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Comm #5011	Thuja plicata / Clintonia uniflora - Xerophyllum tenax Forest » more details accession code: VB.CC.32143.CEGL005930	Western Ecology Working Group of...	0	This is a small- to large-patch forested community found in the northern Rocky Mountains of western Montana west into northeastern Washington. This type generally occupies the highest elevation <i>Thuja plicata</i> communities, representing relatively cold and dry environments. Its known elevational range is 790 to 1675 m (2600-5500 feet). This type is very heterogeneous, occurring across a broad range of habitat conditions; it occurs from toeslope positions to the tops of ridges and on all degrees of slope and all aspects. Parent materials are variable, with loess and ash caps deposited over glacial outwash and till in some areas. The upper soil horizons are well- to excessively drained and coarse-textured (in some areas sandy soils predominate). Glacial compression is invoked as the reason many of the soil profiles have a compacted subsoil, which results in shallow rooting and accounts in part for the more xeric nature of these sites. The canopy cover of this forest type is usually in excess of 60%, with <i>Thuja plicata</i> comprising at least 25% of the total. Because seral tree species occupy these sites readily following disturbance, <i>Pseudotsuga menziesii, Larix occidentalis, Pinus contorta</i>, and <i>Picea engelmannii</i> commonly occur across the range of this type, but in northern Idaho <i>Abies grandis</i> often shares dominance with <i>Thuja</i>. Sites transitional to subalpine occasionally have appreciable cover of <i>Abies lasiocarpa</i>. The understory, in which <i>Thuja</i> is 100% constant, gives every indication that these stands will be <i>Thuja</i>-dominated late in the sere. The tall-shrub component is mostly dispersed clumps, and no one species has high constancy, though <i>Acer glabrum, Alnus viridis ssp. sinuata, Amelanchier alnifolia</i>, and <i>Sorbus scopulina</i> may have 5-10 % cover, singly or in the aggregate. The short-shrub layer is dominant with the indicator <i>Vaccinium membranaceum</i> nearly 100% constant and generally exhibiting greater than 15% cover. Other regularly occurring short shrubs include <i>Paxistima myrsinites, Spiraea betulifolia, Rosa gymnocarpa, Rubus parviflorus</i>, and <i>Lonicera utahensis</i>. The dwarf-shrub <i>Linnaea borealis</i> is always present and its cover can approach 20%. <i>Bromus vulgaris</i> is often the only graminoid represented. In the forb layer <i>Clintonia uniflora</i> and <i>Tiarella trifoliata</i> are reflective of relative mesic conditions, whereas <i>Xerophyllum tenax</i> (considered an indicator when having 5% or greater cover) is indicative of <i>Thuja</i> at its cold, dry extremes, transitional to subalpine habitats. In the northwestern portion of this type's distribution, <i>Xerophyllum</i> appears to be sporadically distributed and <i>Vaccinium</i> is relied on as the alternative indicator.
