Flora of Philadelphia
Locality: Philadelphia, Pennsylvania

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Families: 176
Genera: 833
Species: 2132
Total Taxa: 2187

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Image source: all images linked voucher images only

Onopordum acanthium
Scotch-Thistle
Ophioglossum crotalophoroides
Bulbous Adder's-Tongue
Ophioglossum vulgatum
Southern Adder's-Tongue
Oplotheca floridana
Plains Snake-Cotton
Opuntia engelmannii
Cactus-Apple
Opuntia humifusa
Eastern Prickly-Pear
Orchis spectabilis
Showy Orchid
Origanum vulgare
Wild Marjoram
Ornithogalum nutans
Drooping Star-of-Bethlehem
Ornithopus perpusillus
Little White Bird's-Foot
Orobanche uniflora
Naked Broomrape
Osmorhiza claytoni
Hairy Sweet-Cicely
Osmunda cinnamomea
Cinnamon Fern
Osmunda claytoniana
Interrupted Fern
Osmunda regalis
Royal Fern
Ostrya virginiana
Eastern Hop-Hornbeam
Oxalis corniculata
Creeping Yellow Wood-Sorrel
Oxalis florida
Flowering Yellow Wood-Sorrel
Oxalis fontana
Upright Yellow Wood-Sorrel
Oxalis stricta
Upright Yellow Wood-Sorrel
Oxalis violacea
Violet Wood-Sorrel
Oxypolis rigidior
Stiff Cowbane
Pachysandra terminalis
Japanese Moutain-Spurge
Packera obovata
Round-Leaf Groundsel
Packera paupercula
Balsam Groundsel
Panax quinquefolius
American Ginseng
Panax trifolius
Dwarf Ginseng
Panicum agrostoides
Red-Top Cut-Throat Grass
Panicum amarum
Bitter Panic Grass
Panicum anceps
Beaked Cut-Throat Grass
Panicum capillare
Common Panic Grass
Panicum columbianum
Columbia Witch Grass
Panicum dichotomiflorum
Autumn Panic Grass
Panicum gattingeri
Gattinger's Panic Grass
Panicum lanuginosum
Western Witch Grass
Papaver argemone
Long Prickly-Head Poppy
Papaver dubium
Blindeyes
Papaver hybridum
Round Prickly-Head Poppy
Papaver orientale
Oriental Poppy
Papaver rhoeas
Corn Poppy
Papaver somniferum
Opium Poppy
Paronychia canadensis
Smooth Forked Nailwort
Paronychia fastigiata
Hairy Forked Nailwort
Passiflora lutea
Yellow Passion-Flower
Pastinaca sativa
Wild Parsnip
Paulownia tomentosa
Princesstree
Pedicularis canadensis
Canadian Lousewort
Pedicularis lanceolata
Swamp Lousewort
Pellaea glabella
Smooth Cliffbrake
Peltandra virginica
Green Arrow-Arum
Penstemon digitalis
Foxglove Beardtongue
Penstemon hirsutus
Hairy Beardtongue
Pentalinon luteum
Hammock Viper's-Tail
Penthorum sedoides
Ditch-Stonecrop
Perilla frutescens
Beefsteakplant
Petasites vulgaris
Pestilence-Wort
Petrorhagia prolifera
Childing-Pink
Phacelia purshii
Miami-Mist
Phaseolus vulgaris
Kidney Bean
Phegopteris connectilis
Narrow Beech Fern
Phegopteris hexagonoptera
Broad Beech Fern
Philadelphus coronarius
Sweet Mock Orange
Philadelphus inodorus
Scentless Mock Orange
Phlox bifida
Cleft Phlox
Phlox divaricata
Wild Blue Phlox
Phlox maculata
Wild Sweetwilliam
Phlox paniculata
Fall Phlox
Phlox pilosa
Downy Phlox
Phryma leptostachya
American Lopseed
Phyla lanceolata
Northern Frogfruit
Phyllanthus abnormis
Drummond's Leaf-Flower
Phyllanthus carolinensis
Carolina Leaf-Flower
Physalis heterophylla
Clammy Ground-Cherry