Ferns, Mosses, et al

Family Equisetaceae
Horse-tail Rush or Scouring Rush (Equisetum hyemale)

Family Ophioglossaceae
Sparse-lobed Grape Fern (Botrychium biternatum)

Family Polypodiaceae
Asian Holly-Fern (Crytomium falcatum)
Resurrection Fern (Polypodium polypodioides)
Ebony Spleenwort (Asplenium platyneuron)

Family Selaginellaceae
Meadow Spikemoss (Selaginella apoda)

Family Thelypteridaceae
Southern Shield Fern (Thelypteris kunthii)
Torres' Fern (Thelypteris torresiana)

Family Woodsiaceae
Sensitive Fern (Onoclea sensibilis)

Vascular Plants

Family Araceae
Green Dragon (Arisaema dracontium)

Family Bromeliaceae
Spanish Moss (Tillandsia usneoides)

Family Commelinaceae
Broad-leaf Dayflower (Commelina virginica)
Spiderwort (Tradescantia ohioensis)

Family Cyperaceae
Caric Sedge (Carex sp.)

Family Iridaceae
Short-stem Iris (Iris brevicaulis)
Blue-eyed Grass (Sisyrinchium sp.)

Family Lemnaceae
Duckweed (Lemna aequinoctialis) 

Family Liliaceae
Canada Onion (Allium canadense)
Spider Lily (Hymenocallis liriosome (previously named H. occidentalis in Family Amaryllidaceae))
Crow Poison or False Garlic (Nothoscordum bivalve)

Family Orchidaceae
Upland Ladies' Tresses (Spiranthes vernalis)

Family Acanthaceae
Lance-leaved Water Willow (Justicia ovata)
Water Willow (Justicia americana)
Wild Petunia (Ruellia caroliniensis)

Family Apocynaceae
Blue Star (Amsonia tabernaemontana)

Family Asteraceae
Giant Ragweed (Ambrosia trifida)
Asters (Aster sp.); several species
Horrid Thistle (Cirsium horridus)
Elephant's Foot (Elephantopus carolinianus)
Showy Daisy Fleabane (Erigeron philadelphicus)
Dog Fennel (Eupatorium capillifolium)
Mist Flower (Eupatorium coelestinum)
White Snakeroot (Eupatorium rugosum)
Rabbit Tobacco (Gnaphalium obtusifolium)
Sump Weed (Iva annua)
Wild Lettuce (Lactuca sp.)
Santa Maria or Wild Quinine (Parthenium hysterophorus)
Goldenrod (Solidago sp.); several species
Prickly Sow Thistle (Sonchus asper)
Gaillardia (Gaillardia aestivalis)
Blazing star (Liatris graminifolia)
Mexican Hat (Ratibida columnaris)
Coreopsis, Tickseed (Coreopsis lanceolata)
False-dandelion (Pyrrhopappus carolinianus)
Horse Weed (Conyza sp.)

Family Berberidaceae
Mayapple; Mandrake (Podophyllum peltatum)

Family Campanulaceae
Cardinal Flower (Lobelia cardinalis)
Venus' Looking Glass (Triodanis perfoliata)

Family Fabaceae
Partridge Pea (Chamaecrista fasciculata, formerly Cassia fasciculata)
Beggar's Ticks (Desmodium glabellum)
Persian Clover (Trifolium resupinatum)
White Dutch Clover (Trifolium repens)
Bladderpod (Glottidium vesicarium)
Coffee Weed (Senna obtusifolia, previously Cassia obtusifolia)

Family Geraniaceae
Wild Geranium (Geranium sp.)

Family Oxalidaceae
Violet Wood Sorrel (Oxalis violacea) 
Common Yellow Wood Sorrel (Oxalis stricta)

Family Plantaginaceae
Common Plantain (Plantago major)

Family Phytolaccaceae
Pokeweed (Phytolacca americana)

Family Polygonaceae
Virginia knot-weed (Polygonum virginianum)
Curlydock (Rumex crispus)
Smartweed (Polygonum hydropiperoides)

Family Rosaceae
Wild Strawberry (Fragaria virginiana)
Indian Strawberry (Duchesnea indica)

Family Rubiaceae
Bedstraw (Galium aparine)
Buttonbush (Cephalanthus occidentalis)
Buttonweed (Diodia virginiana)

Family Solanaceae
Horse-nettle (Solanum carolinense)
Black Nightshade (Solanum nigrum)
Ground-cherry (Physalis heterophylla or angulata)

Family Saururaceae
Lizard's Tail (Saururus cernuus)

Family Verbenaceae
Verbena (Verbena brasiliensis)

Family Violaceae
Bayou Violet (Viola langloisii)
Field-Pansy (Viola rafinesquii)