Authors: Jeny Davis

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Families: 165
Genera: 1092
Species: 2615
Total Taxa (details): 2726

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Image source: all images linked voucher images only

Opuntia × curvispina
Seashore Cactus
Oreocereus celsianus
Old Man of the Andes
Origanum majorana
Sweet Marjoram
Orobanche cooperi
desert broomrape
Orobanche ludoviciana
Louisiana Broomrape
Oxalis albicans
Radish-Root Wood-Sorrel
Oxalis albicans subsp. pilosa
radishroot woodsorrel
Oxalis articulata
Windowbox Wood-Sorrel
Oxalis corniculata
Creeping Yellow Wood-Sorrel
Oxalis debilis
Pink Wood-Sorrel
Oxalis pes-caprae
African Wood-Sorrel
Oxalis rubra
windowbox woodsorrel
Oxalis stricta
Upright Yellow Wood-Sorrel
Oxybasis glauca
Oak-Leaf Eurasian-Goosefoot
Pachycereus marginatus
Mexican Fence Post
Pachycereus schottii
senita cactus
Packera multilobata
Lobe-Leaf Groundsel
Packera quercetorum
Oak Creek Groundsel
Palafoxia arida
Desert Palafox
Panicum alatum
winged panicgrass
Panicum alatum var. minus
winged panicgrass
Panicum antidotale
Giant Panic Grass
Panicum dichotomiflorum
Autumn Panic Grass
Panicum hirticaule
Mexican Panic Grass
Panicum miliaceum
Hog Millet
Papaver orientale
Oriental Poppy
Papaver rhoeas
Corn Poppy
Papaver somniferum
Opium Poppy
Pappostipa speciosa
Desert Needle Grass
Parietaria floridana
Florida Pellitory
Parietaria hespera
rillita pellitory
Parietaria pensylvanica
Rillita Pellitory
Parkinsonia sp.
paloverde
Parkinsonia aculeata
Mexican Palo-Verde
Parkinsonia florida
Blue Palo-Verde
Parkinsonia microphylla
Yellow Palo-Verde
Parthenice mollis
Annual Monsterwort
Parthenium hysterophorus
Santa Maria Feverfew
Paspalum dilatatum
Golden Crown Grass
Paspalum distichum
Jointed Crown Grass
Passiflora arida
Desert Passion-Flower
Passiflora arizonica
Arizona Passion-Flower
Passiflora caerulea
Blue-Crown Passion-Flower
Passiflora edulis
Purple Granadilla
Passiflora incarnata
Purple Passion-Flower
Image
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available
Paulownia tomentosa
Princesstree
Pectis cylindrica
Sonoran Chinchweed
Pectis linifolia
Romero-Macho
Pectis papposa
Many-Bristle Chinchweed
Pectis papposa var. papposa
manybristle cinchweed
Pectis prostrata
Spreading Chinchweed
Pectis rusbyi
Rusby's Chinchweed
Pectocarya heterocarpa
Chuckwalla Combseed
Pectocarya platycarpa
Broad-Fruit Combseed
Pectocarya recurvata
Curve-Nut Combseed
Pectocarya setosa
Bristly Combseed
Pediomelum megalanthum
Intermountain Indian-Breadroot
Pediomelum megalanthum var. retrorsum
Intermountain Indian breadroot
Pelargonium graveolens
Sweet-Scented-Geranium
Pellaea atropurpurea
Purple-Stem Cliffbrake
Pellaea truncata
Spiny Cliffbrake
Peniocereus greggii
Night-Blooming-Cereus
Pennisetum advena
purple fountaingrass
Pennisetum ciliare
Buffel Fountain Grass
Pennisetum glaucum
Pearl Millet
Pennisetum setaceum
Crimson Fountain Grass
Penstemon barbatus
Beard-Lip Beardtongue
Penstemon eatonii
Eaton's Firecracker
Penstemon leiophyllus
Smooth-Leaf Beardtongue
Penstemon palmeri
Scented Beardtongue
Penstemon parryi
Parry's Beardtongue
Penstemon pseudospectabilis
Rosy Desert Beardtongue
Penstemon subulatus
Hackberry Beardtongue
Penstemon thurberi
Thurber's Beardtongue
Penstemon virgatus
Upright Blue Beardtongue
Pentagramma maxonii
Desert Gold Fern
Pentagramma triangularis
Western Gold Fern
Pentas lanceolata
Egyptian Starcluster