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Add/Drop	Name	Reference	Plots↓	Description
Comm #1921	Populus deltoides / Pascopyrum smithii - Panicum obtusum Woodland » more details accession code: VB.CC.29376.POPULUSDELTOIDE	Carsey et al 2003b	7	The Populus deltoides/Pascopyrum smithii-Panicum obtusum (plains cottonwood/western wheatgrass-vine mesquite) riparian woodland occurs on silty clay soils along rivers and streams of the eastern Colorado plains. The cottonwood trees are large and create an near-continuous overhead canopy. High quality stands have few shrubs, creating an open, park-like structure. Unfortunately, Tamarix ramosissima (tamarisk) has become a thick subcanopy in many stands along the lower Arkansas and Purgatory Rivers in Colorado.
Comm #1922	Cercocarpus montanus – Ceanothus cuneatus Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28857-{BFAC410D-0FC1-4564-BAF3-52666B75D98D} NOT CURRENTLY ACCEPTED	Northern Sierra Nevada Foothills Report	7
Comm #1923	Nassella pulchra Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28779-{C20F0FF0-C347-434D-B9B3-D62CDEBD4457} NOT CURRENTLY ACCEPTED	MCV2	7
Comm #1924	Quercus kelloggii / Arctostaphylos viscida Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28836-{B62405B9-812D-4310-A470-B251C4815DB1} NOT CURRENTLY ACCEPTED	MCV2	7
Comm #1925	Quercus chrysolepis – Quercus kelloggii – Acer macrophyllum Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28820-{599B52C6-0831-4B37-9385-597A2CE4CCAF} NOT CURRENTLY ACCEPTED	Northern Sierra Nevada Foothills Report	7
Comm #1926	Pascopyrum smithii Herbaceous Alliance » more details accession code: VB.CC.19063.PASCOPYRUMSMITH	Midwestern Ecology Working Group...	7	This alliance is common and widespread in the Great Plains, especially the northern portions, and parts of the intermountain western U.S. and possibly Canada. The communities in it range from dry or dry-mesic to wet-mesic. Mid grasses are the dominant vegetation in most communities, although short grasses and sedges can be codominant. The vegetation tends to be denser where the mid grasses are predominant and more open where shorter graminoids are abundant. The mid grasses grow to 0.5-1.0 m on favorable sites, while the short grasses and sedges are less than 0.5 m tall. The most abundant midgrass is Pascopyrum smithii. Common associates include Hesperostipa comata (= Stipa comata), Nassella viridula, Koeleria macrantha, Schizachyrium scoparium, Hesperostipa spartea (= Stipa spartea), and Poa spp. In the drier communities of this alliance Bouteloua gracilis is the most common shortgrass. Other short graminoids typically found in the drier communities include Carex inops ssp. heliophila, Carex duriuscula (= Carex eleocharis), Carex filifolia, and Bouteloua curtipendula (in the northern portion of this alliance's range), Aristida purpurea, and Buchloe dactyloides (in the southern half of this alliance's range). In the wetter communities within this alliance, Distichlis spicata, Hordeum jubatum, Elymus trachycaulus, and Iva annua are common. Forbs and shrubs are generally minor components of communities within this alliance. If shrubs are present they are rarely taller than 1 m. Some forbs that are usually scattered about are Gaura coccinea, Sphaeralcea coccinea, Amorpha canescens, Astragalus spp., and Tragopogon dubius. Shrubs include Symphoricarpos occidentalis, Artemisia cana, Artemisia frigida, and Opuntia spp. Communities within this alliance occur on several different soil types. The soil is most often clay or clay loam, however. it can be loam or sandy loam. In the east and central part of this alliance's range, these communities can be found on flat or rolling uplands, hillslopes, or along streams or depressions. In the western part of this alliance's range, its communities are found where local conditions are wetter than the average. This includes such areas as the base of slopes or along rivers or streams.
Comm #1927	Needle-and-Thread Bunch Herbaceous Alliance » more details accession code: VB.cc.30484.NEEDLEANDTHREAD	NVC 2004	7
Comm #1928	Pseudotsuga menziesii / Symphoricarpos albus Forest » more details accession code: urn:lsid:vegbank.org:commConcept:29368-{D2D55429-82C1-46D3-AB4F-C1A96DC7C5AE}	NatureServe Biotics 2019	7	This widespread forest association occurs in the central and northern Rocky Mountains from the mid montane zone down to upper foothill zone on cool aspects. Sites are warm and relatively dry to moist, gentle to steep, mid to lower slopes, benches, and terraces. Stands are found on southerly or easterly aspects throughout much of its range, but may occur on any aspect. Substrates are variable and may be very gravelly or not, with soil textures ranging from sandy loam to silt derived from alluvium, glacial till and outwash. Ground surface has high cover of litter, sometimes significant cover of rock, and low cover of bare soil. The vegetation is characterized by a moderately dense to dense (40-90% cover) evergreen needle-leaved tree canopy, dominated or codominated by <i>Pseudotsuga menziesii</i> with the short shrub <i>Symphoricarpos albus</i> dominating or codominating the understory. Mature <i>Pinus ponderosa</i> often codominates the tree canopy, but does not regenerate. Other mature seral tree species present to codominant may include <i>Pinus contorta, Pinus flexilis, Larix occidentalis, Juniperus</i> spp., or <i>Populus tremuloides</i>. Understory trees are almost exclusively <i>Pseudotsuga menziesii</i>. The short-shrub layer is dominated or codominated by the rhizomatous <i>Symphoricarpos albus</i> and other short shrubs such as <i>Juniperus communis, Mahonia repens, Paxistima myrsinites, Ribes cereum, Rosa</i> spp., <i>Spiraea betulifolia</i>, and <i>Symphoricarpos oreophilus</i>. Scattered tall shrubs such as <i>Amelanchier alnifolia, Prunus virginiana</i>, or <i>Sorbus scopulina</i> may form an open tall-shrub layer. A low cover to moderately dense herbaceous layer is present and is composed of diverse forbs with the graminoids <i>Calamagrostis rubescens, Carex geyeri, Festuca idahoensis</i> or <i>Pseudoroegneria spicata</i> present to codominant.
Comm #1929	Festuca campestris - Festuca idahoensis Herbaceous Vegetation » more details accession code: urn:lsid:vegbank.org:commConcept:30537-{0970651F-84AD-4BFD-88BE-A2CAE296DF37}	NatureServe Biotics 2019	7
Comm #1930	Populus tremuloides / Betula occidentalis Riparian Forest » more details accession code: urn:lsid:vegbank.org:commConcept:31558-{546C3427-B33C-45C0-86A8-A8A53AEF370C}	NatureServe Biotics 2019	7	This plant association of Colorado and eastern Nevada is a lush, deciduous riparian woodland with a canopy of aspen and sometimes conifer or cottonwood trees. The understory has a high structural diversity of mesic shrubs and an herbaceous undergrowth ranging from a thick carpet of grasses and forbs to a very sparse ground cover in heavily shaded areas. The streamside location and the presence of obligate riparian shrub species, such as <i>Betula occidentalis, Salix exigua</i>, and <i>Cornus sericea</i>, distinguish this association from upland <i>Populus tremuloides</i> communities.