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Lock 12

Along the Susquehanna River
Lancaster County, Pennsylvania
(plus some in York County)

      bloom date
Acer rubrum red maple
Acer saccharinum silver maple
Actinomeris alternifolia wingstem 8/6/1992
Agalinus purpurea purple gerardia 8/16/2003
Alisma triviale water plantain 7/12/1998
Allium canadense wild onion 6-10-07
Allium cernuum nodding onion 7/12/1998
Amorpha fruiticosa false indigo 5/30/1997
Andropogon gerardii big blue stem 7/20/1996
Andropogon virginicus broom sedge
Anemone canadense Canada anemone 6-10-07 8/16
Apios americana groundnut 8/16/2003
Apocynum cannabinum Indian hemp 6-10-07
Aquilegia canadensis columbine 5/24/2003
Arabis lyrata lyre-leaved rock cress 6-10-07 in bloom and ripe seed
Aralia hispida bristly sarsaparilla 6/7/1991
Arenaria serpyllifolia ssp leptoclados thyme-leaved sandwort 6-10-07
Asclepias incarnata swamp milkweed 8/6/1992
Asimina triloba pawpaw
Asplenium montanum mountain spleenwort
Asplenium pinnatifidum lobed spleenwort
Asplenium platyneuron ebony spleenwort
Asplenium trichomanes maidenhair spleenwort
Asplenium trudellii Trudell's spleenwort
Aster (Eurybia) divaricatus white wood aster
Aster (Symphiotrichum) dumosus bushy aster 9/8/1991
Aster (Symphiotrichum) lateriflorus calico aster 9/28/1991
Aster linariifolius stiff leaved aster 8/23/1992
Aster (Symphiotrichum) patens late aster 9/8/1991
Aster (Symphiotrichum) pilosus heath aster 9/28/1991
Aster simplex panicled aster 8/30/1987
Aureolaria flava yellow false foxglove 8/23/1992
Baptisia tinctoria yellow wild indigo 7/12/1998
Betula nigra river birch
Boltonia asteroides boltonia 7/12/1998
Cacalia atriplicifolia pale Indian plantain 8/16/2003
Cacalia suaveolens sweet scented Indian plantain 8/18/1990
Carex intumescens sedge
Carya cordiformis bitternut hickory
Cephalanthus occidentalis button bush 7/1/1990
Cerastium arvense field chickweed 5/24/2003
Chelone glabra turtle head 9/28/1991
Chionanthus virginicus fringe-tree 6-10-07 past bloom
Collinsonia canadensis horse balm
Coreopsis tripteris tall coreopsis 8/25/1991
Crataegus sp hawthorn
Dermatocarpon fluevialiti lichen
Diospyros virginiana persimmon 6-10-07
Eclipta alba yerba de tajo 9/8/1991
Elephantopsis carolinianus elephant's foot
Elymus virginicus Virginia wild rye 6-10-07
Epilobium coloratum purple leaved willow herb 9/8/1991
Epipactis helleborine helleborine
Equisetum arvense field horsetail
Eupatorium fistulosum Joe-Pye-weed 8/16/2003
Eupatorium perfoliatum boneset 9/8/1991
Eupatorium pilosum hairy boneset 7/1/1990
Eupatorium purpureum sweet scented Joe Pye weed 7/12/1998
Eupatorium rotundifolium round lved thoroughwort 8/16/2003
Eupatorium serotinum late flowering boneset 8/23/1992
Euphorbia corollata flowering spurge 8/18/1990
Euthamia graminifolia grass-leaved goldenrod
Galium circaezans wild licorice 6-10-07 green seed
Galussacia baccata black huckleberry
Gentiana andrewsii fringe tipped closed gentian
Gerardia purpurea purple gerardia
Helenium autumnales sneezeweed 8/18/1990
Helianthemum bicknellii frostweed 8/16/2003
Helianthemum canadense frostweed 7/12/1998
Helianthus decapetalus thin leaved sunflower 8/6/1992
Helianthus giganteus tall sunflower 9/28/1991
Heteranthera dubia water star grass 9/8/1991
Hibiscus laevis halberd leaved rose mallow 8/6/1992
Hibiscus moscheutos swamp rose mallow
Hieracium venosum rattlesnake-weed 6-10-07 in bloom & ripe seed
Houstonia caerulea bluets 5/30/1997
Houstonia longifolia long-leaved bluets 6-10-07 starting bloom
Hydrangea arborescens wild hydrangea 6-10-07
Hypericum canadense Canada St. Johnswort 7/20/1996
Hypericum gentianoides orange grass 8/18
Hypericum mutilum dwarf St. Johnswort 8/6/1992
Hypericum prolificum shrubby St. Johnswort 7/20/1996
Hypericum punctatum spotted St.Johnswort 7/12/1998
Hypoxis hirsutus star grass 6-10-07
Ilex verticillata winter berry 6-10 in bud
Ipomoea pandurata wild potato vine 7/12/1998
Iris versicolor larger blue flag 5/29/2004
