Name:
Eragrostis hypnoides - Ludwigia palustris - Lindernia dubia - Cyperus squarrosus Herbaceous Vegetation
Reference:
Lea, C. 2000. Plant communities ...
Description:
This association occurs along major rivers in the Piedmont and mountains of Maryland, Virginia, West Virginia, and the District of Columbia. It occupies the lowest parts of riverbanks or very low rivershore depositional bars in areas that receive essentially full sunlight. These habitats are inundated for most of the winter and spring and are generally consistently exposed only from early summer to early autumn (i.e., the "drawdown" zone). During wet years they may be nearly continuously inundated. The type usually occurs as a narrow strip (frequently <2 m wide) along the shoreline. This association may also develop, sometimes as very large (>1 ha) patches, on the drawdown shores and seasonally exposed islands of impounded rivers. Vegetation of stands varies from sparse to dense (10-80% cover) and is characterized by low-growing mats of predominantly annual species, with some low, fast-growing perennials also present. <i>Eragrostis hypnoides, Ludwigia palustris, Lindernia dubia var. dubia</i>, and <i>Cyperus squarrosus</i> are constant and often abundant. Other characteristic annuals (and biennials) are <i>Acalypha rhomboidea, Ammannia coccinea, Artemisia annua, Bidens frondosa, Chamaesyce humistrata, Chamaesyce maculata, Chenopodium ambrosioides, Cyperus bipartitus, Cyperus odoratus, Diodia virginiana, Echinochloa crus-galli, Eclipta prostrata, Elsholtzia ciliata, Eragrostis frankii, Fimbristylis autumnalis, Hypericum mutilum, Lindernia dubia var. anagallidea, Lindernia dubia var. dubia, Lipocarpha micrantha, Mollugo verticillata, Panicum dichotomiflorum var. dichotomiflorum, Panicum gattingeri (= Panicum philadelphicum ssp. gattingeri), Paspalum fluitans, Polygonum caespitosum var. longisetum, Rorippa palustris ssp. fernaldiana, Rotala ramosior, Solanum ptychanthum</i>, and <i>Xanthium strumarium</i>. Frequent perennials include <i>Boehmeria cylindrica, Cyperus strigosus, Leersia virginica, Justicia americana, Lycopus americanus, Mimulus alatus, Penthorum sedoides, Phyla lanceolata, Rorippa sylvestris</i>, and <i>Samolus valerandi ssp. parviflorus</i>. Stranded mats of <i>Heteranthera dubia (= Zosterella dubia)</i> are also frequent. Seedlings of taller annuals and perennials such as <i>Hibiscus laevis, Eupatorium</i> spp., and <i>Polygonum</i> spp. are also frequent but rarely reach full stature. Overhanging trees of <i>Platanus occidentalis</i> and <i>Acer saccharinum</i> may be present, as well as saplings of <i>Betula nigra</i>.
Accession Code:
VB.CC.37260.CEGL006483
Plot-observations of this Community Concept:
0
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