Comm #6879
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Eriogonum brevicaule - Cushion Plants Sparse Vegetation
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accession code: VB.CC.31803.CEGL005319
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Western Ecology Working Group of... |
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This association is only known from Fossil Butte National Monument in southwestern Wyoming. It is a sparse cushion plant community that occupies shallow soils over limestone-derived gravel and bedrock on hillslopes, badland formations, buttes, and ridges. The sites are gentle to steep (3- to 42-degree slopes), occur between 2041 and 2362 m elevation, and are oriented to the south, southwest or west. The unvegetated surface has moderate to high exposure of bare soil, low to moderate cover of small rocks, low cover of large rocks, and sparse cover of litter and downed wood. The vegetation is characterized by sparse cover of the cushion plant <i>Eriogonum brevicaule</i> (<1-10% cover) with a slightly different composition of cushion plants and other xeric species in each stand. Total vegetation cover ranges from less than 1 to 34% in these sparsely to moderately vegetated stands. Scattered short- and dwarf-shrubs may be present, such as <i>Artemisia frigida, Atriplex confertifolia, Chrysothamnus viscidiflorus, Artemisia arbuscula ssp. longiloba</i>, and <i>Krascheninnikovia lanata</i>. The herbaceous layer is dominated by cushion plants with sparse cover of grasses such as <i>Poa secunda, Elymus lanceolatus</i>, and <i>Pseudoroegneria spicata</i>. Other common forbs may include <i>Antennaria dimorpha, Astragalus spatulatus, Astragalus jejunus, Astragalus vexilliflexus, Cryptantha caespitosa, Erigeron nanus, Eriogonum umbellatum, Minuartia nuttallii (= Arenaria nuttallii), Packera cana (= Senecio canus), Phlox hoodii, Physaria acutifolia, Pteryxia terebinthina (= Cymopterus terebinthinus), Physaria condensata, Stenotus acaulis</i>, and <i>Trifolium gymnocarpon</i>. |
Comm #6880
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Bothriochloa barbinodis Herbaceous Vegetation
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accession code: VB.CC.31873.CEGL005323
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Western Ecology Working Group of... |
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This desert grassland association occurs on dry, rocky or sandy slopes and plains. A single plot at Buenos Aires National Wildlife Refuge was reported on the valley floor at 960 m (3160 feet) elevation. Sites are gently sloping. Substrate is well-drained clay. Cover of bare ground is relatively high in sampled stand (60%). The open to moderately dense herbaceous layer is dominated by perennial midgrass <i>Bothriochloa barbinodis</i> with <i>Sporobolus cryptandrus</i> prominent. Scattered shrubs <i>Prosopis velutina</i> and <i>Lycium</i> spp. may be present in low cover. Other species present in low cover include <i>Urochloa arizonica (= Brachiaria arizonica), Chloris virgata, Digitaria californica, Echinopepon wrightii, Eriochloa acuminata, Eriochloa lemmonii</i>, and <i>Panicum hirticaule var. stramineum (= Panicum stramineum)</i>. Exotic grasses <i>Eragrostis curvula</i> and <i>Eragrostis cilianensis</i> are present in the one stand sampled. |
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