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Add/Drop	Name	Reference	Plots↓	Description
Comm #5021	Pinus albicaulis - Abies lasiocarpa / Vaccinium membranaceum / Xerophyllum tenax Woodland » more details accession code: VB.CC.28308.PINUSALBICAULIS	Western Ecology Working Group of...	0	This small- to large-patch type is manifested as a seral type from central Idaho north to northern Idaho, eastern Washington and western Montana (northern Rocky Mountains) and southwestern Alberta (Canadian Rockies), and it very probably will be identified for British Columbia as well. This association is most prominent in west-central and central Montana forests. This association's elevation range is rather broad, ranging from 1030 to 2015 m (3100-6600 feet). It is much more prevalent within the upper elevation range. It occupies primarily south- through west-facing, moderate to steep slopes and is usually found on midslope to slope shoulder positions. It also occurs on benches associated with broad ridges. Soils are well-drained and derived from a broad spectrum of parent materials, including glacial till and drift, both calcareous and noncalcareous sedimentary types, intrusive and extrusive igneous rock and metamorphic types, particularly quartzite. Ground surfaces have little or no bare soil or rock exposed. The canopy structure ranges from moderately open to closed (>60% cover) with Picea engelmannii and Abies lasiocarpa dominant but in which Pinus albicaulis is a significant component (at least 5% canopy cover). These sites often have lesser amounts of Larix occidentalis, Pseudotsuga menziesii, and Pinus contorta. Even should Abies lasiocarpa and Picea engelmannii be minor components of the overstory, they are always major components of the subcanopy. Unthrifty Pinus albicaulis specimens may be members of this layer too, but all indications are that they will not make the canopy (especially given the ubiquity of white pine blister rust). The short-shrub layer dominates the undergrowth with Vaccinium membranaceum being dominant, often exceeding 50% canopy cover; Spiraea betulifolia, Lonicera utahensis, Paxistima myrsinites, Amelanchier alnifolia, and Rosa gymnocarpa are the other high-constancy species of this layer. Dwarf-shrub layer species that occur with consistency include only Vaccinium scoparium and Mahonia repens (= Berberis repens). The herbaceous layer is generally relatively depauperate with the diagnostic species Xerophyllum tenax being strongly dominant (average cover reported by various studies ranging from 25 to 61%). Only two graminoids occur consistently and are well-represented, Calamagrostis rubescens and Carex geyeri. Other forbs with moderate to high constancy include Arnica cordifolia, Arnica latifolia, Chimaphila umbellata, Orthilia secunda (= Pyrola secunda), Thalictrum occidentale, and Viola orbiculata; not all of these forbs have high constancy throughout the range of the type.
Comm #5022	Pinus ponderosa / Alnus incana Woodland » more details accession code: VB.CC.32820.CEGL002638	Western Ecology Working Group of...	0	This coniferous riparian woodland is found along foothill and lower montane canyon bottoms of the southern Rocky Mountains along the Colorado Front Range and may occur in similar habitats in New Mexico and Arizona. Stands occur along rivers and streams on southern aspects that would be too dry for <i>Pinus ponderosa</i>, except for the stream moisture. Sites are flooded for brief periods during the growing season, and the shrubs and trees have access to the water table. Substrates are well-drained, coarse alluvium. Large, mature <i>Pinus ponderosa</i> trees provide an open overstory canopy (25-70% cover) with a narrow band of <i>Alnus incana ssp. tenuifolia</i> (10-30% cover) overhanging the generally narrow and steep stream channel. Older <i>Pinus ponderosa</i> trees are usually rooted in well-drained locations at the top of the streambank or farther from the edge of the channel. <i>Betula occidentalis</i> is usually present (5-35% cover ), as are <i>Prunus virginiana, Salix bebbiana</i>, and <i>Salix ligulifolia (= Salix eriocephala var. ligulifolia)</i>. <i>Toxicodendron rydbergii</i> may also be present. The herbaceous undergrowth is usually sparse because of the droughty soils. Diagnostic of this riparian woodland association is the dominance of <i>Pinus ponderosa</i> in the tree layer with a shrub layer dominated by <i>Alnus incana</i> and other mesic shrubs.
Comm #5023	Quercus virginiana - Carya illinoinensis Woodland » more details accession code: VB.CC.25314.QUERCUSVIRGINIA	Southeastern Ecology Working Gro...	0	This woodland of the upper Coastal Prairie region of Texas occurs within a matrix of coastal grassland. It is characterized by an open, patchy canopy with grass-dominated openings. The overstory is dominated by Quercus virginiana and Carya illinoinensis with lesser amounts of Celtis laevigata var. laevigata, Quercus stellata, and Ulmus alata. The understory typically includes Ilex vomitoria, Crataegus spp., Diospyros virginiana, and Sideroxylon sp. Common herbaceous species include Paspalum plicatulum, Axonopus spp., and Schizachyrium scoparium. This community occurs over heavy-textured, neutral or basic soils on elevated areas within the coastal prairie. It is found in floodplains, but is rarely flooded.
