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Comm #6431
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Lemna spp. Western North American Aquatic Vegetation
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accession code: VB.CC.31480.CEGL005450
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Western Ecology Working Group of... |
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This aquatic association of floating vegetation is known to occur throughout western North America. <i>Lemna</i> spp. typically dominate but may be mixed with other plant taxa floating on the water surface. <i>Lemna</i>-dominated aquatic vegetation occupies wetlands that are permanently, semipermanently or seasonally flooded. These small plants may float on the water's surface or become stranded and possibly rooted during drawdown periods. Water chemistry is fresh. The standing water habitat is relatively shallow, generally less than 2-4 m (6.6-13.1 feet) and occurs as ponds, lakes, ditches, stock ponds, and backwater sloughs of river and stream channels. Standing water for much or most of the growing season is characteristic. Depth of the water is of no consequence to floating plants; they occur where the wind pushes them. The composition of examples varies across this wide distributional range. <i>Lemna</i> taxa that may be present in Western North America include <i>Lemna aequinoctialis</i> (southwest only as well as southeast U.S.), <i>Lemna gibba</i> (mostly southwestern U.S. and southward), <i>Lemna minor</i> (widespread across temperate North America), <i>Lemna minuta</i> (widespread across southern U.S.), <i>Lemna trisulca</i> (widespread temperate and boreal, but not southeast U.S.), and <i>Lemna turionifera</i> (widespread temperate and boreal, but not southeast U.S.). Other species present may include <i>Spirodela polyrrhiza</i> (widespread temperate U.S.), <i>Azolla mexicana, Azolla filiculoides, Wolffiella lingulata</i> (rare), <i>Wolffiella oblonga</i> (extreme southwest and southeast U.S.), and <i>Wolffia borealis</i> (west coast temperate and eastern temperate U.S., but not coastal plain), as well as <i>Riccia</i> spp. (aquatic liverworts). <i>Potamogeton</i> spp., <i>Sagittaria</i> spp., or <i>Polygonum</i> spp. may also be present in Rocky Mountain ponds. While these latter species are rooted submerged species, and technically not part of the strictly floating community, they do intermingle. Community composition may change hour to hour, yet the environment (only the top few centimeters of water) is homogeneous. Biomass can be abundant under eutrophic conditions. |
Comm #6432
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Lupinus albifrons Sierran Shrubland
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accession code: VB.CC.33584.CEGL005815
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Western Ecology Working Group of... |
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This shrubland association is currently only known from Yosemite National Park in California, and the following description is based on occurrences there. Additional information will be added as it becomes available. Stands are found at extremely xeric sites at low elevations (460-1430 m [1500-4700 feet]) on the upper, mid, and low portions of southeast- to southwest-facing, undulating and linear, moderately steep to steep slopes. This association generally occurs in very hot, stony sites with a large percent cover of bedrock or large rocks (average 50% bedrock). Soils tend to be poorly developed and very shallow, skeletal, and stony with textures ranging from metamorphic to gneiss parent materials. Drainage is moderately well-drained to rapid. Litter cover and bare soil range from 5-40% cover. Impact from disturbance is low to high and often includes invasion from exotic species. Stands of this shrubland form a sparse canopy 1-2 m tall. The understory herb layer is typically open. <i>Clarkia unguiculata, Collinsia heterophylla, Gilia capitata, Melica californica</i>, and <i>Streptanthus tortuosus</i> are constant. The herb with the highest cover in sample plots is <i>Selaginella hansenii</i>. Generally <i>Lupinus albifrons</i> is the sole shrub, with the exception of occasional light cover of <i>Arctostaphylos viscida</i> or <i>Toxicodendron diversilobum</i>. Average total cover of all species is low (18%). |
Comm #6433
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V.D.2.N
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accession code: VB.CC.368.VD2N
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EcoArt 2002 |
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Comm #6434
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CEGL006238
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accession code: VB.CC.6765.CEGL006238
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #6435
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Annona glabra - Conocarpus erectus / Acrostichum aureum Forest
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accession code: VB.CC.36264.CEGL007617
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Southeastern Ecology Working Gro... |
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Comm #6436
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Ceanothus integerrimus - Arctostaphylos viscida - (Arctostaphylos mewukka) Shrubland
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accession code: VB.CC.33946.CEGL005818
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Western Ecology Working Group of... |
