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Description |
Comm #5251
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Ostrya knowltonii Woodland
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accession code: VB.CC.31646.CEGL003971
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Western Ecology Working Group of... |
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This woodland association is known from a single occurrence in Glen Canyon National Recreation Area from an intermittently flooded alcove on a wash bottom. The site is a moderate slope oriented to the west at 1603 m elevation. Litter and exposed soil cover most of the unvegetated surface, with lesser cover by sand, bedrock and dead wood. The soil is a rapidly drained loamy sand derived from alluvium. This riparian woodland is rare within the recreation area. Total vegetation cover is 92%. The stand is characterized by a dense canopy of the tall shrub <i>Ostrya knowltonii</i> with up to 40% cover. Scattered <i>Populus fremontii, Pinus edulis</i>, and <i>Juniperus osteosperma</i> emerge from the shrub canopy but do not constitute a tree layer. Associated shrubs include <i>Amelanchier utahensis, Fraxinus anomala, Rhus trilobata, Symphoricarpos longiflorus</i>, and <i>Yucca angustissima</i>. The riparian vine <i>Clematis ligusticifolia</i> provides sparse cover. The herbaceous layer is diverse and provides significant cover. Common grasses include <i>Sporobolus airoides</i> and <i>Poa fendleriana</i>. The forbs <i>Solidago canadensis</i> and <i>Heterotheca villosa</i> provide low to moderate cover, and <i>Aquilegia micrantha, Cirsium calcareum, Thelypodium integrifolium</i>, and <i>Castilleja linariifolia</i> are generally present. |
Comm #5252
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A.1697
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accession code: VB.CC.1445.A1697
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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This alliance includes herbaceous seepage communities that develop on the shores of larger rivers, where flood scouring maintains semi-open conditions and groundwater discharge supports a fen-like aspect. Shore substrate may be sandy, gravelly, or bedrock. Characteristic species include ~Triantha glutinosa (= Tofieldia glutinosa), Spiranthes$ spp., ~Parnassia glauca$, and ~Carex hassei$. Communities in this alliance are referred to locally as 'riverside seeps' and 'calcareous riverside seeps.' |
Comm #5253
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Eleocharis cellulosa - Rhynchospora tracyi / (Algal Periphyton) Herbaceous Vegetation
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accession code: VB.CC.36547.CEGL003973
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Hilsenbeck, C. E., R. H. Hofstet... |
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This flat marsh community of southern Florida is codominated by <i>Eleocharis cellulosa</i> and <i>Rhynchospora tracyi</i>. It is the second most common marsh type in the eastern Everglades where it interfingers with and is successionally related to <i>Cladium mariscus ssp. jamaicense</i> communities. It is found on oolite substrate with shallow marly soils which tend to be exposed by peat fires. This type has a 6- to 10-month hydroperiod. <i>Eleocharis cellulosa</i> and <i>Rhynchospora tracyi</i> are dominants (in highly variable ratios), with scattered other species, including <i>Rhynchospora inundata, Eleocharis elongata, Hymenocallis latifolia, Crinum americanum, Bacopa caroliniana</i>, and <i>Utricularia gibba (= Utricularia biflora)</i>. Other species which may be found in some examples include <i>Utricularia purpurea, Utricularia foliosa, Chara</i> sp., <i>Paspalidium geminatum var. paludivagum (= Panicum paludivagum), Hymenocallis palmeri</i>, and <i>Justicia ovata</i>. Algal periphyton may be present. |
Comm #5254
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Leucopoa kingii Herbaceous Vegetation
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accession code: VB.CC.33167.CEGL001910
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Western Ecology Working Group of... |
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Comm #5255
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CEGL003870
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accession code: VB.CC.5699.CEGL003870
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #5256
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CEGL003597
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accession code: VB.CC.5554.CEGL003597
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #5257
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CEGL004796
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accession code: VB.CC.6304.CEGL004796
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #5258
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CEGL004797
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accession code: VB.CC.6305.CEGL004797
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #5259
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Piedmont Mafic Cliff Sparse Vegetation
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accession code: VB.CC.35727.CEGL003982