Comm #5024	Impatiens (capensis, pallida) - Monarda didyma Saturated Herbaceous Alliance » more details accession code: VB.CC.27865.IMPATIENSCAPENS	Southeastern Ecology Working Gro...	0	High-elevation, open seeps in the Southern Blue Ridge dominated by tall forbs. This palustrine vegetation occurs as small wetlands at high elevations (greater than 1200 m or 4000 feet), on upper slopes and ridgetops. These areas lack extensive Sphagnum and are typically open, without shading from a forest canopy. Other characteristic species include Aconitum reclinatum, Cardamine clematitis, Carex leptonervia, Carex debilis var. rudgei (= Carex flexuosa), Carex ruthii, Chelone lyonii, Cicuta maculata, Claytonia caroliniana, Conioselinum chinense, Euonymus obovata, Geum geniculatum, Helenium autumnale, Houstonia serpyllifolia, Lilium superbum, Lilium grayi, Packera aurea (= Senecio aureus), Solidago patula, Thalictrum clavatum, Trautvetteria caroliniensis, Veratrum viride, Viola cucullata, and Viola macloskeyi ssp. pallens.
Comm #5025	CEGL004472 » more details accession code: VB.CC.6027.CEGL004472 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #5026	Populus angustifolia - Pseudotsuga menziesii Woodland » more details accession code: VB.CC.32635.CEGL002641	Western Ecology Working Group of...	0	The riparian woodland association is found along small active streams in rocky, cool canyons and valleys between 2000-2700 m in Colorado, Utah, and Nevada. It occurs naturally in small stands on wash bottoms, streambanks, cobble bars and terraces where a northern or protected aspect creates cool micro-environments. A mix of <i>Pseudotsuga menziesii</i> (10-40% cover) and <i>Populus angustifolia</i> (10-60% cover) in the upper canopy is diagnostic, though they may be joined by other conifer species. Shrub cover is typically low, but highly variable and diverse, and may include <i>Acer glabrum, Salix exigua, Alnus incana, Betula occidentalis, Salix lucida ssp. caudata, Clematis ligusticifolia, Ribes cereum</i>, and <i>Quercus gambelii</i>. Herbaceous cover can be sparse and usually limited by heavy shade. This association represents a transition from lower montane to upper montane habitats. Nearly all stands observed have an adjacent north-facing slope with <i>Pseudotsuga menziesii</i> forests. These woodland are dependent upon flooding disturbance for regeneration of <i>Populus angustifolia</i>.
Comm #5027	V.A.8.C » more details accession code: VB.CC.261.VA8C	EcoArt 2002	0
Comm #5028	Tsuga caroliniana - (Tsuga canadensis) / Rhododendron maximum Forest » more details accession code: VB.CC.22858.TSUGACAROLINIAN	Southeastern Ecology Working Gro...	0	This association encompasses Tsuga caroliniana forests on valley bottoms, gorge slopes, or other protected landforms. Tsuga canadensis or Pinus strobus may share the canopy with Tsuga caroliniana. The shrub stratum is typically dense and dominated by Rhododendron maximum. Galax urceolata is a common understory component.
Comm #5029	Pinus palustris / Schizachyrium scoparium - Muhlenbergia expansa - Helianthus radula Woodland » more details accession code: VB.CC.27014.PINUSPALUSTRISS	Southeastern Ecology Working Gro...	0	This association occurs on upland rises in the lowest terrace of coastal flatwoods in the Florida parishes of Louisiana. Examples typically support an open canopy of Pinus palustris. Shrub and midstory layers are generally absent in high-quality, well-burned examples. The understory has a well-developed herbaceous layer dominated by grasses. Typical herbaceous species are Schizachyrium scoparium, Muhlenbergia expansa, Helianthus radula, Schizachyrium tenerum, Gaylussacia dumosa (= var. dumosa), Lobelia brevifolia, Chaptalia tomentosa, Xyris caroliniana, Carphephorus odoratissimus, Aristida purpurascens var. virgata, Pityopsis graminifolia, Solidago rugosa, Solidago odora, Symphyotrichum adnatum (= Aster adnatus), Tephrosia onobrychoides, Eryngium yuccifolium, and Aletris aurea.
Comm #5030	Populus balsamifera ssp. trichocarpa - Picea engelmannii / Equisetum arvense Forest » more details accession code: VB.CC.28250.POPULUSBALSAMIF	Western Ecology Working Group of...	0	This uncommon association is known from scattered locations in Glacier National Park, Montana, and Waterton Lakes National Park, Alberta. This forest association is found at 949 m (3110 feet) elevation on the basin floor of a wide river valley (on an old river meander) and at 1380 m (4525 feet) elevation on a gentle west-facing slope in bottomlands. The association occurs on silty loam soils on glacio-fluvial deposits. Stands vary from saturated much of the year to seasonally flooded but are moderately well-drained by early autumn. Picea engelmannii and Populus balsamifera ssp. trichocarpa dominate the multi-layered canopy, with Equisetum arvense abundant in the herbaceous layer. Picea engelmannii has an average cover of 23% in the tree canopy with trace cover of younger trees and seedlings in other layers. Populus balsamifera ssp. trichocarpa has 35% cover in the tree canopy, 15% in the tree subcanopy, and 3% cover of saplings and seedlings. In more mesic stands, Symphoricarpos albus clearly dominates the shrub layer with 60% cover. Other shrubs with 50% constancy but noticeable cover were Cornus sericea, Symphoricarpos occidentalis, Rubus pubescens, and Crataegus douglasii. The herbaceous layer is dominated by Equisetum arvense, which ranges from 10% to 70% cover. Tall forbs are conspicuous, such as Maianthemum species and Heracleum maximum. Mosses have 0 to 10% cover in both sites, and litter and duff cover up to 80% of the ground.