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Name
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Reference
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Description |
Comm #6771
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Salix arctica - (Salix petrophila, Salix nivalis) / Polygonum bistortoides Dwarf-shrubland
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accession code: VB.CC.31941.CEGL001431
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Western Ecology Working Group of... |
0
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This dwarf-shrub alpine association is known from the Rocky Mountains of Alberta, Montana and Wyoming. It occurs primarily as small patches, from the uppermost subalpine to the highest alpine elevations, from 1980 to 3231 m (6495-10,600 feet). It is mainly associated with receiving positions, toeslopes and lower to midslopes of gentle terrain. It occurs in mesic areas with slopes that range from flat to moderate (up to 50% grade), with all aspects represented. The type occurs predominantly in small, visually salient patches that appear as a continuous blanket of green due to high coverage of both the vascular and bryophyte components. The dwarf-shrub layer is commonly dominated by <i>Salix arctica, Salix petrophila</i>, or <i>Salix nivalis</i>. <i>Dryas octopetala</i> may be present or absent in the dwarf-shrub layer with up to 20% cover. Graminoids are present in all stands but are neither diverse nor in high quantities. Common species include <i>Poa alpina</i> and moist-site <i>Carex</i> spp. (<i>Carex albonigra, Carex phaeocephala</i>, and <i>Carex nova</i>). The herbaceous layer is dominated by forbs, most notably <i>Polygonum bistortoides</i>, but other forbs, including <i>Polygonum viviparum, Geum rossii, Potentilla diversifolia, Oreostemma alpigenum (= Aster alpigenus), Solidago multiradiata</i>, and <i>Claytonia lanceolata</i>, are often codominant. Other common species include <i>Astragalus kentrophyta, Phlox pulvinata, Tetraneuris grandiflora, Arenaria congesta, Oxytropis deflexa</i>, and <i>Castilleja</i> spp. <i>Picea engelmannii</i> seedlings may be present. This association most often grades to moist turf types or unequivocal snowbed communities (e.g., <i>~Carex nigricans</i> Herbaceous Vegetation (CEGL001816)$$) or wet meadows (e.g., <i>~Deschampsia caespitosa - Caltha leptosepala</i> Herbaceous Vegetation (CEGL001882)$$). Most other dwarf-shrub <i>Salix</i> spp.-dominated types occur on yet wetter sites; therefore, they should be recognized first in working keys. |
Comm #6772
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Ailanthus altissima Ruderal Floodplain Forest
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accession code: VB.CC.36419.CEGL007191
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Southeastern Ecology Working Gro... |
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This forest association generally occurs on nutrient-rich substrates, in disturbed situations on slopes, urban abandoned lands, and on rocky limestone slopes, in association with a wide variety of other exotic species and generalist native species. There are floodplain forests in which invasive exotic <i>Ailanthus altissima</i> makes up 25-50% of the canopy; with other associated canopy species of <i>Fraxinus pennsylvanica</i> and <i>Acer saccharinum</i>. At this time, these forests are treated as D-ranked examples of native types. |
Comm #6773
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CEGL008074
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accession code: VB.CC.7608.CEGL008074
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #6774
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Fouquieria splendens / Encelia (farinosa, resinifera) Shrubland
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accession code: VB.CC.31578.CEGL005118
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Western Ecology Working Group of... |
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This ocotillo shrubland association is currently described from Grand Canyon National Park in Arizona. More survey and classification work are needed to fully characterize this type. It primarily occurs on xeric sideslopes at 450 to 825 m (1475-2750 feet) elevation, but has been found as high as 1025 m (3375 feet). It is typically found on moderately sloping gradients (10-30°), across all aspects, but may also occur on gentler or steeper slopes. Soils are well- to rapidly-drained silty or sandy loams, and the underlying geology is usually limestone or occasionally shale. Vegetation is characterized by a tall-shrub layer of <i>Fouquieria splendens</i> and a short-shrub layer of <i>Encelia farinosa</i>. The short-shrub stratum also frequently supports <i>Ephedra fasciculata</i> and <i>Ferocactus cylindraceus</i>, and occasionally <i>Opuntia acanthocarpa</i> and <i>Krameria erecta</i>. <i>Opuntia basilaris</i> regularly occurs in a sparse dwarf-shrub layer. <i>Bromus rubens</i> (exotic), <i>Dasyochloa pulchella</i>, and <i>Vulpia octoflora</i> commonly occur in the sparse graminoid understory. Forb composition varies among stands; however, <i>Eriogonum inflatum, Sphaeralcea grossulariifolia, Cryptantha</i> spp., and <i>Stylocline micropoides</i> are among the most frequent forbs. |
Comm #6775
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Schoenoplectus spp. - Poa palustris - Mixed Herbaceous Great Plains Streamside Marsh
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accession code: urn:lsid:vegbank.org:commConcept:34026-{8EBD38DD-F058-4AC7-9D24-513FF37A2420}
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NatureServe Biotics 2019 |
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This western Great Plains streamside marsh lines perennial streams at lower to mid elevations in the Black Hills of the United States, and perhaps more widely in the northern Great Plains. Species composition is variable, and dominance is patchy within stands. Local dominants include <i>Agrostis stolonifera, Glyceria grandis, Poa palustris, Scirpus pallidus, Eleocharis palustris, Leersia oryzoides, Lycopus asper, Cicuta douglasii</i>, and <i>Nasturtium officinale</i>. <i>Ranunculus longirostris</i> can be abundant in adjacent shallow water. <i>Catabrosa aquatica, Mimulus guttatus</i>, and several species of <i>Veronica</i> and <i>Epilobium</i> commonly grow in adjacent shallow water. This type is undersurveyed and not well-characterized. It typically forms a narrow border, perhaps only a few m wide, along streams, and this scale may be too fine for recognition as an association. |
