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Comm #2621	Carex lasiocarpa - Trichophorum cespitosum - Rhynchospora capillacea / Andromeda polifolia Fen » more details accession code: urn:lsid:vegbank.org:commConcept:31404-{19AB272C-C3AC-4156-BF61-DCEDB80D2E9D}	NatureServe Biotics 2019	4	This extremely rich seepage fen is found in northern Minnesota and adjacent boreal regions in Canada. Stands occur on shallow or deep peaty soils in areas of calcareous discharge. The surface water may be circumneutral (pH 6.8-8.0), with high concentrations of dissolved salts that often form a marl precipitate. The vegetation is dominated by open sedge, rush, and moss species. The dominant graminoid species include <i>Carex lasiocarpa, Carex interior, Carex limosa, Carex livida, Trichophorum alpinum, Muhlenbergia glomerata, Rhynchospora capillacea</i>, and <i>Trichophorum cespitosum</i>. Local dominants may include <i>Carex exilis</i> and <i>Cladium mariscoides</i>. Common herbs include <i>Equisetum fluviatile, Galium labradoricum, Menyanthes trifoliata, Sarracenia purpurea, Triglochin maritima, Triantha glutinosa</i>, and <i>Utricularia intermedia</i>. Mosses include <i>Campylium stellatum, Limprichtia revolvens, Tomentypnum nitens</i>, and <i>Scorpidium scorpioides</i>. Shrub associates, though never dominant, include the dwarf-shrubs <i>Andromeda polifolia</i> and <i>Vaccinium oxycoccos</i>, and taller shrubs or scrubs such as <i>Betula pumila, Chamaedaphne calyculata, Larix laricina, Lonicera villosa, Dasiphora fruticosa ssp. floribunda, Picea mariana, Rhamnus alnifolia</i>, and <i>Rubus arcticus ssp. acaulis</i>.
Comm #2622	Pinus ponderosa / Alnus incana Riparian Woodland » more details accession code: urn:lsid:vegbank.org:commConcept:31546-{245ED4E8-FE72-4469-9B62-840C0A72B035}	NatureServe Biotics 2019	4	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 with a narrow band of <i>Alnus incana ssp. tenuifolia</i> 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, as are <i>Prunus virginiana, Salix bebbiana</i>, and <i>Salix 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 #2623	Populus angustifolia / Salix (monticola, drummondiana, lucida) Riparian Woodland » more details accession code: urn:lsid:vegbank.org:commConcept:31553-{EF3B26ED-DEBD-4B6D-A685-1BFA9BF5D9E8}	NatureServe Biotics 2019	4	This riparian woodland association occurs at moderate elevations (2400-2700 m) on all types of active floodplains throughout the Colorado Plateau, Great Basin and San Juan Mountains of Colorado, Utah and Nevada. Stands generally occur within 0.3-1.4 m (1-4.5 feet) of the active channel elevation. All sites show signs of active flooding; soils are somewhat deep (1 m) loamy to clay soils over very coarse alluvial layers. This is an early- to mid-seral stage of more mature <i>Populus angustifolia</i>-dominated plant associations, with an upper canopy dominated by young (12-53 cm dbh) <i>Populus angustifolia</i> (25-80% cover) and a diverse understory of willows and other shrubs. The shrub understory (15-85% cover) consistently includes two or more willow species of the following: <i>Salix exigua, Salix ligulifolia, Salix monticola, Salix lucida ssp. caudata, Salix drummondiana</i>, and <i>Salix geyeriana</i>, although none individually exceeds 10% cover. Other shrubs present may include <i>Rosa woodsii, Ribes</i> spp., <i>Alnus incana, Crataegus rivularis, Dasiphora fruticosa ssp. floribunda</i>, and/or <i>Symphoricarpos</i> spp., with none exceeding 5% cover. The herb layer is generally low in total cover (10-30% cover forbs, 10-15% cover graminoids). Common herbaceous species include <i>Maianthemum stellatum, Erigeron</i> spp., and the introduced species <i>Trifolium</i> spp., <i>Poa pratensis</i>, and <i>Bromus inermis</i>.
Comm #2624	Populus fremontii / Betula occidentalis Wooded Shrubland » more details accession code: urn:lsid:vegbank.org:commConcept:31883-{05E06B19-0217-4323-A507-76C81DC3D2DB}	NatureServe Biotics 2019	4	This association has only been described from Zion National Park, Utah. Additional global information will be added as it becomes available. Vegetation structure and cover in this association are variable. <i>Populus fremontii</i> may be present as young trees contributing to the tall-shrub layer, codominated by riparian shrubs <i>Betula occidentalis</i> and <i>Salix</i> spp. In some cases, <i>Populus fremontii</i> or <i>Juniperus scopulorum</i> may occur as mature trees with a canopy cover of 5-20%. <i>Betula occidentalis</i> dominates the shrub layer (10-40% cover) accompanied by various shrubs of inconsistent frequency depending on the adjacent upland vegetation. Most frequently occurring or characteristic shrubs of this association are <i>Salix</i> spp. and <i>Rosa woodsii</i>. The herbaceous layer has variable composition, with average cover of 30% and relatively tall structure. This may not be true where recreational trails intersect streambanks and the vegetation is trampled. Common herbaceous species include <i>Agrostis stolonifera, Poa pratensis</i>, and <i>Maianthemum stellatum</i>. Elevation for this association is 1675 to 1830 m (5500-6000 feet), but it does occur at lower elevations if the site is shaded and north-facing. It occurs on flat to gentle sloping streambanks and benches on sandy loam soils.
