Element Identifiers
NVCS association: Panicum hemitomon - Pluchea (camphorata, rosea) - Ludwigia spp. Herbaceous Vegetation
Database Code: CEGL007792
Formation: Seasonally flooded temperate or subpolar grassland
Alliance: PANICUM HEMITOMON SEASONALLY FLOODED TEMPERATE HERBACEOUS ALLIANCE (V.A.5.N.k.18)
Element Concept
Summary: This vegetation represents ponds, or zones of ponds, dominated by Panicum hemitomon and various perennial grasses and forbs in the East Gulf Coastal Plain and adjacent ecoregions. This broadly defined association was described to cover shallow ponds (or shallow zones of variable ponds) of the East Gulf Coastal Plain, including limesink ponds and other types. Pluchea spp. (Pluchea camphorata, Pluchea rosea) are characteristic. Other characteristic species include Saccharum spp., Scirpus cyperinus, Dichanthelium spp., Panicum spp., and Rhynchospora spp. in outer zones of shorter hydroperiod, and shorter-stature graminoids and forbs such as Centella erecta, Ludwigia spp., Xyris spp., Hydrocotyle spp., Eleocharis spp., and Juncus spp. in zones of longer hydroperiod. Some stands may contain Woodwardia virginica.
Environment: This vegetation represents ponds, or zones of ponds, dominated by Panicum hemitomon and various perennial grasses and forbs in the East Gulf Coastal Plain and adjacent ecoregions. This broadly defined association was described to cover shallow ponds of the East Gulf Coastal Plain, including limesink ponds and other types. Some stands on the Ocala and Osceola national forests may contain Woodwardia virginica and various woody plants. These ponds may be peatier or more shady than some other examples.
Vegetation: Stands of this vegetation are dominated by Panicum hemitomon and various perennial grasses and forbs. Pluchea spp. (Pluchea camphorata, Pluchea rosea) are characteristic. Other characteristic species include Saccharum spp., Scirpus cyperinus, Dichanthelium spp., Panicum spp., and Rhynchospora spp. in outer zones of shorter hydroperiod, and shorter-stature graminoids and forbs such as Centella erecta, Ludwigia spp., Xyris spp., Hydrocotyle spp., Eleocharis spp., and Juncus spp. in zones of longer hydroperiod. Ponds seen on the De Soto National Forest (Jones and Perry counties, Mississippi) have two distinct zones; one (cf. CEGL007792) is dominated by Panicum hemitomon with other grasses and graminoids such as Saccharum giganteum, Saccharum brevibarbe, Scirpus cyperinus, Dichanthelium scabriusculum, Panicum rigidulum, Leersia sp., and Rhynchospora glomerata. In addition, Fuirena breviseta, Ludwigia pilosa, and Pluchea rosea are also found there. A less diverse zone of longer hydroperiod (cf. CEGL004127) is dominated by low graminoids and forbs. Eleocharis robbinsii and Eleocharis melanocarpa may exhibit heavy dominance; Carex glaucescens, Juncus repens, and Proserpinaca pectinata are also typically present. Limesink ponds in the Conecuh National Forest (Alabama) are dominated by Panicum hemitomon with Polygonum hirsutum, Sagittaria isoetiformis, Centella erecta, Eupatorium capillifolium, Pluchea rosea, Ludwigia peploides, Hypericum fasciculatum?, Ludwigia sp., Xyris sp., Hydrocotyle sp., Eleocharis sp., and Juncus spp. Ponds on the Osceola National Forest (Florida) contain Panicum hemitomon, Andropogon glaucopsis, Andropogon virginicus var. virginicus, Eupatorium capillifolium, Pluchea rosea, Eleocharis, sp. Bidens mitis, Cyperus lecontei, Ludwigia maritima, Polypremum procumbens, Xyris jupicai, Symphyotrichum lateriflorum var. lateriflorum (= Aster vimineus), Senna obtusifolia, Centella erecta, Hydrocotyle umbellata, Lycopus rubellus, and Mikania scandens. Some stands on the Ocala and Osceola national forests which are apparently less diverse may contain Woodwardia virginica and various woody plants (e.g., Cephalanthus occidentalis, Litsea aestivalis, Hypericum fasciculatum, Hypericum tetrapetalum, Leucothoe racemosa, and Lyonia lucida. These ponds may be peatier or more shady than some other examples, but are classed here for now.