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Southeastern Ecology Working Gro... |
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This sparsely vegetated cliff association occurs in the Piedmont of the southeastern United States. Examples are found on steep to vertical outcrops of mafic igneous or metamorphic rocks, in topographically low settings such as river bluffs that are not subject to flood scouring. Substrates include gabbro, amphibolite, greenstone, basalt, and sometimes andesite and diorite. Vegetation is low in cover, and is confined to lichens and plants growing on bare rock and to sparse herbs, shrubs, and trees rooted in local pockets of deeper soil. The flora is a mix that usually includes drought-tolerant, shade-intolerant species, species shared with surrounding forests, and sometimes local occurrences of wetland species associated with small seepage zones. Most of the species are acid-tolerant, but several more basophilic species are present. Frequent basophilic species include <i>Aquilegia canadensis, Sanguinaria canadensis, Arabis</i> spp., <i>Anemone berlandieri, Aristolochia serpentaria, Rhus aromatica</i>, and <i>Hydrangea arborescens</i>. Other frequent herbs include <i>Danthonia spicata, Schizachyrium scoparium, Hieracium venosum, Asplenium platyneuron, Pleopeltis polypodioides (= Polypodium polypodioides), Opuntia humifusa, Tephrosia virginiana, Cheilanthes lanosa</i>, and <i>Cheilanthes tomentosa</i>. Frequent woody species include <i>Juniperus virginiana, Carya glabra, Ulmus alata, Chionanthus virginicus</i>, and <i>Ostrya virginiana</i>. Lichens and bryophytes may be abundant or scarce. |
Comm #5260
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Fraxinus americana - Carya ovata / Frangula caroliniana / Helianthus hirsutus Woodland
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accession code: VB.CC.25936.FRAXINUSAMERICA
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Southeastern Ecology Working Gro... |
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This community type is currently known only from a narrow, midslope band of Greenbrier limestone on Little Stone Mountain in Wise County, Virginia. It is an open to very open forest that locally approaches woodland physiognomy. Maximum tree heights are approximately 23 m, but the majority of trees are <20 m in most areas. The mean cover of canopy and subcanopy trees combined is 60-70%. Fraxinus americana, Carya ovata, and Quercus rubra are the most constant and abundant canopy trees. Carya ovalis is a frequent canopy associate while Acer saccharum var. saccharum and Quercus alba are infrequent but locally important. The former is also present in the 6- to 10-m tall understory stratum, along with Ulmus rubra, Juniperus virginiana var. virginiana, and representatives of the other canopy species. Cercis canadensis var. canadensis generally dominates the shrub layer, with Frangula caroliniana, Cornus florida, and Celtis occidentalis as more-or-less constant and common components. Ostrya virginiana may also be present. Toxicodendron radicans and Parthenocissus quinquefolia are common woody vines that frequently reach into the shrub stratum. The herbaceous layer is variable. Polymnia canadensis is a constant and relatively abundant herb that assumes great dominance over some areas. Diarrhena americana is inconstant but locally dominates bouldery slopes in massive colonies. Constant and characteristic herbs include Agrimonia rostellata, Doellingeria infirma (= Aster infirmus), Symphyotrichum patens var. patens (= Aster patens var. patens), Symphyotrichum undulatum (= Aster undulatus), Brachyelytrum erectum, Bromus pubescens, Desmodium glutinosum, Dichanthelium boscii, Elymus hystrix, Erigeron pulchellus var. pulchellus, Helianthus hirsutus, Helianthus microcephalus, Heuchera longiflora, Lysimachia tonsa, Muhlenbergia sobolifera, Muhlenbergia tenuiflora, Polygonatum biflorum, Packera obovata (= Senecio obovatus), Solidago caesia, Solidago ulmifolia var. ulmifolia, and Zizia aptera. Very locally, on the most xeric and rocky microtopographic positions, tree cover is open enough for light-demanding plants more characteristic of 'barrens' or 'glades' to thrive. Included in this group of localized species are Andropogon gerardii, Oligoneuron rigidum var. rigidum (= Solidago rigida ssp. rigida), Liatris aspera var. intermedia, Blephilia ciliata, Polygonum scandens var. cristatum, and Solidago speciosa var. speciosa. This community type is currently known only from a narrow, midslope band of Greenbrier limestone on the south flank of Little Stone Mountain, just northeast of Big Stone Gap in Wise County, Virginia. The stand and associated limestone outcrops extend for more than 2 km and cover at least 100 ha (240 acres). Sites are similar to those occupied by Acer saccharum - Quercus muehlenbergii / Cercis canadensis Forest (CEGL006017) but have a higher mean elevation (688 m (2257 feet)), a more south-facing (versus southwest-facing) aspect, and soils with much higher mean calcium levels (mean = 3523 ppm). Soil moisture regime is subxeric, and habitats have high surficial cover of bedrock outcrops, boulders, and stones (mean cover of all three classes combined = 39%). |
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