Plants with flowers not white, yellow, or green
 Pedicularis groenlandica (Elephant Head) |
 Pedicularis macrodonta (Purple Lousewort) |
 Pediomelum argophyllum (Silverleaf Psoralea) |
 Pediomelum esculentum (Indian Breadroot) |
 Penstemon gracilis (Lilac-flowered Beardtongue) |
 Penstemon nitidus (Smooth Blue Beardtongue) |
 Penstemon procerus (Slender Beardtongue) |
 Peritoma serrulata (Pink Cleome) |
 Persicaria amphibia (Water Smartweed) |
 Phacelia franklinii (Franklin's Scorpionweed) |
 Phlox alyssifolia (Blue Phlox) |
 Physostegia ledinghamii (False Dragonhead) |
 Pinguicula villosa (Small Butterwort) |
 Pinguicula vulgaris (Butterwort) |
 Plantago eriopoda (Saline Plantain) |
 Polanisia dodecandra (Clammyweed) |
 Polygala paucifolia (Fringed Milkwort) |
 Polygonum polygaloides ssp. kelloggii (Small Knotweed) |
 Potamogeton natans (Floating Pondweed) |
 Prenanthes alba (White Lettuce) |
 Prenanthes racemosa (Glacuous White Lettuce) |
 Primula incana (Mealy Primrose) |
 Primula mistassinica (Bird's-Eye Primrose, Dwarf Primrose) |
 Prunella vulgaris (Selfheal) |
 Psoralidium lanceolatum (Lance-Leaved Psoralea) |