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Reference
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Description |
Comm #12251
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Muhlenbergia pungens Herbaceous Vegetation
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accession code: VB.CC.31987.CEGL002363
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Western Ecology Working Group of... |
0
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This somewhat rare association occurs locally on sandy flats and dunes in southern Utah and northwestern Colorado. It is dependent on a certain degree of disturbance to maintain the mid-seral species <i>Muhlenbergia pungens</i>. Elevations range from 1646 to 2256 m (5400-7400 feet), and slopes are flat to gentle. Soils are sands derived from local sandstone, eolian sands or alluvium. In areas protected from grazing, the unvegetated ground surface supports cryptobiotic crusts; in disturbed areas, bare ground cover is high. Total vegetation cover is somewhat sparse, rarely exceeding 50% and usually closer to 25%. <i>Muhlenbergia pungens</i> is the dominant or codominant grass, although other grasses may be important in terms of cover, including <i>Bouteloua gracilis, Achnatherum hymenoides, Sporobolus cryptandrus</i>, and <i>Aristida purpurea</i>. At Zion National Park, the community is codominated by montane grasses such as <i>Muhlenbergia montana</i> and <i>Poa fendleriana</i>. Forbs are diverse but contribute little total cover and vary widely among sites. <i>Machaeranthera canescens, Senecio spartioides</i>, and <i>Heterotheca villosa</i> are among the more common species. Scattered shrubs, such as <i>Atriplex confertifolia, Gutierrezia sarothrae</i>, and <i>Opuntia</i> spp., are often present but do not total more than 10% cover. |
Comm #12252
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Pinus edulis - Juniperus osteosperma / Achnatherum hymenoides Woodland
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accession code: VB.CC.31976.CEGL002364
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Western Ecology Working Group of... |
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This woodland association currently is documented from Canyonlands and Capitol Reef national parks in southeastern Utah. It occurs on basin floors, canyon bottoms, channels, and hillslopes. Sites are gentle (up to 4%), occur between 1506 and 1860 m (4946-6100 feet) elevation, and are oriented to southwestern and northwestern aspects. Parent materials include Moenkopi Formation (shale), Cedar Mesa sandstone, new alluvium, outcrops and basalt boulders. Soils are rapidly drained and fine-textured. Total vegetation cover generally does not exceed 50%. The open canopy consists of <i>Pinus edulis</i> and <i>Juniperus osteosperma</i> trees that range in cover from 5 to 50%, with a bunchgrass understory dominated by <i>Achnatherum hymenoides</i> that ranges in cover up to 25%. Shrubs do not have high enough cover to constitute a layer (<5% total cover) but are often present; common species include scattered individuals of <i>Cercocarpus montanus, Ephedra viridis, Artemisia</i> spp., <i>Ericameria nauseosa, Fraxinus anomala, Gutierrezia sarothrae, Amelanchier utahensis, Rhus aromatica</i>, and <i>Opuntia polyacantha</i>. The herbaceous layer is moderate in terms of species diversity and sparse to low in terms of cover. The most conspicuous associated graminoid is <i>Andropogon gerardii</i>. |
Comm #12253
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CEGL000943
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accession code: VB.CC.3545.CEGL000943
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12254
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CEGL005169
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accession code: VB.CC.6501.CEGL005169
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12255
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Saxifraga odontoloma Herbaceous Vegetation
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accession code: VB.CC.24498.SAXIFRAGAODONTO
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Western Ecology Working Group of... |
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Comm #12256
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Pinus edulis - Juniperus osteosperma / Artemisia pygmaea Woodland
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accession code: VB.CC.32035.CEGL002365
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Western Ecology Working Group of... |
0
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This woodland association has only been described from Capitol Reef National Park. This summary is derived from plot data collected in the park in 1986, 2003 and 2004. It occurs on benches and on canyon rims. Sites slope gently (less than 7%) to the north or east between 1749 and 2134 m elevation. Gravel covers most of the unvegetated surface. Parent materials are variable and include Carmel and Moenkopi shales and pediment deposits. Soils are rapidly drained silty clays and loams. Total vegetation cover ranges widely, from 17 to 110%. The vegetation is characterized by an open canopy, typically 2-10 m tall, of <i>Pinus edulis</i> and <i>Juniperus osteosperma</i> that contribute up to 35% cover, and the dwarf-shrub <i>Artemisia pygmaea</i> with 5 to 15% cover. Sapling <i>Pinus edulis</i> and <i>Juniperus osteosperma</i> are generally present. The shrub layer also includes <i>Eriogonum corymbosum</i> and <i>Shepherdia rotundifolia</i>. The herbaceous layer is moderately diverse in terms of species composition and provides sparse to low cover. Common perennial grasses include <i>Achnatherum hymenoides, Aristida purpurea, Bouteloua gracilis</i>, and <i>Pleuraphis jamesii</i>. Forbs typically provide less than 1% total cover with no consistent species. |
Comm #12257
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Cenchrus myosuroides Herbaceous Vegetation
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accession code: VB.CC.36057.CEGL007651
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Southeastern Ecology Working Gro... |
0
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Maritime grasslands dominated by <i>Cenchrus myosuroides</i>, occurring in southwestern Puerto Rico. |
Comm #12258
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Leptochloopsis virgata Herbaceous Vegetation
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accession code: VB.CC.36510.CEGL007652
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Areces-Mallea, A. E., A. S. Weak... |
0
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Tall bunch grasslands dominated by <i>Leptochloopsis virgata</i>. |
Comm #12259
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CEGL002755
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accession code: VB.CC.5136.CEGL002755
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12260
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CEGL001341
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accession code: VB.CC.3927.CEGL001341
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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