Iris prismatica slender blue flag
Iris pseudacorus yellow iris 5/24/2003
Justica americana water willow 6-10-07 starting bloom
Kalmia latifolia mountain laurel 5/29/2004
Lathyrus venosus veiny pea 6-10-07 past bloom
Lespedeza capitata round-headed bush clover
Lespedeza intermedia wand like bushclover 8/30/1987
Lespedeza repens creeping bush clover
Liatris spicata blazing star 7/26/1992
Lilium superbum Turk's cap lily 7/20/1996
Lindernia dubia false pimpernel 9/8/1991
Lippia lanceolata frog fruit 9/28/1991
Lobelia cardinalis cardinal flower 9/8/1991
Lobelia siphilitica great blue lobelia 8/23/1992
Ludwiga alternifolia seedbox 7/12/1998
Lysimachia ciliata fringed loosestrife 7/3/1988
Lysimachia hybrida hybrid loosestrife
Lysimachia lanceolata lance lved loosestrife 8/25/1991
Lysimachia quadrifolia whorled loosestrife 6-10-07
Lysimachia terrestris swamp candles 7/3/1988
Lysimachia vulgaris garden loosestrife 7/26/1992
Lythrum salicaria purple loosestrife 7/1/1990
Matelea obliqua climbing milkweed
Mimulus ringens monkey flower 8/30/1987
Monarda clinopodia basil balm 8/6/1992
Myosoton aquaticum giant chickweed 7/20/1996
Nyssa sylvatica sourgum
Oenothera fruiticosa sundrops 6-10-07
Osmunda regalis royal fern
Panicum clandestinum deer-tongue grass
Panicum virgatum switch grass 7/20/1996
Penthorum sedoides ditch stonecrop 7/12/1998
Physocarpus opulifolius ninebark 5/24/2003
Physostegia virginiana false dragon head 8/30/1987
Platanus occidentalis sycamore
Polygala verticillata whorled milkwort 6/12/2004
Polygonum hydropiper common smartweed 9/8/1991
Polygonum hydropiperoides mild water pepper 9/8/1991
Polygonum lapathifolium nodding smartweed 9/8/1991
Polygonum pensylvanicum pink knotweed 9/8/1991
Potentilla simplex old field cinquefoil 6-10-07
Prenanthes album white lettuce 9/28/1991
Pycnanthemum muticum short toothed mountain mint 7/12/1998
Pycnanthemum tenuifolium narrow leaved mountain mint 8/16/2003
Pycnanthemum virginianum Virginia mountain mint 7/20/1996
Quercus muhlenbergii yellow oak
Rhododendron arborescens smooth azalea 6/10-07 ending bloom
Rhododendron periclymenoides pinxter 5/26/2001
Rosa virginiana Virginia rose 6-10-07
Sagittaria latifolia common arrowhead 8/6/1992
Schizachyrium scoparium little blue stem
Scrophularia lanceolata American figwort 6-10-07
Scutellaria incana downy skullcap 7/12/1998
Scutellaria galericulata marsh skullcap 7/12/1998
Senecio aureus golden ragwort 5/24/2003
Silene stellata starry campion 8/16/2003
Sisyrinchium angustiolium blue-eyed-grass 6-10-07
Sium suave water-parsnip 9/1/2001
Smilax herbacea carrion-flower 6-10-07
Solidago altissima late goldenrod 9/28/1991
Solidago arguta sharp leaved goldenrod 9/28/1991
Solidago bicolor silverrod 8/16/2003
Solidago caesia bluestem goldenrod 9/28/1991
Solidago canadensis Canada goldenrod 9/28/1991
Solidago flexicaulis zigzag goldenrod 9/28/1991
Solidago gigantea smooth goldenrod 9/28/1991
Solidago juncea early goldenrod 7/1/1990
Solidago nemoralis gray goldenrod 9/28/1991
Solidago odora sweet goldenrod 9/28/1991
Solidago rugosa rough leaved goldenrod 9/28/1991
Solidago simplex HBK ssp. Randii var. racemosa riverbank goldenrod 8/23/1992
Sorghastrum nutans Indian grass
Spiranthes cernuua nodding ladies tresses 9/28/1991
Spirea latifolia meadowseet 8/18/1990
Spirea tomentosa steeplebush 8/6/1992
Stachys tenuifolia smooth hedge nettle 7/12/1998
Stellaria puberua star chickweed 5/26/2001
Thalictrum polygamum tall meadow rue 7/26/1992
Tilia americana American linden
Tradescantia virginiana spiderwort 5/24/2003
Vaccinium angustifolium low sweet blueberry 6-10-07 green seed
Vaccinium corymbosum highbush blueberry 6-10-07 green seed
Vaccinium pallidum lowbush blueberry 6-10-07 green seed
Verbena hastata blue vervain 7/12/1998
Veronicastrum virginicum Culver's root 7/12/1998
Viburnum recognitum arrow wood 8/16/2003
Viola lancifolia lance leaved violet
Viola palmata early blue violet 6-10-07 past bloom
Vittaria appalachiana shootstring fern