Nebraska Native Plant Society

SOME PLANTS SEEN ON THE FIELD TRIP TO THE FLOODPLAIN FOREST AT TWO RIVERS PARK, DOUGLAS COUNTY, NEBRASKA JUNE 13, 2009

This list was prepared from memory by Robert Kaul and David Sutherland. There are many other species at this site that were not in flower on this date.

(* = introduced, naturalized species)

ACERACEAE, maple family

Acer saccharinum, silver maple (abundant)

ADOXACEAE

Sambucus canadensis, elderberry (here and there)

ANACARDIACEAE, sumac family

Rhus glabra, smooth sumac

Toxicodendron radicans var negundo, poison ivy (everywhere on forest floor and climbing high into the trees)

APIACEAE, parsley family

Conium maculatum, poison hemlock* (common at edge of woods)

Cryptotaenia canadensis, honewort, (common in the woods)

Osmorhiza claytonia or O. longistylis, sweet cicely (2 species possible)

Sanicula canadensis, sanicle

Sanicula odorata, sanicle

Zizia aurea, golden alexanders (a few along the path)

APOCYNACEAE, milkweed family

Apocynum cannabinum, dogbane (abundant in prairie at woods edge)

Asclepias syriaca, with the dogbane (above)

ARACEAE, arum family

Arisaema dracontium, dragonroot or green dragon (a few in the woods)

Arisaema triphyllum, jack-in-the-pulpit (a few in the woods)

ASTERACEAE, sunflower family

Ageratina altissima, white snakeroot (common, not in flower; formerly called Eupatorium rugosum)

Erechtites hieraciifolium, fireweed (a few in disturbed places)

BETULACEAE, birch family

Corylus americana, American hazelnut (common at forest edge, some with young fruit)

BIGNONIACEAE, catalpa family

Catalpa speciosa, northern catalpa* (one tree in flower in the woods)

BRASSICACEAE, mustard family

Hesperis matronalis, dameís rocket* (a few along the path)

CAESALPINIACEAE, caesalpinia family

Gleditsia triacanthos, honey locust (a few trees in the woods)

Gymnocladus dioica, Kentucky coffee tree (one tree seen)

CANNABACEAE, hemp family

Humulus lupulus, hop (one vine seen in woods)

CAPRIFOLIACEAE, honeysuckle family

Lonicera maackii, Amur honeysuckle* (several at woods edge; an invasive species)

Symphoricarpos orbiculatus, coralberry (common in woods)

CELASTRACEAE, bittersweet family

Celastrus scandens, bittersweet (a few vines at forest edge)

CELTIDACEAE, hackberry family

Celtis occidentalis, hackberry (a few trees in the forest)

CHENOPODIACEAE, goosefoot family

Chenopodium simplex, maple-leaf goosefoot (forest edge); formerly C. hybridum and C.gigantospermum

COMMELINACEAE, spiderwort family

Tradescantia bracteata, spiderwort (forest edge)

CORNACEAE, dogwood family

Cornus drummondii, rough-leaf dogwood (abundant in forest, some almost treelike)

CYPERACEAE, sedge family

Carex lupulina, hop sedge (swampy woods; rare in Nebraska, known only from a few sites)

Carex tenera (swampy woods)

Carex, several other species

ELAEAGNACEAE, oleaster family

Elaeagnus umbellata, autumn olive* (common at forest edge; an invasive species)

FABACEAE, pea family

Amorpha fruticosa, wild-indigo (riverside)

Desmodium glutinosum, large-flowered tick-clover (common at woods edge and open places in woods; leaves resemble poison-ivyís)

Lotus corniculatus, birdís-foot trefoil* (in prairie at forest edge)

Medicago lupulina, black medick* (along path)

FAGACEAE, oak family

Quercus macrocarpa, bur oak (a few in the woods)

GROSSULARIACEAE, gooseberry family

Ribes missouriense, Missouri gooseberry (with many green fruits)

IRIDACEAE, iris family

Iris virginica variety shrevei, southern blue flag (one colony seen in flower)

JUNCACEAE, rush family

Juncus tenuis, path rush (common along paths)

LAMIACEAE, mint family

Glechoma hederacea, ground ivy* (along the paths)

Nepeta cataria, catnip* (woods edge)

Teucrium canadense, American germander (in the woods)

LILIACEAE, lily family

Smilacina stellata, starry false Solomonís-seal (common in the woods, some with immature fruits); now often called Maianthemum stellatum

MENISPERMACEAE, moonseed family

Menispermum canadense, moonseed vine (common in and at woods edge, many in flower; the male and female flowers are borne on separate plants)

MORACEAE, fig family

Morus alba, white mulberry* (common, including some with large, unlobed leaves but that are definitely not red mulberry, M. rubra)

OXALIDACEAE, wood-sorrel family

Oxalis stricta, yellow oxalis

PHRYMACEAE, lopseed family

Phryma leptostachya, lopseed (a few in the woods, not yet flowering)

PLANTAGINACEAE, plantain family

Plantago major or P. rugelii, or both (abundant along the paths; not in flower)

POACEAE, grass family

Bromus latiglumis, a brome (in the woods)

Dactylis glomerata, orchard grass* (in woods)

Festuca semiverticillata, nodding fescue (in woods)

Glyceria striata, fowl mannagrass (in wet woods)

Panicum oligosanthes var. scribnerianum, Scribnerís panicum (along sunny paths)

Poa pratensis, Kentucky bluegrass (*?)

POLYGONACEAE, knotweed family

Rumex crispus, curly dock* (along paths)

PRIMULACEAE, primula family

Lysimachia nummularia, moneywort* (abundant in damp soil along paths); a garden plant now well-established at many places in the Platte Valley, from Platte County downstream

RANUNCULACEAE, buttercup family

Anemone canadensis, meadow anemone (common, in flower at woods edge)

Clematis virginiana, eastern Virginís-bower (one vine seen, not yet in flower)

RHAMNACEAE, buckthorn family

Rhamnus cathartica, common buckthorn* (large shrubs; invasive)

ROSACEAE, rose family

Agrimonia gryposepala or A. pubescens, agrimony (not in flower)

Geum canadense, white avens (in woods)

Prunus serotina, black cherry (saplings in woods)

RUBIACEAE, madder family

Galium aparine, cleavers (senescent fruiting plants along paths)

Galium obtusum, bluntleaf bedstraw (common in swampy woods, in flower)

Galium triflorum, sweet-scented bedstraw (common in woods, about to flower)

SALICACEAE, willow family

Populus deltoides, cottonwood (trees throughout the forest, some huge)

Salix amygdaloides, peachleaf willow (trees by the river)

Salix exigua variety interior (=S. interior), sandbar willow (common near Platte River)

SMILACEAE, greenbriar family

Smilax hispida, prickly greenbriar, prickly catbriar (prickly vines in the woods)

SOLANACEAE, nightshade family

Physalis, ground-cherry (unidentified species, not in flower)

TILIACEAE, linden family

Tilia americana, American lindern (many saplings and a few larger trees)

ULMACEAE, elm family

Ulmus americana, American elm (common in the woods)

URTICACEAE, nettle family

Laportea canadensis, wood-nettle (common in the woods)

VIOLACEAE, violet family

Viola sororia, sister violet (in woods)

VITACEAE, grape family

Parthenocissus quinquefolia, Virginia creeper (abundant in the woods and climbing high into the trees)

Vitis riparia, riverbank grape (at woods edge near the river)

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