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Scientific names

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Obolaria virginica
Virginia Pennywort
Oenothera biennis
Biennial Evening-primrose
Oenothera humifusa
Sea-beach Evening-primrose
Oenothera laciniata
Cutleaf Evening-primrose
Oenothera parviflora
Small Flowered Evening-primrose
Oenothera perennis
Perennial Evening-primrose
Onoclea sensibilis
Sensitive Fern
Ophioglossum pycnostichum
Southern Adder's-tongue
Ophioglossum vulgatum
Southern Adder's-tongue
Opuntia humifusa var. humifusa
Eastern Prickly-pear Cactus
Orchis spectabilis
Showy Orchis
Ornithogalum umbellatum
Star-of-bethlehem
Orobanche uniflora
One-flowered Broomrape
Orontium aquaticum
Golden Club
Orthotrichum ohioense
Ohio Bristle Moss
Orthotrichum stellatum
Bald Bristle Moss
Osmorhiza claytonii
Bland Sweet-cicely
Osmorhiza longistylis
Scented Sweet-cicely
Osmunda cinnamomea
Cinnamon Fern
Osmunda claytoniana var. claytoniana
Interrupted Fern
Osmunda regalis var. spectabilis
Royal Fern
Osmundastrum cinnamomeum var. cinnamomeum
Cinnamon Fern
Oxalis corniculata
Creeping Woodsorrel
Oxalis dillenii
Southern Yellow Woodsorrel
Oxalis dillenii subsp. filipes
Southern Yellow Woodsorrel
Oxalis florida
Southern Yellow Woodsorrel
Oxalis stricta
Upright Yellow Woodsorrel
Oxalis violacea
Violet Woodsorrel