccata (= Carex foenea), Carex rupestris var. drummondiana, Festuca brachyphylla ssp. coloradensis</i>, and <i>Trisetum spicatum</i>. The most common forbs include <i>Achillea millefolium var. occidentalis, Campanula</i> spp., <i>Geum rossii var. turbinatum, Minuartia obtusiloba</i>, and <i>Sedum lanceolatum ssp. lanceolatum</i>. |
Comm #6452
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A.1319
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accession code: VB.CC.1091.A1319
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Vegetation types within this alliance are infrequent and are found above timberline in the southern Rocky Mountains. Occurrences are on stabilized, small to medium-sized scree habitats in the alpine zone (3000-3900 m). They typically occur on east-oriented, gently sloping (2-20%) sites. The snow cover lasts well into the summer, providing mesic and cool habitats. Soils are skeletal, thin, typically with rock outcrops. Organic matter content is low. Clay content is high with fine-sized particles. Vegetation types within this alliance are classified as short alpine or subalpine dry bunch grasslands. They are dominated by ~Carex arapahoensis$ that typically shares dominance with ~Minuartia biflora$. Other graminoids can include ~Trisetum spicatum$ and ~Festuca brachyphylla$. The nonvascular stratum is usually present and includes ~Cladonia pyxidata$ and ~Polytrichum piliferum$. Information on adjacent communities is not available. |
Comm #6453
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Picea engelmannii / Salix drummondiana Woodland
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accession code: VB.CC.31847.CEGL005843
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Western Ecology Working Group of... |
0
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This association is uncommon in the montane and lower subalpine zones on the east side of Glacier National Park, Montana, restricted to the edges of lakes and creeks. Stands are located in bottomland floodplains along lakes, ponds, streams, and creeks. These sites occur at low to moderate elevations up to 1525 m (5000 feet) on flat terrain. Soils are variable, ranging from poorly drained, very dark silty clay loam to rapidly drained, very gravelly sand. This variability is due to the location of stands, which occur on sandy creek beds and semipermanently flooded lowlands. Soil is derived from glacio-fluvial deposits and can contain red, green, and tan argillite. Ground cover is variable as well. Litter covers 30-60% of the ground surface, but water may be as high as 20% cover in some areas, while rock and sand may be 50% cover in other areas. This is a subhygric to hydric evergreen woodland that is dominated by <i>Picea engelmannii</i> or <i>Picea engelmannii x glauca</i> hybrids in the overstory and <i>Salix drummondiana</i> in the understory. Tree cover is generally sparse, ranging from 5-20%. Mature <i>Picea engelmannii</i>, measuring 15-20 m, may occur scattered within the dense shrub cover, or medium-sized <i>Picea engelmannii</i>, measuring 5-10 m, may occur with higher cover as more of a woodland. <i>Abies lasiocarpa</i> trees and <i>Picea engelmannii</i> seedlings can also be common. Shrub cover is very high at 60-80%, dominated almost exclusively by <i>Salix drummondiana</i> with heights of 1-2 m. A few other shrubs are present with low cover. Herbaceous cover ranges from 10-30% and is dominated by <i>Calamagrostis canadensis, Elymus glaucus</i>, and <i>Geum macrophyllum</i>. Other high-constancy forbs include <i>Epilobium ciliatum</i> and <i>Galium triflorum</i>. <i>Cicuta douglasii, Carex utriculata, Petasites frigidus var. sagittatus (= Petasites sagittatus)</i>, and <i>Equisetum hyemale</i> may be present with conspicuous cover. Stand age was measured at 45 years in one plot and 95 years in another. |
Comm #6454
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Cephalanthus occidentalis / Polygonum hydropiperoides - Panicum verrucosum Shrubland
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accession code: VB.CC.31104.CEGL006242
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Eastern Ecology Working Group of... |
0
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This pond community is known from the Coastal Plain of Delaware, Maryland, and Virginia (and possibly other states). Examples include seasonally flooded shrublands that occur in relatively small basins that draw down entirely during dry years, exposing some bare substrate by the end of the growing season. The substrate is a shallow organic layer overlying silt loam or clay loam. <i>Cephalanthus occidentalis</i> is the dominant shrub, but <i>Decodon verticillatus</i> may also be present. Characteristic herbs are <i>Panicum verrucosum, Dulichium arundinaceum, Polygonum hydropiperoides, Torreyochloa pallida, Rhexia virginica, Polygonum amphibium, Juncus repens</i>, and <i>Panicum hemitomon</i>. Other associates may include <i>Bidens frondosa, Scirpus cyperinus, Proserpinaca palustris, Triadenum virginicum, Dichanthelium spretum (= Panicum spretum), Scleria reticularis</i>, and <i>Fimbristylis autumnalis</i>. Species composition of this community tends to be variable among occurrences. |
Comm #6455
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Populus tremuloides / Symphoricarpos occidentalis Forest
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accession code: VB.CC.31136.CEGL005848
NOT CURRENTLY ACCEPTED
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Western Ecology Working Group of... |
0
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This forest association is reported from Waterton Lakes National Park in Alberta, Canada. It occupies upland terraced slopes with a gentle to moderate grade. The association is most common at midslope or lower. Aspects vary from southeasterly to easterly. The association was documented at elevations ranging from 1320-1360 m (4330-4461 feet), though it may occasionally be present above or below this narrow band. Parent material is glacio-fluvial, and soils are well-developed. The soil is typically well-drained to moderately well-drained with a silty clay loam texture. Ground cover is primarily litter, but wood and small rock may account for 5-10%. <i>Populus tremuloides</i> forms a uniform layer of trees 5-10 m tall in the upper canopy, with average canopy cover of 60%. <i>Amelanchier alnifolia</i> is the only tall shrub present, but is not abundant. Short-shrub cover ranges from 40-60% and is dominated by <i>Symphoricarpos occidentalis</i>. Average canopy cover for this species is 33%. <i>Spiraea betulifolia</i> and <i>Prunus virginiana</i> are usually well-represented. Cover of herbaceous species is quite variable, ranging from 30-80%, and species diversity is relatively low. <i>Prosartes trachycarpa (= Disporum trachycarpum), Thalictrum occidentale</i>, and <i>Eurybia conspicua (= Aster conspicuus)</i> had 100% constancy in sampled plots, with cover for each species between 8% and 13%. Other herbaceous species that may be present in this association include <i>Chamerion angustifolium, Actaea rubra</i>, and <i>Galium boreale</i>. This type frequently grades to <i>~Populus tremuloides / Calamagrostis canadensis</i> Forest (CEGL000574)$$ on moister (downslope) positions. |
Comm #6456
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Artemisia arbuscula ssp. arbuscula / Poa secunda Shrub Herbaceous Vegetation
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accession code: VB.CC.23894.ARTEMISIAARBUSC
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Western Ecology Working Group of... |
0
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Comm #6457
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Cleome spinosa Herbaceous Vegetation
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accession code: VB.CC.36103.CEGL004908
NOT CURRENTLY ACCEPTED
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Southeastern Ecology Working Gro... |
0
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Disturbed areas, dominated by <i>Cleome spinosa</i>, found in Puerto Rico and possibly other areas in the West Indies. |
Comm #6458
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CEGL003806
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accession code: VB.CC.5656.CEGL003806
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6459
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CEGL003991
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accession code: VB.CC.5784.CEGL003991
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6460
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Alnus rubra / Oxalis (oregana, trilliifolia) Forest
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accession code: VB.CC.25974.ALNUSRUBRAOXALI
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Western Ecology Working Group of... |
0
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