COMMON NAMES: O - P

[A B C D E F G H I J K L M N O P Q R S T U V W X Y Z]

obedient plant - Physostegia virginiana (L.) Bentham

oblong-leaved aster - Aster lanceolatus Willd. = Symphyotrichum oblongifolium (Nutt.) G. L. Nelson

Ohio buckeye - Aesculus glabra Willd.  var. arguta

Ohio horse mint - Blephilia ciliata (L.) Bentham

old-field balsam - Gnaphalium obtiusifollium L. var. obtusifollium

old-field cinquefoil - Potettilla simplex Michaux

old-field goldenrod - Solidago nemoralis Drylander

old-field toadflax - Nuttalanthus canadensis (L.) D. Sutton

old man's beard - Chionanthus virginicus L.

oleaster - Elaeagnus angustifolia L.

Olney three-square – Schoenoplectus americanus Pers.

one-flowered cancer-root - Orobanche uniflora Nutt.

orange coneflower - Rudbeckia fulgida Aiton.  

orange day lily - Hemerocallis fulva (L.) L.

orange puccoon - Lithospermum canescens (Michaux) Lehm., L. incisum Lehm.

Osage orange - Maclura pomifera (Raf.) C. Schneider  

oswega tea - Monarda didyma L,

overcup oak - Quercus lyrata Walter

ox-eye - Heliopsis helianthoides var. scabra (Dunal) Fern.

ox-eye daisy - Leucanthemum vulgare Lam.

Ozark chestnut - Castanea pumila var. ozarkensis (Ashe) G. Tucker

Ozark chinquapin - Castanea pumila var. ozarkensis (Ashe) G. Tucker

Ozark milk vetch - Astragalus distortus Torrey & A. Gray  

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Ozark wake robin - Trillium pusillum var. ozarkanum (E. J. Palmer & Steyerm.)    Steyerm.

Ozark witch hazel - Hamamelis vernalis Sarg.

pagoda tree - Sophora japonica

painted cup - Castilleja coccinea (L.) Sprengel

pale beard-tongue - Penstemon pallidus Small

pale corydalis - Corydalis flavula (Raf.) DC.

pale dock - Rumex altissimus Alph. Wood

pale gentian - Gentiana flavida A. Gray  

pale gerardia - Agalinis skinneriana (A. W. Wood) Britton

pale purple coneflower - Echinacea pallida (Nutt.) Nutt.

pale seeded plantain - Plantago virginica L.

pale touch-me-not -  Impatiens pallida Nutt.

pale violet - Viola striata Aiton

pale spike lobelia - Lobelia spicata Lam.  

pale touch-me-not - Impatiens pallida Nutt.

palm sedge – Carex muskingumensis Schwein. Schwein.

panic grass - Panicum boscii Poiret  

panicle hydrangea - Hydrangea paniculata

panicle aster - Aster lanceolatus Willd. = Symphyotrichim lanceolatum  (Wild.) G. L. Nesom

pansy violet - Viola pedata L.  

paperbark maple - Acer griseum (Franch.) Pax

Paraguayan purslane - Portulaca amilus Sprreng.

parsnip - Pastinaca sativa L.

partridge berry - Mitchella repens L.  

[A B C D E F G H I J K L M N O P Q R S T U V W X Y Z]

partridge pea - Chamaecrista fasciculata (Michaux) E. Greene

passion flower - Passiflora lutea var. glabriflora Fern.

passion vine - Passiflora incarnata L.

passion vine - Passiflora lutea var. glabriflora Fern.

pawpaw - Asimina triloba (L.) Dunal

peach-leaved dock - Rumex altissimus Alph. Wood

pear - Pyrus communis L.

pedunculate oak - Quercus robus

Pennsylvania smart weed - Polygonum pensylvanicum L.   

pennyroyal - Hedeoma pulgeioides (L.) Pers. 

peppermint - Mentha x piperita L.

perennial pea - Lathyrus latifolius L.

perennial phlox - Phlox paniculata L.

perennial sweet pea - Lathyrus latifolius L. 

perfoliate penny crest - Microthlaspi perfoliatum ((L.) F.K. Mey

periwinkle - Vinca minor L.