Comm #2625	Eleocharis macrostachya Alliance » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28875-{85B23DCB-1E2F-4B86-9003-5657502D28E7} NOT CURRENTLY ACCEPTED	MCV2	4
Comm #2626	Bromus hordeaceus – Holocarpha virgata – Taeniatherum caput-medusae Semi-natural Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28869-{4B16CF66-07AB-424B-90C8-F95835F20853} NOT CURRENTLY ACCEPTED	MCV2	4
Comm #2627	Quercus douglasii / Grass Association » more details accession code: urn:lsid:vegbank.org/vegbranch:commConcept:28617-{5B1E32A9-C919-4BA3-8032-477E8FA0692F} NOT CURRENTLY ACCEPTED	MCV2	4
Comm #2628	Pinus virginiana / Vaccinium pallidum / Schizachyrium scoparium - Carex pensylvanica Woodland » more details accession code: urn:lsid:vegbank.org:commConcept:32497-{34167141-9F7F-4BCB-A852-445EBA61CBD5}	NatureServe Biotics 2019	4	This community occurs on steep, shaley slopes in the Southern Appalachians and has an open to closed, stunted canopy and sparse herb and shrub strata characterized by species able to grow in loose shale fragments. It is known from the Hot Springs Window, in the Blue Ridge Mountains, and occurs elsewhere in the Southern Appalachians, such as the Chauga Basin, South Carolina, and from Chilhowee Mountain, Tennessee. The canopy (5-25 m tall, 25-75% cover) is dominated by <i>Pinus virginiana</i>, with <i>Quercus montana</i> and <i>Quercus rubra</i> sometimes present in substantial numbers in less extreme habitats. The shrub layer is very sparse, and may include scattered individuals of <i>Kalmia latifolia, Vaccinium stamineum</i>, and <i>Vaccinium pallidum</i>. The herb layer is very sparse to patchy, and is dominated by <i>Schizachyrium scoparium, Carex pensylvanica, Danthonia spicata, Dichanthelium linearifolium</i>, with scattered individuals of <i>Coreopsis major, Houstonia longifolia, Hieracium venosum</i>, and <i>Euphorbia corollata</i>. Lichens are frequent, particularly on in-place outcrops, and include <i>Cladonia rangiferina</i> and <i>Cladonia</i> spp. Loose shale fragments cover 50-90% of the ground surface. It is apparently a long-lived community, maintained by harsh edaphic conditions of steep slopes and shifting shale substrate. The community can vary quite widely from a very open canopy to one that is almost closed in cases where the slope is less steep and/or the rock underlying the stand is more stable.
Comm #2629	Pinus echinata - Quercus alba / Viburnum (dentatum, acerifolium) Forest » more details accession code: urn:lsid:vegbank.org:commConcept:32713-{36A20A68-8216-443A-8D60-6EB5BA0183EB}	NatureServe Biotics 2019	4	This mesic to dry-mesic forest of the West Gulf Coastal Plain is typified by an overstory of both <i>Pinus echinata</i> and <i>Quercus alba</i>. In high-quality examples, <i>Pinus taeda</i> is rare to absent as would have been expected in most areas of the presettlement landscape. <i>Quercus alba</i> may be more important than <i>Pinus echinata</i> in some examples, possibly those which have received the least amount of disturbance. These are normally closed forests above a well-developed subcanopy of mixed hardwoods. The density and composition of the shrub and herbaceous layers vary greatly depending upon a number of factors, including the range of moisture and potential nutrient conditions which are possible in stands assigned to this type. <i>Viburnum dentatum</i> and <i>Viburnum acerifolium</i> are listed as nominals suggesting the most mesic stands of this type; somewhat less mesic examples may lack these species.
Comm #2630	Rhynchospora filifolia - Juncus abortivus Marsh » more details accession code: urn:lsid:vegbank.org:commConcept:32975-{C150BA1C-1284-459E-9981-7307854212F2}	NatureServe Biotics 2019	4	This association occupies lower margins of limesinks and other ponds of the Atlantic and Gulf coastal plains of the United States from North Carolina south to Florida and west to Alabama. Stands are dominated by <i>Rhynchospora filifolia</i> and <i>Juncus abortivus</i>. Other characteristic species include <i>Rhynchospora pleiantha, Eleocharis tricostata, Centella erecta, Rhynchospora nitens</i>, and <i>Juncus repens</i>.