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Add/Drop	Name	Reference	Plots↓	Description
Comm #11921	Spartina gracilis Herbaceous Vegetation » more details accession code: VB.CC.32475.CEGL001588	Western Ecology Working Group of...	0	This association has only been described from plots in northern Colorado, Utah and Oregon, but it is likely to occur throughout the western U.S. In Colorado, these wetland meadows occur in small patches in swales and on banks, terraces and overflow channels of gentle-gradient streams and rivers at low to middle elevations. Soils are alkaline, fine-textured silt loams and clay loams. The vegetation is a sparse to thick herbaceous layer of grasses and grasslike plants that is dominated by <i>Spartina gracilis</i>. Other herbaceous species that are known to occur include <i>Equisetum hyemale, Distichlis spicata, Triglochin maritima</i>, and <i>Asclepias speciosa</i>. Deciduous trees and shrubs occur with minimal cover and are usually restricted to the margins of stands. This association requires a seasonally high water table and alkaline soils in order to persist. Information on stands that occur outside Colorado will be added later as it becomes available.
Comm #11922	Sida fallax Coastal Dry Dwarf-shrubland » more details accession code: VB.CC.20820.SIDAFALLAXCOAST	Western Ecology Working Group of...	0
Comm #11923	CEGL002050 » more details accession code: VB.CC.4596.CEGL002050 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #11924	CEGL004772 » more details accession code: VB.CC.6283.CEGL004772 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #11925	Deschampsia caespitosa - Carex nebrascensis Herbaceous Vegetation » more details accession code: VB.CC.33670.CEGL001601 NOT CURRENTLY ACCEPTED	Western Ecology Working Group of...	0	This meadow vegetation grows on moist "bottomland" sites on the Medicine Bow National Forest in southeastern Wyoming, mesic meadows and seeps within meadows in foothills and montane sites within the Great Basin and Sierra Nevada, and in riparian bottoms and wet meadows in central and eastern Oregon. Sites are typically flat with finer-textured soils. Mottles and/or gleying may be present. Codominant species in the vegetation are <i>Deschampsia caespitosa</i> and <i>Carex nebrascensis</i>. Other common species with lower cover include <i>Carex athrostachya, Carex simulata, Juncus balticus, Muhlenbergia filiculmis</i>, and species of moss. In disturbed stands, grazing tolerant exotics <i>Poa pratensis</i> or <i>Poa palustris</i> may be common.
Comm #11926	Festuca idahoensis - Elymus trachycaulus Herbaceous Vegetation » more details accession code: VB.CC.33692.CEGL001614	Western Ecology Working Group of...	0	This grassland occurs in Montana, Wyoming and Colorado on relatively high mountain slopes and alluvial terraces of gentle terrain (4-12%) from 1100- 3322 m (3600-10,900 feet). It occurs in mesic habitats with 45-79 cm (18-31 inches) annual average precipitation. Soils are deep, well-drained loams with a variety of parent materials. Ground cover has 4-13% bare ground, as much as 40% litter, and some nonvascular cover. This is a mesic grassland with low stature (<0.5 m), high species diversity, and a high proportion of forb cover (30-70% cover), more than other western Montana grassland types. <i>Elymus trachycaulus (= Agropyron caninum)</i> and <i>Festuca idahoensis</i> are consistently present, and both are dominant grasses within stands. Other important graminoids include <i>Carex</i> spp., <i>Koeleria macrantha, Danthonia intermedia, Achnatherum occidentale (= Stipa occidentalis), Achnatherum lettermanii, Melica spectabilis, Bromus ciliatus (= Bromus canadensis)</i>, and <i>Poa fendleriana</i>. Usually abundant forbs include <i>Geum triflorum, Potentilla gracilis, Achillea millefolium, Geranium viscosissimum, Agoseris glauca</i>, and <i>Campanula rotundifolia</i>.
Comm #11927	Deschampsia caespitosa - Carex douglasii Herbaceous Vegetation » more details accession code: VB.CC.33672.CEGL001602 NOT CURRENTLY ACCEPTED	Western Ecology Working Group of...	0	This alkaline bottomland association occurs in scattered localities of eastern Oregon. The region is semi-arid, with average annual precipitation varying from 20 to 40 cm in all except the higher elevations in the Blue Mountains, where over 60 cm fall annually. A high proportion of the annual precipitation falls as snow, but winter temperatures are not as extreme as to the east of the Rocky Mountains. It is found in flat, poorly drained floodplains and internally drained basins or historic lake basins (playas). Elevations range from 760 to 1525 m. Soils are alkaline and typically seasonally flooded. This herbaceous association is composed of perennial bunchgrasses and rhizomatous sedges, but little information is available on canopy cover, density or species composition. The perennial bunchgrass <i>Deschampsia caespitosa</i> is probably the dominant grass, and is typically 0.5-1 m tall. <i>Carex</i> species are codominant, the most commonly occurring and indicative species is <i>Carex douglasii</i>, which is rhizomatous and probably forms a matrix of 1- to 3-dm tall culms within the clumps of <i>Deschampsia</i>. The deciduous, succulent-leaved shrub <i>Sarcobatus vermiculatus</i> may occasionally occur in some stands and is typically 1-3 m tall.