persimmon - Diospyros virginiana L.

phacelia - Phacelia hirsuta Nutt.

pickerel weed - Pontederia cordata L.

pigeon grape - Vitis cinera (Engelm.) Egelm Millardet var. cinera

pignut hickory - Carya texana Buckley & Carya ovata (Miller) Sweet

pin clover - Erodium cicutarium (L.) L'Her. ex Aiton  

pin oak - Quercus palustris Muenchh.

pinesap - Monotropa hypopitys L.

pink flowered dogbane - Apocynum androsaemifolium L.

pinkroot - Spigelia marylandica L.

pinkweed - Polygonum pensylvanicum L.

plainleaf pussy toes - Antennaria plantaginifolia (L.) Hook.  

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plains coreopsis - Coreopsis tinctoria Nutt.

plains prickly pear - Opuntia macrorhiza Engelm. var. macrorhiza

plains violet - Viola viarum Pollard

plains wild indigo - Baptisia bracteata var. glabrescens (Larisey) Isely

pleurisy root - Asclepias tuberosa ssp. interior Woodson  

plume grass - Erianthus ravennae (L.) P. Beauv.

poison hemlock - Conium maculatum L.

poison ivy - Toxicodendron radicans (L.) Kuntze

poke - Phytolacca americana L.

pokeweed - Phytolacca americana L.  

possum haw - Ilex decidua Walter

possum wood - Diospyros virginiana L.

post oak - Quercus stellata Wangenh.

prairie anemone - Anemone caroliniana Walter

prairie blue-eyed grass - Sisyrinchium campestre E. Bickn.  

prairie bulrush - Bolboschoenus maritimus ssp. paludosus (A. Nelson) T. Koryana

prairie buttercup - Ranunculus fascicularis Muhlenb. ex Bigelow

prairie coneflower - Ratibida columnifera (Nutt.) Wooton & Standley

prairie coneflower - Ratibida pinnata (Ventenat) Barnhart

prairie cord grass - Spartina pectinata Link

prairie crabapple - Malus ioensis (Alph. Wood) Britton

prairie dock - Silphium terebinthanaceum Jacr.

prairie dogbane - Apocynum cannabinum L.  

prairie goldenrod, Solidago speciosa Nutt.

prairie milkweed - Asclepias hirtella (Pennell) Woodson 

prairie mimosa - Desmanthus illinoensis (Michaux) MacMillan ex Robinson & Fern.

prairie paintbrush - Castilleja coccinea (L.) Sprengel  

[A B C D E F G H I J K L M N O P Q R S T U V W X Y Z]

prairie parsley - Polytaenia nuttallii DC.

prairie phlox - Phlox pilosa L.

prairie rooster bill - Dodecatheon meadia L.

prairie rose - Rosa setigera Michx. var. setigera

prairie willow - Salix humilis Marsh  

prairie tea - Croton monanthogynus Michx.

prickly lettuce - Lactuca serriola L.

prickly sida - Sida spinosa L.

pride-of-India - Koelreutera paniculata,

pride-of-India -Melia azedarach L.

pink queen - Cleoma hasslerisna Chodat

prince's feather - Polygonum orientale L.

prinrose willow - Ludwigia peploides (Humb., Bompl. & Kunth) Raven

prostrate spurge - Chamaesyce paniculata (L.) Small

puccoon - Lithospermum canescens (Michaux) Lehm., L. incisum Lehm.

purple coneflower - Echinacea purpurea (L.) Moenk.

purple daisey - Aster patens Dryander = Symphyotrichum patens (Aiton) G. L. Nesom

purple headed sneezeweed - Helenium flexuosum Raf.

purple loosestrife - Lythrum salicaria L.

purple meadow rue - Thlactrum dasycarpum Fischer & Avé-Lall.

purple milkweed - Asclepias purpurascens L.

Purple poppy mallow - Callirhoe involucrata (Torrey & A. Gray) A. Gray

purple prairie clover - Dalea purpurea Vent.

prairie rose gentian - Sabatia campestris Nutt.

purple trillium - Trillium recurvatum Beck

purple wake robin - Trillium recurvatum Beck

pussy toes - Antennaria plantaginifolia (L.) Hook.  

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