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This shrubland association is currently only known from Yosemite National Park in California, and the following description is based on occurrences there. Additional information will be added as it becomes available. Stands are found at submesic to xeric sites at low to mid elevations (610-1585 [2000-5200 feet]) on the mid to upper portions of south- to north-facing, linear and convex, moderately steep to somewhat steep slopes. Soils are moderately well-drained to well-drained with textures ranging from loamy sand to sandy loam of igneous, metamorphic, and granitic parent materials. Litter is 40-88% cover. Disturbance is common and includes mostly low and sometimes high impact levels from competition from exotics, logging, grazing, and fire. Stands this shrubland range from 60-90% cover and 2-5 m tall. This association forms a continuous shrub layer dominated by <i>Ceanothus integerrimus</i> and significantly less <i>Arctostaphylos viscida</i> and/or <i>Arctostaphylos mewukka</i>. Often found contributing to minor cover is <i>Pinus ponderosa, Bromus tectorum, Cercocarpus montanus var. glaber, Claytonia perfoliata, Vulpia microstachys, Elymus glaucus, Galium aparine</i>, and <i>Madia minima</i>. Occasionally, <i>Quercus garryana var. breweri, Toxicodendron diversilobum</i>, and moss may be common. Other species vary and may include <i>Adenostoma fasciculatum, Aesculus californica, Bromus arenarius, Bromus diandrus, Ceanothus cordulatus, Fragaria vesca, Lepechinia calycina, Potentilla glandulosa, Pteridium aquilinum, Ribes quercetorum</i>, and <i>Staphylea bolanderi</i>. |
Comm #6437
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Prunus emarginata Sierran Chaparral Shrubland
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accession code: VB.CC.33272.CEGL005822
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Western Ecology Working Group of... |
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This shrubland association is currently only known from Yosemite National Park in California, and the following description is based on occurrences there. Additional information will be added as it becomes available. Stands are found at mid elevations (1800-2500 m [5900-8200 feet]) on gentle to somewhat steep slopes (5-24°). This association is found on soils with textures ranging from sand to silt loam derived from granitic parent material. Litter cover at these sites can be high (40-70%). Stands of this shrubland form a continuous shrub layer dominated by <i>Prunus emarginata</i>. <i>Populus tremuloides</i> is occasionally present in the overstory. <i>Prunus andersonii</i> can be common in the shrub layer. The shrub layer may also consist of low amounts of <i>Artemisia tridentata, Ribes roezlii, Purshia tridentata, Cercocarpus ledifolius</i>, and <i>Symphoricarpos rotundifolius var. rotundifolius</i>. The herbaceous layer may include <i>Lupinus latifolius, Apocynum androsaemifolium, Elymus elymoides, Gayophytum ramosissimum, Castilleja applegatei, Carex exserta, Carex hoodii</i>, and <i>Holodiscus discolor</i>. |
Comm #6438
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Pinus flexilis / Festuca campestris Woodland
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accession code: VB.CC.22730.PINUSFLEXILISFE
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Western Ecology Working Group of... |
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Comm #6439
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CEGL001291
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accession code: VB.CC.3877.CEGL001291
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6440
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Abies lasiocarpa - Picea engelmannii / Valeriana sitchensis Woodland
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accession code: VB.CC.32201.CEGL005823
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Western Ecology Working Group of... |
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This association is relatively uncommon in Glacier National Park, Montana, and Waterton Lakes National Park, Alberta. This woodland association occupies moderately steep to steep slopes with northerly to westerly aspects. Stands may be located at low, middle or high positions along mountain slopes. Elevation ranges from 1770-2155 m (5806-7068 feet). The association may develop over talus and scree slopes, on pockets of soil above exposed ridges, or on colluvial deposits that overlie bedrock. Parent material is typically derived from sedimentary siltstone, with evidence present in the form of argillite in surface soils. Soil is poorly developed in most stands and is characterized as a sandy loam. Sites are moderately well-drained to rapidly drained. Ground cover is dominated by litter in most stands, although large and small rock may cover significant surface area in stands that develop on talus and scree. Stands within this association have one of two physiognomic characters. The association may be composed of erect, widely spaced trees, 5-10 m tall, with an upper canopy cover of up to 30% and a sparse subcanopy. The association may also exhibit a shrubby, krummholz growth form, with mature trees ranging in height from 2-5 m and no discernible subcanopy. <i>Abies lasiocarpa</i> and <i>Picea engelmannii</i> are the most common species in both the upper and subcanopy. <i>Pinus contorta</i> may be well-represented in stands impacted by fire within the last 50 years. Shrub cover is sparse. <i>Vaccinium caespitosum</i> may be well-represented in stands positioned in frost pockets or with cold-air drainage. Herbaceous cover ranges from 40-90%. Common forbs with at least 10% cover include <i>Arnica latifolia, Valeriana sitchensis</i>, and <i>Thalictrum occidentale</i>. <i>Pedicularis bracteosa</i> may have high cover (near 30%) in some stands. |
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