Poinciana, Mexican 'Poinsett' Flowering Dogwood
Poinsettia (spp.) Poinsettia 'Peterstar Silver Bells'
Poinsettia 'V-14 Pink' Poinsettia 'V-17 Angelika White'
Poinsettia 'Winter Rose' Poinsettia, Japanese (spp.)
Poinsettia, Japanese 'Yokoi's White' Point Reyes Ceanothus
Point Reyes Ceanothus: gloriosus Point Reyes Creeper
Point Reyes Creeper: gloriosus Poison Ivy
Poison Mercury Poison Oak, Western
Poison Sumac Poisontree, Florida
Poisonwood Poisonwood, Black
Poke (spp.) Pokeweed (spp.)
Polemonium, Creeping Polygala, Fringed
Pond Apple Pond Cypress (spp.)
Pond Cypress 'Morris (Debonair)' Pond Cypress 'Prairie Sentinel'
Pond Lily (spp.) Pond Pine
Pondcypress (spp.) Pondcypress 'Morris (Debonair)'
Pondcypress 'Prairie Sentinel' Ponderosa Pine
Pondweed Ponil
Ponytail Grass Ponytail Palm
Pop Ash Poplar, Fremont
Poplar, Necklace Poplar, Tulip (spp.)
Poplar, Tulip 'Arnold' Poplar, Yellow (spp.)
Poplar, Yellow 'Arnold' Poplar: dimorpha
Poplar: monticola Poppy Mallow, Finger
Poppy, Arctic (spp.) Poppy, Arctic 'Champagne Bubbles'
Poppy, Arctic 'Wonderland Mix' Poppy, Bush
Poppy, California (spp.) Poppy, California Tree
Poppy, California 'Ballerina' Poppy, California 'Thai Silk'
Poppy, California White Poppy, Celandine
Poppy, Desert Gold Poppy, Golden (spp.)
Poppy, Golden 'Ballerina' Poppy, Golden 'Thai Silk'
Poppy, Golden White Poppy, Iceland (spp.)
Poppy, Iceland 'Champagne Bubbles' Poppy, Iceland 'Wonderland Mix'
Poppy, Island Tree Poppy, Matilja
Poppy, Mexican Gold Poppy, Mexican Tulip (spp.)
Poppy, Mexican Tulip 'Sunlite' Poppy, Prickly
Poppy, Rough Seeded California Poppy, Wood
Poppy: coulteri, California Tree 'Popsicle' Lupine
Pork and Beans Port Orford Cedar (spp.)
Port Orford Cedar 'Aurea Densa' Port Orford Cedar 'Columnaris'
Port Orford Cedar 'Erecta' Port Orford Cedar 'Fletcheri'
Port Orford Cedar 'Globosa Nana' Port Orford Cedar Golden
Port Orford Cedar Golden Port Orford Cedar 'Green Pillar'
Port Orford Cedar 'Intertexta' Port Orford Cedar 'Lane'
Port Orford Cedar 'Lane's Aurea' Port Orford Cedar 'Minima Aurea'
Port Orford Cedar 'Pembury Blue' Port Orford Cedar 'Pottenii'
Port Orford Cedar 'Triomf van Boskoop' Port Orford Cedar 'Wisselii'
Port Orford Cedar 'Yvonne'