Dynamics: See Summary
Similar Associations:
Panicum hemitomon - Eriocaulon compressum - Rhynchospora corniculata Herbaceous Vegetation (CEGL004578)--of the West Gulf Coastal Plain.
Panicum hemitomon - Eleocharis equisetoides - Rhynchospora inundata Herbaceous Vegetation (CEGL004127)--primarily of the Atlantic Coastal Plain is also attributed to the East Gulf Coastal Plain; it may represent a regional or zonal variant.
IIE1f. Coastal Plain Small Depression Pond Complex (Allard 1990) B. in part
Comments: Ponds seen on the De Soto National Forest (Jones and Perry counties, Mississippi) have two distinct zones; one (cf. CEGL007792) is dominated by Panicum hemitomon, with other grasses and graminoids such as Saccharum giganteum, Saccharum brevibarbe, Scirpus cyperinus, Dichanthelium scabriusculum, Panicum rigidulum, Leersia sp., and Rhynchospora glomerata; Fuirena breviseta, Ludwigia pilosa, and Pluchea rosea are also found here. A less diverse zone of longer hydroperiod (cf. CEGL004127) is dominated by low graminoids and forbs. Eleocharis robbinsii and Eleocharis melanocarpa may exhibit heavy dominance; Carex glaucescens, Juncus repens, and Proserpinaca pectinata are also typically present. Limesink ponds in the Conecuh National Forest (Alabama) are dominated by Panicum hemitomon, with Polygonum hirsutum, Sagittaria isoetiformis, Centella erecta, Eupatorium capillifolium, Pluchea rosea, Ludwigia peploides, Hypericum fasciculatum?, Ludwigia sp., Xyris sp., Hydrocotyle sp., Eleocharis sp., and Juncus spp. One example of a maidencane pond at Fort Benning, Georgia (L6 Pond, 232Bq), has seasonal codominance by Eleocharis robbinsii and Eleocharis tricostata. It is probably best placed with CEGL004127, but placement between CEGL004127 and CEGL007792 is somewhat problematic because the two associations are not perfectly distinguished from one another. See Panicum hemitomon - Eriocaulon compressum - Rhynchospora corniculata Herbaceous Vegetation (CEGL004578) for related deeper pond vegetation of the West Gulf Coastal Plain. On Fort Benning, Georgia, this or related vegetation grades into that of the V.A.5.N.k Rhynchospora spp. - Panicum (rigidulum, verrucosum) - Rhexia virginica Seasonally Flooded Herbaceous Alliance (A.1384), which appears to be in areas of generally shorter hydroperiod.
Conservation Ranking & Rare Species
GRank: G3? (98-09-10):
High-ranked species: LITSEA AESTIVALIS (G3)
Element Distribution
Range: This vegetation is found in the East Gulf Coastal Plain and adjacent ecoregions.
States: AL FL GA LA? MS
Crosswalk to State Classifications:
FL: Basin Marsh?, in part (FL 1992)
GA: Limnetic Zone, Limesink Lake, in part; Littoral Zone, Limesink Lake, in part (GA 1990)
TNC Ecoregions: 43:?, 53:C, 55:C, 56:C
USFS Ecoregions: 232Ba:CCP, 232Bb:CCP, 232Bc:CCP, 232Be:CCP, 232Bf:CCC, 232Bi:CCP, 232Bj:CCC, 232Bk:CCC, 232Bl:CCP, 232Bm:CCP, 232Bn:CCP, 232Bo:CCP, 232Bq:CCC, 232Ca:CCC, 232Dc:CPP
Federal Lands: DOD (Fort Benning); USFS (Conecuh, De Soto, Ocala, Osceola)
Element Sources
References: Allard 1990, Allard et al. 1990, Ambrose 1990a, FNAI 1992a, NatureServe Ecology - Southeast U.S. unpubl. data
Emergent Ponds and Marshes
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