Comm #6776
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Pinus banksiana - Thuja occidentalis - Picea glauca / Juniperus communis Woodland
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accession code: VB.CC.36902.CEGL005126
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Midwestern Ecology Working Group... |
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The mixed conifer / common juniper alvar woodland type occurs scattered through the Great Lakes region in the United States and Canada, from southern Ontario and northern Michigan, to northern New York. Stands occur on shallow soils over flat limestone or dolostone outcrops (pavements). The trees form a partial canopy with 25-60% cover. The tree canopy consists of a variable mixture of <i>Picea glauca, Thuja occidentalis, Pinus banksiana, Abies balsamea</i>, and <i>Pinus strobus</i>. The understory of this woodland is a mosaic of shrubby patches, exposed pavement, and grassy patches. The most abundant shrub is <i>Juniperus communis</i>; other characteristic shrubs include <i>Juniperus horizontalis, Shepherdia canadensis</i>, and <i>Arctostaphylos uva-ursi</i>. Characteristic herbs include <i>Isanthus brachiatus (= Trichostema brachiatum), Carex crawei, Packera paupercula (= Senecio pauperculus), Carex eburnea, Carex richardsonii</i>, and <i>Sporobolus vaginiflorus</i>. Areas of exposed limestone or dolostone pavement are common, usually with a cover of mosses such as <i>Tortella</i> spp. and <i>Schistidium</i> spp., lichens such as <i>Cladina rangiferina (= Cladonia rangiferina)</i> and <i>Peltigera canina</i>, and rock surface algae such as <i>Gloeocapsa alpina</i>. This community is closely related to juniper alvar shrubland, and may represent a later successional stage of that community. The main difference between mixed conifer / common juniper alvar woodland and juniper alvar grassland is the higher cover of trees (over 5 m tall) in the mixed conifer / common juniper alvar woodland. |
Comm #6777
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Gutierrezia (sarothrae, microcephala) - Ephedra spp. - Agave utahensis Dwarf-shrubland
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accession code: VB.CC.31743.CEGL005130
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Western Ecology Working Group of... |
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This dwarf-shrubland association is currently described from Grand Canyon National Park and Grand Canyon-Parashant National Monument in Arizona. More survey and classification work are needed to fully characterize this type. It typically occurs on sideslopes, but also sometimes occurs in valley bottoms, plateaus, and on ridges, at 750 to 1450 m (2475-4700 feet) elevation, but can be found as high as 1850 m (6075 feet). It is primarily found on moderate to steep gradients (20-40°), but also occasionally occurs on gentler slopes (1-9°), across all aspects, other than north-facing. Soils are well- to rapidly-drained and range from silty or sandy loams to clays. The underlying geology is typically limestone. Trees are essentially lacking in this shrubland association; however, scattered <i>Juniperus osteosperma</i> infrequently occurs in both the canopy and subcanopy layers, and <i>Acacia greggii</i> sporadically occurs in a sparse tall-shrub layer. Vegetation is characterized by the codominance of one of <i>Ephedra viridis, Ephedra fasciculata</i>, or <i>Ephedra torreyana</i>, along with <i>Gutierrezia sarothrae</i> and <i>Agave utahensis</i>. In rare stands in which <i>Gutierrezia sarothrae</i> is not present (typically at lower elevations), <i>Gutierrezia microcephala</i> occurs in its place. The short-shrub layer also sometimes supports <i>Yucca baccata, Encelia farinosa</i>, and <i>Ferocactus cylindraceus</i>. The native bunchgrasses <i>Muhlenbergia porteri</i> and <i>Achnatherum speciosum</i> occasionally occur in the graminoid understory. The exotic <i>Bromus rubens</i> frequently occurs as well. <i>Sphaeralcea grossulariifolia, Artemisia ludoviciana</i>, and <i>Galium stellatum</i> are frequent components of the forb layer. |
Comm #6778
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CEGL000545
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accession code: VB.CC.3155.CEGL000545
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #6779
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Picrothamnus desertorum Shrubland
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accession code: VB.CC.33191.CEGL001452
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Western Ecology Working Group of... |
0
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Comm #6780
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Calamagrostis purpurascens Herbaceous Vegetation
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accession code: VB.CC.19708.CALAMAGROSTISPU
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Western Ecology Working Group of... |
0
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This dry alpine tundra plant association is known from the eastern portion of the North Cascades Range in Washington and British Columbia, and has been reported from California. Small stands of the association occur on moderate to steep, well-drained, rocky south- to west-facing windward slopes at 2225-2610 m (7300-8550 feet) elevation. Relatively low seasonal accumulations of snow melt rapidly. The sites are snow-free by April to early May. Calamagrostis purpurascens occurs with high cover and frequency. Carex scirpoidea, Minuartia obtusiloba, Oxytropis monticola, and Potentilla diversifolia var. diversifolia are prominent species in the floristically rich plant association. |
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