| Scientific Name |
Common Name |
Native Status |
|
|
|
|
|
Obolaria virginica L.
|
Pennywort |
N |
|
Oclemena acuminata (Michx.) Greene
|
Whorled Wood Aster |
N |
|
Odontoschisma denudatum (Nees) Dumort.
|
|
N |
|
Odontoschisma sphagni (Dicks.) Dumort.
|
|
N |
|
Oenanthe javanica (Blume) DC
|
Water Celery, Java Water Dropwort |
I |
|
Oenothera argillicola Mackenzie
|
Shale Barren Evening-primrose |
N |
|
Oenothera biennis L.
|
Common Evening-primrose |
N |
|
Oenothera curtiflora W.L. Wagner & Hoch
|
Small-flowered Gaura |
I |
|
Oenothera fruticosa L.
|
Narrow-leaf Sundrops, Southern Sundrops |
N |
|
Oenothera gaura W.L. Wagner & Hoch
|
Biennial Gaura, Northeastern Gaura |
N |
|
Oenothera humifusa Nuttall
|
Sea-beach Evening-primrose |
N |
|
Oenothera laciniata Hill
|
Cutleaf Evening-primrose |
N |
|
Oenothera linifolia Nuttall
|
Threadleaf Sundrops, Flaxleaf Sundrops |
I |
|
Oenothera parviflora L.
|
Small-flowered Evening-primrose |
N |
|
Oenothera perennis L.
|
Small Sundrops, Little Sundrops |
N |
|
Oenothera pilosella Raf. ssp. pilosella
|
Meadow Evening-primrose, Prairie Sundrops |
N |
|
Oenothera riparia Nuttall
|
Riverbank Evening Primrose |
N |
|
Oenothera speciosa Nuttall
|
Pink Evening-primrose, Showy Evening-primrose, Pink-ladies |
I |
|
Oenothera tetragona Roth
|
Sundrops |
N |
|
Oenothera triloba Nuttall
|
Stemless Evening Primrose |
I |
|
Oldenlandia boscii (DC) Chapman
|
Bosc's Bluets |
N |
|
Oldenlandia corymbosa L.
|
Diamond-flower |
I |
|
Oncophorus rauei (Austin) Grout
|
|
N |
|
Oncophorus virens (Hedw.) Brid.
|
|
N |
|
Oncophorus wahlenbergii Brid.
|
|
N |
|
Onoclea sensibilis L.
|
Sensitive Fern, Bead Fern |
N |
|
Onopordum acanthium L. ssp. acanthium
|
Scotch Thistle, Cotton Thistle |
I |
|
Ophioglossum engelmannii Prantl
|
Limestone Adder's-tongue, Engelmann's Adder's-tongue |
N |
|
Ophioglossum petiolatum Hook.
|
Long-stem Adder's-tongue |
I |
|
Ophioglossum pusillum Raf.
|
Northern Adder's-tongue |
N |
|
Ophioglossum pycnostichum (Fernald) A. & D. Love
|
Southern Adder's-tongue |
N |
|
Oplismenus undulatifolius (Ard.) P. Beauv.
|
Wavyleaf Basketgrass, Wavyleaf Grass |
I |
|
Opuntia cespitosa Raf.
|
|
N |
|
Opuntia humifusa (Raf.) Raf.
|
Eastern prickly-pear |
N |
|
Opuntia humifusa complex
|
Eastern Prickly-pear |
N |
|
Opuntia mesacantha Raf. ssp. mesacantha
|
|
N |
|
Orbexilum onobrychis (Nutt.) Rydb.
|
Lance-leaf Scurfpea, French-grass |
N |
|
Orbexilum psoralioides (Walter) Vincent
|
Sampson's Snakeroot |
N |
|
Oreojuncus trifidus (L.) Záveská Drábková & Kirschner
|
Highland Rush |
N |
|
Origanum vulgare L.
|
Wild Marjoram |
I |
|
Ornithogalum nutans L.
|
Drooping Star-of-Bethlehem |
I |
|
Ornithogalum umbellatum L.
|
Common Star-of-Bethlehem |
I |
|
Orobanche minor J.E. Smith
|
Common Broomrape, Lesser Broomrape, Small Broomrape |
I |
|
Orontium aquaticum L.
|
Golden Club |
N |
|
Orthilia secunda (L.) House
|
One-sided Shinleaf, One-sided Pyrola |
N |
|
Orthotrichum anomalum Hedw.
|
|
N |
|
Orthotrichum elegans Schwägr. ex Hook. & Grev.
|
|
N |
|
Orthotrichum exiguum Sullivant
|
|
N |
|
Orthotrichum keeverae H.A. Crum & L.E. Anderson
|
Keever's Bristle Moss |
N |
|
Orthotrichum lescurii Austin
|
|
N |
|
Orthotrichum ohioense Sullivant & Lesquereux
|
|
N |
|
Orthotrichum pumilum Swartz
|
|
N |
|
Orthotrichum pusillum Mitten
|
|
N |
|
Orthotrichum stellatum Bridel
|
|
N |
|
Orthotrichum strangulatum P. Beauv.
|
|
N |
|
Orychophragmus violaceus (L.) O.E. Schulz
|
Chinese Violet Cress |
I |
|
Oryzopsis asperifolia Michx.
|
Rough-leaved Ricegrass, White-grained Mountain Ricegrass |
N |
|
Oshuna crassipes (Martius) A. Haines
|
Water Hyacinth |
I |
|
Osmanthus heterophyllus D. Don
|
Holly Osmanthus |
I |
|
Osmorhiza claytonii (Michx.) C.B. Clarke
|
Sweet Cicely |
N |
|
Osmorhiza longistylis (Torr.) DC.
|
Aniseroot |
N |
|
Osmunda spectabilis Willd.
|
Royal Fern |
N |
|
Osmunda × ruggii R. Tryon
|
|
N |
|
Osmundastrum cinnamomeum (L.) C. Presl var. cinnamomeum
|
Cinnamon Fern |
N |
|
Osmundastrum cinnamomeum (L.) C. Presl var. glandulosum (Waters) McAvoy
|
Glandular Cinnamon Fern |
N |
|
Ostrya virginiana (P.Mill.) K.Koch
|
Hop-hornbeam, Eastern Hop-hornbeam, Ironwood |
N |
|
Oxalis articulata Savigny
|
Red Wood-sorrel |
I |
|
Oxalis colorea (Small) Fedde
|
Small's Wood-sorrel |
N |
|
Oxalis corniculata L.
|
Creeping Wood-sorrel |
|
|
Oxalis dillenii Jacquin
|
Southern Yellow Wood-sorrel |
N |
|
Oxalis florida Salisbury
|
Slender Yellow Wood-sorrel |
N |
|
Oxalis grandis Small
|
Great Yellow Wood-sorrel |
N |
|
Oxalis montana Raf.
|
Mountain Wood-sorrel, White Wood-sorrel |
N |
|
Oxalis stricta L.
|
Common Yellow Wood-sorrel |
N |
|
Oxalis violacea L.
|
Violet Wood-sorrel |
N |
|
Oxybasis glauca (L.) Fuentes
|
Oakleaf Goosefoot |
I |
|
Oxydendrum arboreum (L.) DC.
|
Sourwood, Sorrel Tree |
N |
|
Oxypolis rigidior (L.) Raf.
|
Cowbane, Stiff Cowbane |
N |
|
Oxypolis ternata (Nutt.) Heller
|
Savanna Cowbane |
N |
|
Oxyrrhynchium hians (Hedw.) Loeske
|
|
N |