Genus names beginning with P:
230 genera
963 species
151 subspecies and varieties
963 species
151 subspecies and varieties
Show only taxa with photos
Pachycudonia (1 species)
Pachyella (2 species)
Pachylepyrium (1 species)
Pachyphloeus (1 species)
Packera – butterweed (12 species)
Packera – groundsel (12 species)
Paeonia – peony (1 species)
Panaeolina (1 species)
Panaeolus (5 species)
Panellus (4 species)
Panicum – panic grass (6 species)
Panicum – witchgrass (6 species)
Pannaria (2 species)
Papaver – poppy (4 species)
Paraeccilia (3 species)
Parameconopsis (1 species)
Parapholis – sickle-grass (1 species)
Parasola (1 species)
Parietaria – pellitory (2 species)
Parmelia (7 species)
Parmeliella (3 species)
Parmeliopsis (2 species)
Parmotrema (5 species)
Parnassia – grass-of-parnassus (5 species)
Parthenocissus – Virginia creeper (1 species)
Parthenocissus – woodbine (1 species)
Pascopyrum – wheatgrass (1 species)
Paspalum (1 species)
Pastinaca – parsnip (1 species)
Paulownia – princess tree (1 species)
Paxillus (1 species)
Paxistima (1 species)
Pectiantia – mitrewort (1 species)
Pectocarya – combseed (2 species)
Pectocarya – pectocarya (2 species)
Pedicularis – lousewort (7 species)
Pedicularis – pedicularis (7 species)
Pediocactus – ball cactus (1 species)
Peganum – harmal (1 species)
Pellaea – cliff-brake (4 species)
Peltandra – arrow arum (1 species)
Peltigera (28 species)
Peniophora (9 species)
Peniophorella (2 species)
Penstemon – beardtongue (30 species)
Penstemon – penstemon (30 species)
Pentaglottis – alkanet (1 species)
Pentagramma – gold-back fern (1 species)
Penthorum – ditch stonecrop (1 species)
Perenniporia (4 species)
Perideridia – false-caraway (2 species)
Perideridia – yampah (2 species)
Perilla (1 species)
Peritoma – beeplant (2 species)
Peritoma – cleome (2 species)
Peritoma – spiderflower (2 species)
Perrotia (1 species)
Persicaria – knotweed (7 species)
Persicaria – smartweed (7 species)
Persicaria – tearthumb (7 species)
Pertusaria (11 species)
Pestalopezia (1 species)
Petasites – butterbur (2 species)
Petasites – coltsfoot (2 species)
Petrophytum – rockmat (3 species)
Petroselinum – parsley (1 species)
Pezicula (2 species)
Peziza (18 species)
Phacelia – phacelia (14 species)
Phacopsis (1 species)
Phaeocalicium (2 species)
Phaeoceros (3 species)
Phaeocollybia (17 species)
Phaeographis (3 species)
Phaeolepiota (1 species)
Phaeolus (1 species)
Phaeomarasmius (1 species)
Phaeophyscia (8 species)
Phaeopyxis (1 species)
Phaeorrhiza (2 species)
Phalaris – canarygrass (2 species)
Phallus (1 species)
Phanerochaete (5 species)
Phegopteris – beechfern (1 species)
Phellinidium (3 species)
Phellinus (8 species)
Phellodon (3 species)
Phellopilus (1 species)
Phemeranthus – fameflower (2 species)
Phialina (1 species)
Philadelphus – mockorange (1 species)
Philadelphus – syringa (1 species)
Phlebia (7 species)
Phleum – Timothy (2 species)
Phlox – phlox (10 species)
Phlox – wild sweet-william (10 species)
Phlyctis (2 species)
Phoenicaulis – daggerpod (1 species)
Pholiota (40 species)
Photinia – redtip (1 species)
Phragmites – reed (1 species)
Phylliscum (1 species)
Phyllodoce – mountain-heath (3 species)
Phylloporia (1 species)
Phylloporus (2 species)
Phyllospadix – surf-grass (3 species)
Phyllotopsis (1 species)
Physalis – ground-cherry (2 species)
Physaria – bladderpod (6 species)
Physaria – double bladderpod (6 species)
Physaria – twinpod (6 species)
Physcia (16 species)
Physciella (1 species)
Physconia (6 species)
Physisporinus (2 species)
Physocarpus – ninebark (2 species)
Physostegia – physostegia (1 species)
Phyteuma (1 species)
Phytolacca – pokeberry (1 species)
Picea – spruce (3 species)
Picris – oxtongue (1 species)
Picris – picris (1 species)
Piloderma (2 species)
Pilophorus (4 species)
Pilularia – pillwort (1 species)
Pimpinella – pimpinella (0 species)
Pinguicula – butterwort (1 species)
Pinus – pine (4 species)
Piptatheropsis – piptatherum (1 species)
Piptoporus (1 species)
Pirex (1 species)
Pisolithus (1 species)
Pisum (1 species)
Pithya (2 species)
Pityopus – pine-foot (1 species)
Pityopus – pityopus (1 species)
Placidium (2 species)
Placopsis (1 species)
