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Name
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Reference
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Description |
Comm #12961
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Quercus (dumosa, dunnii, turbinella, wislizeni) Shrubland [Placeholder]
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accession code: VB.CC.23480.QUERCUSDUMOSADU
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Western Ecology Working Group of... |
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Comm #12962
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Pseudotsuga menziesii / Betula occidentalis Woodland
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accession code: VB.CC.32941.CEGL002639
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Western Ecology Working Group of... |
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This woodland association occurs in cool, narrow foothill canyons of the Colorado Front Range between 2015 and 2500 m (6600-8080 feet) elevation in the upper Arkansas and South Platte river basins and in Rio Grande National Forest. It has also been documented from box canyons in southeastern Utah at 1883 m (6175 feet) and may also occur in Nevada. Vegetation is limited to a narrow band along small, steep perennial streams in fairly shallow (165-343 cm [65-135 inches]), loamy alluvial soils, often with a high cover of surface rock. <i>Pseudotsuga menziesii</i> (15-50% cover) trees up to 35 m tall and <i>Betula occidentalis</i> (20-40% cover) are key indicators even if other tree and shrub species are present. Other tree species may include <i>Acer negundo, Salix amygdaloides, Populus angustifolia, Populus tremuloides, Juniperus scopulorum, Pinus ponderosa, Abies concolor, Abies lasiocarpa</i>, or <i>Picea pungens</i>. The shrub canopy may be thick and diverse and include <i>Alnus incana, Acer glabrum, Ericameria nauseosa, Quercus gambelii, Rhus trilobata, Salix bebbiana, Salix ligulifolia (= Salix eriocephala var. ligulifolia), Salix monticola, Salix irrorata, Rosa woodsii, Jamesia americana</i>, and <i>Cornus sericea</i>. The herbaceous layer is generally sparse due to heavy shade; more abundant species include <i>Maianthemum stellatum, Eurybia glauca (= Aster glaucodes), Equisetum arvense, Equisetum hyemale, Carex disperma</i>, and <i>Melilotus officinalis</i>. |
Comm #12963
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Tsuga mertensiana - Abies amabilis Giant Forest Alliance
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accession code: VB.CC.18115.TSUGAMERTENSIAN
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Western Ecology Working Group of... |
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This giant forest alliance occurs in cold, snowy subalpine environments of high coastal mountains from Washington and British Columbia, but probably also occurs northward. Stands occur from 1000-1500 m in elevation, primarily west of the Cascade crest where maritime climate influence is strong and deep winter snowpacks are typical. Precipitation ranges from 150-400 cm annually, falling largely as snow, and snowpacks usually linger into June or later. These forests typically occur in protected habitats in upper montane or subalpine areas and have attained great age due to low fire and windthrow frequency. Sites are cold and moist, and found on mid to lower slopes, benches and bottoms with typically western and northern aspects. Substrates are moderately deep soils derived from colluvium, glacial outwash and volcanic ash, which overlie gneiss or schist. Soils are acidic, coarse-textured and often subirrigated, with a substantial organic component. These forests have a closed tree canopy over 50 m tall that is dominated by Tsuga mertensiana and Abies amabilis. Stands are typically old-growth with multi-layered canopies and copious woody debris. Other common trees include Tsuga heterophylla, Chamaecyparis nootkatensis and Pseudotsuga menziesii. The undergrowth is often somewhat depauperate because of poor light penetration at the forest floor, but may include a moderately sparse shrub layer composed of Rubus spp., Menziesia ferruginea, Vaccinium membranaceum, and Vaccinium ovalifolium. Shade-tolerant forbs and ferns, including Tiarella trifoliata var. unifoliata, Clintonia uniflora, Streptopus lanceolatus var. curvipes (= Streptopus roseus), Valeriana sitchensis, Gymnocarpium dryopteris, and Athyrium filix-femina, dominate the moderately sparse herbaceous layer. Diagnostic of this forest alliance is an upper tree canopy over 50 m tall that is dominated by Tsuga mertensiana and Abies amabilis. |
Comm #12964
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CEGL000719
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accession code: VB.CC.3324.CEGL000719
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #12965
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CEGL000720
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accession code: VB.CC.3325.CEGL000720
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12966
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A.1289
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accession code: VB.CC.1058.A1289
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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This once-extensive bunchgrass alliance grows from California's valleys and foothills south into Baja California, Mexico. It grows on deep soils with a high clay content. Stands can occur on all topographic positions, but due to climatic factors, they do not occur over 1300 m of elevation. The native California bunch grasses are adapted to a Mediterranean climate with moist, cool winters and long, dry summers. Precipitation varies from 25-70 cm per year, and falls mostly between November and April. This temperate or subpolar, medium-tall bunch grassland forms an open canopy less than 1 m in height, and is dominated by ~Nassella pulchra$. Other graminoids present may include ~Elymus glaucus, Festuca californica, Melica californica, Nassella lepida, Nassella cernua, Melica imperfecta, Koeleria macrantha$, and ~Poa secunda$. Many exotic annuals, such as ~Bromus diandrus, Bromus madritensis, Bromus hordeaceus, Avena barbata, Avena fatua$, and ~Lolium perenne ssp. multiflorum (= Lolium multiflorum)$, have invaded stands of this alliance. Emergent trees and shrubs may be present. Plant cover tends to be open. |
Comm #12967
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Acer negundo - Fraxinus velutina Woodland
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accession code: VB.CC.28106.ACERNEGUNDOFRAX
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Western Ecology Working Group of... |
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This woodland association is found in the Organ Mountains in south-central New Mexico and is likely to be found elsewhere in southern New Mexico and Arizona. This type is known to occur at mid-elevations around 3000 m (7400 feet), along rocky channels of moderate gradient (2-3%). It is a closed-canopy forested wetland dominated by Acer negundo with Fraxinus velutina as a subdominant in the canopy. The abundant shrub understory includes Symphoricarpos oreophilus, Ribes montigenum, Ptelea trifoliata, and Brickellia grandiflora. |
Comm #12968
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CEGL000726
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accession code: VB.CC.3331.CEGL000726
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #12969
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Pinus ponderosa - Pseudotsuga menziesii / Arctostaphylos patula Woodland
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accession code: VB.CC.23636.PINUSPONDEROSAP
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Western Ecology Working Group of... |
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This association grows on southeastern to western aspects in the Siskiyou Mountains between 1350-1645 m of elevation. Stands are found on moderate to steep slopes, from midslope to ridgetops. Soils are metavolcanics, schists, granodiorite and peridotite. Pinus ponderosa and Pseudotsuga menziesii are the dominant trees in the overstory with average covers of 35% and 16%, respectively. Pinus lambertiana and Calocedrus decurrens are also present but at lower cover values. The shrub layer averages 65% total cover, with Arctostaphylos nevadensis being the most constant. Arctostaphylos patula occurs near or within stands of this type. Forb and grass cover totals 40%. |
Comm #12970
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Pouteria sandwicensis - Pittosporum confertiflorum - Diospyros sandwicensis Forest
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accession code: VB.CC.19500.POUTERIASANDWIC
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Western Ecology Working Group of... |
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