Comm #11928	Deschampsia caespitosa - Danthonia californica Herbaceous Vegetation » more details accession code: VB.CC.33862.CEGL001604	Western Ecology Working Group of...	0	This is a moderately tall, bottomland grassland association. It occupies flat, valley bottom landscapes, generally with little topographic relief. Hummocks are common and important in some of the prairies and absent in others. Soils are usually fine-grained pluvial clays, moderately permeable to impermeable, with a high winter and spring water table. Mild, wet winters and hot, dry summers are typical. In its range in western Oregon and Washington, the large pre-settlement extent of the prairie was maintained by annual burning by native Americans. The cessation of burning and the introduction of domestic livestock produced marked changes in these prairies. The dominant species are the tall perennial bunchgrass <i>Deschampsia caespitosa</i> and the shorter rhizomatous perennial <i>Danthonia californica</i>. Other common native graminoid species include <i>Poa secunda, Festuca roemeri (= Festuca idahoensis var. roemeri), Agrostis exarata, Juncus patens, Koeleria macrantha (= Koeleria niditia)</i>, and <i>Carex</i> species. Common native forbs include <i>Camassia quamash, Montia linearis, Symphyotrichum chilense (= Aster chilensis), Delphinium nuttallii ssp. ochroleucum (= Delphinium ochroleucum), Epilobium brachycarpum, Achillea millefolium, Sisyrinchium bellum, Madia</i> spp., and <i>Eriophyllum lanatum</i>. Some areas are characterized by camas blooms in the spring. In low swales which are always found in this type, the species <i>Juncus</i> spp., <i>Hordeum brachyantherum, Beckmannia syzigachne, Alopecurus geniculatus, Eleocharis acicularis</i>, and <i>Veronica scutellata</i> can dominate. Common (often dominant) non-native species in less pristine sites include <i>Holcus lanatus, Bromus japonicus, Poa pratensis, Poa compressa, Agrostis stolonifera, Phleum pratense, Dactylis glomerata, Cynosurus cristatus, Aira caryophyllea, Daucus carota, Hypochaeris radicata, Hypericum perforatum, Rumex acetosella, Geranium dissectum</i>, and <i>Senecio jacobaea</i>. Shrubs include <i>Spiraea douglasii, Rosa gymnocarpa</i> and the non-native <i>Rosa eglanteria</i>.
Comm #11929	Populus deltoides - Salix gooddingii Forest » more details accession code: VB.CC.28124.POPULUSDELTOIDE	Western Ecology Working Group of...	0	This mature riparian forest association is found in the middle Pecos and Rio Grande basins of New Mexico and extreme southwestern Colorado. It occurs along low-gradient rivers of wide lowland valleys at elevations from 990 to 1630 m (3250-5350 feet). Stream gradients are generally low (<1%), and riverbeds tend to be mostly sandy. Gravels and cobbles are more frequent as the gradient increases. Sites typically are elevated sidebars and low terraces that are situated above the active channel (discharge ratios range from 2 to 6). Flooding frequency ranges widely, from as low as every two years on lower bars to more than 50 years on elevated terraces. Soils of young fluvial landforms are poorly developed Entisols. Soils may be coarse-loamy throughout or overlain by a sandy layer. Gravels and cobbles are generally scattered throughout the profile. Soils are dry within 1 m but, upon approaching the groundwater, become moist, particularly during seasonal flooding events. Middle-aged to mature stands of Populus deltoides ssp. wislizeni or Populus deltoides ssp. monilifera and Salix gooddingii form closed canopies (85% or greater cover) that reach heights of 20 to 25 m (65-82 feet). Other deciduous trees are generally absent. Elaeagnus angustifolia and Tamarix ramosissima can become invasive and reproduce in the understory. Smaller cottonwood and willow saplings may be present in the understory, but seedlings are absent. Understory shrub and herbaceous layers are sparse, not well-represented, and low in diversity. There may be scattered Salix exigua or Baccharis spp. and patches of grass, but generally the forest floor is sparse and covered with leaf litter. Six wetland indicator species are known to occur. As a keystone species, the reproduction of Populus deltoides after flooding (and sufficient subsequent base flows) is critical to the sustainability of this community.
Comm #11930	CEGL004779 » more details accession code: VB.CC.6288.CEGL004779 NOT CURRENTLY ACCEPTED	EcoArt 2002	0