Placopyrenium (1 species)
Placynthiella (3 species)
Placynthium (4 species)
Plagiobothrys – plagiobothrys (8 species)
Plagiobothrys – popcorn-flower (8 species)
Plagiochila (2 species)
Plantago – plantain (9 species)
Platanthera – bog-orchid (13 species)
Platanthera – piperia (13 species)
Platanthera – rein-orchid (13 species)
Platanus (2 species)
Platismatia (6 species)
Plectania (4 species)
Plectritis – plectritis (4 species)
Pleiacanthus – skeletonweed (1 species)
Pleopsidium (2 species)
Pleuricospora – fringed-pinesap (1 species)
Pleuricospora – Sierra-sap (1 species)
Pleurocybella (1 species)
Pleuropogon – pleuropogon (1 species)
Pleuropogon – semaphoregrass (1 species)
Pleurotus (4 species)
Plicaria (2 species)
Plicatura (1 species)
Plicaturopsis (1 species)
Pluteus (16 species)
Poa – bluegrass (32 species)
Podagrostis – bent (3 species)
Podagrostis – bentgrass (3 species)
Podophacidium (1 species)
Polanisia – clammyweed (0 species)
Polemonium – Jacob's-ladder (8 species)
Polemonium – polemonium (8 species)
Polemonium – sky-pilot (8 species)
Polycarpon – manyseed (1 species)
Polycauliona (4 species)
Polychidium (2 species)
Polycoccum (1 species)
Polyctenium – combleaf (1 species)
Polydesmia (1 species)
Polygala – milkwort (1 species)
Polygonum – doorweed (16 species)
Polygonum – knotweed (16 species)
Polygonum – smartweed (16 species)
Polyozellus (1 species)
Polypodium – polypody (4 species)
Polypogon – beard-grass (4 species)
Polypogon – polypogon (4 species)
Polyporoletus (2 species)
Polyporus (11 species)
Polysporina (2 species)
Polystichum – holly-fern (14 species)
Polystichum – sword-fern (14 species)
Pontederia (1 species)
Populus – aspen (6 species)
Populus – cottonwood (6 species)
Populus – poplar (6 species)
Porella (4 species)
Porina (1 species)
Porodaedalea (3 species)
Porotheleum (1 species)
Porphyrellus (1 species)
Porpidia (11 species)
Portulaca (1 species)
Postia (1 species)
Potamogeton – pondweed (19 species)
Potentilla – cinquefoil (22 species)
Potentilla – five-finger (22 species)
Poteridium – American burnet (1 species)
Poteridium – western burnet (1 species)
Poterium – fodder burnet (1 species)
Poterium – garden burnet (1 species)
Poterium – salad burnet (1 species)
Poterium – small burnet (1 species)
Pouzarella (3 species)
Primula – primrose (8 species)
Prosartes – fairy-bell (3 species)
Protogautieria (1 species)
Protopannaria (1 species)
Protoparmelia (2 species)
Prunella – all-heal (1 species)
Prunella – self-heal (1 species)
Prunus – cherry (18 species)
Prunus – laurel (18 species)
Prunus – plum (18 species)
Psathyrella (79 species)
Psathyrostachys (1 species)
Pseudaleuria (1 species)
Pseudelymus (1 species)
Pseudephebe (2 species)
Pseudoarmillariella (1 species)
Pseudochaete (0 species)
Pseudociboria (1 species)
Pseudoclitocybe (1 species)
Pseudocyphellaria (6 species)
Pseudognaphalium – cudweed (5 species)
Pseudohydnum (1 species)
Pseudombrophila (1 species)
Pseudomerulius (1 species)
Pseudoomphalina (2 species)
Pseudoplectania (2 species)
Pseudoroegneria – wheatgrass (1 species)
Pseudostellaria – starwort (1 species)
Pseudotomentella (5 species)
Pseudotsuga – Douglas fir (1 species)
Pseudotsuga – Oregon pine (1 species)
Psilocarphus – woolly-heads (4 species)
Psilocarphus – woolly-marbles (4 species)
Psilocybe (29 species)
Psilolechia (2 species)
Psora (10 species)
Psoroma (1 species)
Psorula (1 species)
Pteridium – bracken (1 species)
Pteridium – brake-fern (1 species)
Pterospora – Albany-beechdrops (1 species)
Pterospora – pinedrops (1 species)
Ptilidium (3 species)
Puccinellia – alkaligrass (5 species)
Pueraria (1 species)
Pulmonaria (0 species)
Pulvinula (2 species)
Punctelia (3 species)
Purshia – antelope-brush (1 species)
Purshia – bitter-brush (1 species)
Pycnoporellus (2 species)
Pycnoporus (1 species)
Pyracantha – firethorn (2 species)
Pyrenocollema (1 species)
Pyrenopeziza (3 species)
Pyrenula (1 species)
Pyrofomes (1 species)
Pyrola – pyrola (7 species)
Pyrola – shinleaf (7 species)
Pyrola – wintergreen (7 species)
Pyronema (1 species)
Pyrrhospora (4 species)
Pyrrocoma – goldenweed (4 species)
Pyrus – pear (1 species)