Comm #5012	Juniperus occidentalis / Achnatherum thurberianum Woodland » more details accession code: VB.CC.32252.CEGL002635	Western Ecology Working Group of...	0	These are open woodlands or juniper savannas which are restricted to barren, ashy soils in the central Oregon juniper zone. <i>Juniperus occidentalis / Achnatherum thurberianum (= Stipa thurberiana)</i> woodlands are found on all aspects and slopes, on elevations between 610 and 1370 m (2000-4500 feet). <i>Juniperus occidentalis</i> is the only tree, with the cover ranging from 5-20%. <i>Juniperus occidentalis</i> trees can be very large and quite old, with individuals found to be over 1000 years old in similar habitats in central Oregon. <i>Artemisia tridentata ssp. wyomingensis</i> is common in some areas and absent from others, with cover from 0-40%. <i>Ericameria nauseosa (= Chrysothamnus nauseosus), Salvia dorrii, Peraphyllum ramosissimum, Purshia tridentata</i>, and <i>Atriplex confertifolia</i> are shrubs that can occasionally be found in this type. The understory is dominated by <i>Achnatherum thurberianum</i>, which is always present, at 2-50% cover. <i>Pseudoroegneria spicata</i> is often codominant, especially in stony microsites. In areas with more exposed ash, <i>Hesperostipa comata (= Stipa comata)</i> and <i>Achnatherum hymenoides (= Oryzopsis hymenoides)</i> can also be important, and <i>Poa secunda</i> and <i>Leymus cinereus (= Elymus cinereus)</i> occur. Annual forbs (<i>Mimulus nanus, Eriogonum vimineum, Crocidium multicaule, Collinsia parviflora, Blepharipappus scaber, Cleome platycarpa</i>) and perennial forbs (<i>Balsamorhiza sagittata, Astragalus filipes, Astragalus purshii, Calochortus macrocarpus, Castilleja</i> spp., <i>Erigeron filifolius, Eriogonum umbellatum, Lomatium hendersonii</i>) occur and make the association species rich, but provide very little cover. <br><br>~<i>Juniperus occidentalis / Achnatherum thurberianum</i> Woodland (CEGL002635)$$ is similar to ~<i>Juniperus occidentalis / Pseudoroegneria spicata</i> Wooded Herbaceous Vegetation (CEGL001728)$$, but is distinguished by its lower grass cover, its barren, exposed John Day and Clarno ash soils, and the predominance of <i>Achnatherum thurberianum, Achnatherum hymenoides</i> or <i>Hesperostipa comata</i> in the grass understory.
Comm #5013	Quercus velutina - Quercus coccinea - Carya texana Ozark Forest » more details accession code: VB.CC.28306.QUERCUSVELUTINA	Midwestern Ecology Working Group...	0	This oak - hickory forest community is found in the United States in the Ozarks of southeastern Missouri and possibly northeastern Arkansas. Stands occur on dry slopes, with thin soils and primarily a cherty bedrock near the surface. The canopy is dominated by Quercus velutina, Quercus coccinea, and Carya texana. Other associates and understory characteristics have yet to be described, but Quercus alba may also be present, along with minor amounts of Pinus echinata and shrubs such as Vaccinium arboreum. Sources indicate that this type primarily occurs on former Pinus echinata woodland sites that were completely logged, then grazed and burned, leading to a degraded oak forest.
Comm #5014	Metrosideros polymorpha / Dicranopteris spp. Lowland Wet Shrubland » more details accession code: VB.CC.18460.METROSIDEROSPOL	Western Ecology Working Group of...	0
Comm #5015	A.1895 » more details accession code: VB.CC.1594.A1895 NOT CURRENTLY ACCEPTED	EcoArt 2002	0	This shrubland, dominated by ~Lantana camara$, is a disturbance type, following fire.
Comm #5016	Acacia koa Montane Forest Alliance » more details accession code: VB.CC.21699.ACACIAKOAMONTAN	Western Ecology Working Group of...	0
Comm #5017	CEGL003879 » more details accession code: VB.CC.5705.CEGL003879 NOT CURRENTLY ACCEPTED	EcoArt 2002	0
Comm #5018	Leymus triticoides - Carex spp. Herbaceous Vegetation » more details accession code: VB.CC.20100.LEYMUSTRITICOID	Western Ecology Working Group of...	0
Comm #5019	Pinus flexilis / Festuca idahoensis Woodland » more details accession code: VB.CC.20102.PINUSFLEXILISFE	Western Ecology Working Group of...	0
Comm #5020	Pericome caudata Sparsely Vegetated Alliance » more details accession code: VB.CC.19753.PERICOMECAUDATA	Southeastern Ecology Working Gro...	0	Igneous talus at moderate to high elevations in mountain ranges of Trans-Pecos Texas. Pericome caudata is the primary species present, sometimes joined by 'strays' from adjacent communities.