Maryland Native Plant Society Plant Lists We offer these lists to individuals and groups to enhance the enjoyment and study of plants of different locations in Maryland and nearby states. Their accuracy has not been verified by the Maryland Native Plant Society. CHAIN BRIDGE FLATS, WASHINGTON DC This list records plants seen during a field trip to Chain Bridge Flats near the Chain Bridge over the Potomac River on October 13, 2002. Field trip led by Cris Fleming. Plant list by Jane Hill. Nomenclature follows the USDA Plant Database at http://plants.usda.gov (January 2011). Synonyms are footnoted for some species. Agalinis purpurea Purple gerardia Scrophulariaceae Andropogon gerardii Big bluestem Poaceae Artemisia annua Annual wormwood Asteraceae Arthraxon hispidus Hairy jointgrass Poaceae Baptisia australis Blue false indigo Fabaceae Bidens aristosa1 Tickseed-sunflower Asteraceae Bidens cernua Nodding bur-marigold Asteraceae Callitriche sp. Water starwort Callitrichaceae Ceanothus herbaceus Prairie redroot Rhamnaceae Chamaecrista nictitans2 Wild sensitive plant Fabaceae Chenopodium ambrosioides Mexican tea Chenopodiaceae Cynanchum laeve Sandvine Asclepiadaceae Dichanthelium clandestinum3 Deer-tongue grass Poaceae Eleocharis compressa Flattened spike-rush Cyperaceae Elymus riparius Riverbank wild rye Poaceae Eupatorium rotundifolium4 Hairy thoroughwort Asteraceae Helianthus occidentalis Western sunflower Asteraceae Humulus japonicus Japanese hops Cannabaceae Hydrocotyle sp. Pennywort Apiaceae Hypericum prolificum 5 Shrubby St. Johnswort Clusiaceae Justicia americana Water-willow Acanthaceae Kyllinga sp.6 Sedge Cyperaceae Lathyrus venosus Veiny pea Fabaceae Lespedeza cuneata Japanese bush-clover Fabaceae Ludwigia peploides7 Creeping primrose-willow Onagraceae Lycopus sp. Bugleweed Lamiaceae Panicum virgatum Switchgrass Poaceae Penthorum sedoides Ditch stonecrop Crassulaceae Polygonum lapathifolium Dock-leaved smartweed Polygonaceae Polygonum punctatum Water smartweed Polygonaceae Pycnanthemum tenuifolium Narrow-leaved mountain-mint Lamiaceae Quercus bicolor Swamp white oak Fagaceae Quercus imbricaria Shingle oak Fagaceae Ranunculus recurvatus Hooked buttercup Ranunculaceae Salix caroliniana Carolina willow Salicaceae Schizachyrium scoparium Little bluestem Poaceae Solidago altissima Tall goldenrod Asteraceae Solidago gigantea Late goldenrod Asteraceae Solidago juncea Early goldenrod Asteraceae Solidago simplex8,9 Riverbank goldenrod Asteraceae Symphyotrichum dumosum10 Bushy aster Asteraceae Symphyotrichum lanceolatum11 Panicled aster Asteraceae Trachelospermum difforme Climbing dogbane Apocynaceae Veronicastrum virginicum Culver's-root Scrophulariaceae Wolffia sp. Water-meal Lemnaceae 1 Bidens polylepis 2 Cassia nictitans 3 Panicum clandestinum 4 Eupatorium pubescens 5 Hypericum spathulatum 6 Cyperus sp. 7 Jussiaea repens 8 Solidago spathulata 9 Solidago racemosa 10 Aster dumosus 11 Aster simplex .