Authors: Wendy C. Hodgson, Andrew Salywon, Raul Puente

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Families: 106
Genera: 516
Species: 1110
Total Taxa (details): 1150

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Oenothera sp.
evening primrose
Oenothera caespitosa
Tufted Evening-Primrose
Oenothera caespitosa var. marginata
tufted evening primrose
Oenothera flava
Long-Tube Evening-Primrose
Oenothera primiveris
Yellow-Flower Desert Evening-Primrose
Oenothera rosea
Rose Evening-Primrose
Oenothera suffrutescens
Scarlet Evening-Primrose
Opuntia sp.
pricklypear
Opuntia chlorotica
Clock-Face Prickly-Pear
Opuntia engelmannii
Cactus-Apple
Opuntia macrorhiza
Twist-Spine Prickly-Pear
Opuntia phaeacantha
Tulip Prickly-Pear
Opuntia phaeacantha var. major
sprawling prickly pear
Orthocarpus luteus
Golden-Tongue Owl-Clover
Orthocarpus purpureoalbus
Purple-White Owl-Clover
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Ostrya knowltonii
Knowlton's Hop-Hornbeam
Oxalis albicans
Radish-Root Wood-Sorrel
Oxalis drummondii
Drummond's Wood-Sorrel
Oxytropis oreophila
Mountain Locoweed
Packera neomexicana
New Mexico Groundsel
Packera quercetorum
Oak Creek Groundsel
Packera werneriifolia
Rocky Alpine Groundsel
Panicum bulbosum
bulb panicgrass
Panicum capillare
Common Panic Grass
Panicum hallii
Hall's Panic Grass
Panicum hirticaule
Mexican Panic Grass
Panicum obtusum
Vine-Mesquite
Parietaria hespera
rillita pellitory
Parkinsonia florida
Blue Palo-Verde
Pectocarya platycarpa
Broad-Fruit Combseed
Pectocarya recurvata
Curve-Nut Combseed
Pedicularis centranthera
Dwarf Lousewort
Pellaea intermedia
Intermediate Cliffbrake
Pellaea longimucronata
Spiny Cliffbrake
Pellaea truncata
Spiny Cliffbrake
Peniocereus greggii
Night-Blooming-Cereus
Pennisetum setaceum
Crimson Fountain Grass
Penstemon barbatus
Beard-Lip Beardtongue
Penstemon bridgesii
Beaked Beardtongue
Penstemon linarioides
Toadflax Beardtongue
Penstemon palmeri
Scented Beardtongue
Penstemon parryi
Parry's Beardtongue
Penstemon pseudoputus
Kaibab Plateau Beardtongue
Penstemon pseudospectabilis
Rosy Desert Beardtongue
Penstemon rydbergii
Meadow Beardtongue
Penstemon stenophyllus
Sonoran Beardtongue
Penstemon subulatus
Hackberry Beardtongue
Perityle congesta
Grand Canyon Rockdaisy
Perityle coronopifolia
Crow-Foot Rockdaisy
Perityle emoryi
Emory's Rockdaisy
Petrophyton caespitosum
mat rockspirea
Phacelia affinis
Limestone Scorpion-Weed
Phacelia crenulata
Notch-Leaf Scorpion-Weed
Phacelia crenulata var. crenulata
cleftleaf wildheliotrope
Phacelia cryptantha
Hidden-Flower Scorpion-Weed
Phacelia distans
Distant Scorpion-Weed
Phacelia distans var. australis
Distant Scorpion-Weed
Phacelia egena
Kaweah River phacelia
Phacelia heterophylla
Variable-Leaf Scorpion-Weed
Phacelia ivesiana
Ives' Scorpion-Weed
Phacelia ramosissima
Branched Scorpion-Weed
Phaseolus angustissimus
Narrow-Leaflet Bean
Phaseolus filiformis
Slimjim Bean
Phaseolus ritensis
Santa Rita Mountain Bean
Philadelphus argenteus
silver mock orange
Phleum pratense
Common Timothy
Phlox austromontana
Desert Mountain Phlox
Phlox gracilis
Annual-Phlox
Phlox tenuifolia
Santa Catalina Mountain Phlox
Pholistoma auritum
Blue Fiesta-Flower
Phoradendron californicum
Mesquite Mistletoe
Phoradendron juniperinum
Juniper Mistletoe
Phoradendron villosum
Pacific Mistletoe
Physalis fendleri
Fendler's groundcherry
Physalis hederaefolia
Ivy-Leaf Ground-Cherry
Physalis hederifolia
Ivy-Leaf Ground-Cherry
Physalis hederifolia var. fendleri
Fendler's groundcherry
Physalis longifolia
Long-Leaf Ground-Cherry
Physalis solanaceus
netted globecherry
Physaria sp.
twinpod
Physaria fendleri
Fendler's Bladderpod
Physaria gordonii
Gordon's Bladderpod
Physaria kingii
Wallowa Bladderpod
Picea engelmannii
Engelmann's Spruce
Picea pungens
Blue Spruce
Pinus monophylla
Single-Leaf Pinyon
Pinus ponderosa
Ponderosa Pine
Pinus strobiformis
Southwestern White Pine
Piptochaetium fimbriatum
Pinyon Spear Grass
Piptochaetium pringlei
Pringle's Spear Grass
Pistacia atlantica
Mt. Atlas Mastictree
Plagiobothrys arizonicus
Arizona Popcorn-Flower
Plagiobothrys pringlei
Pringle's Popcorn-Flower
Plagiobothrys tenellus
Pacific Popcorn-Flower
Plantago lanceolata
English Plantain
Plantago ovata
Blond Plantain
Plantago patagonica
Woolly Plantain
Plantago rhodosperma
Red-Seed Plantain
Platanus wrightii
Arizona Sycamore
Platystemon californicus
California Creamcups
Pluchea sericea
Arrow-Weed
Poa bigelovii
Bigelow's Blue Grass
Poa fendleriana
Mutton Grass