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Paeonia 'Buckeye Belle' (d)
Paeonia 'Coral Sunset'
Paeonia lactiflora 'Alexander Fleming'
Paeonia lactiflora 'Avalanche'
Paeonia lactiflora 'Bowl of Beauty' AGM
Paeonia lactiflora 'Bowl of Cream'
Paeonia lactiflora 'Duchesse de Nemours' AGM
Paeonia lactiflora 'Festiva Maxima' AGM
Paeonia lactiflora 'Kansas'
Paeonia lactiflora 'Lady Alexandra Duff' AGM
Paeonia lactiflora 'Primevère'
Paeonia lactiflora 'Red Sarah Bernhardt'
Paeonia lactiflora 'Sarah Bernhardt' AGM
Paeonia lactiflora 'Solange'
Paeonia lactiflora 'Sorbet'
Paeonia ludlowii (S) AGM
Paeonia 'Red Magic'
Pandorea pandorana
Panicum virgatum
Panicum virgatum 'Dallas Blues'
Panicum virgatum 'Heavy Metal'
Panicum virgatum 'Shenandoah'
Papaver orientale (Goliath Group) 'Beauty of Livermere'
Papaver orientale 'Aglaja' AGM
Papaver orientale 'Black and White' AGM
Papaver orientale 'Cedar Hill'
Papaver orientale 'Cedric Morris' AGM
Papaver orientale 'Charming' pink-flowered
Papaver orientale 'Harvest Moon' (d)
Papaver orientale 'Indian Chief'
Papaver orientale 'Kleine Tänzerin'
Papaver orientale 'Patty's Plum'
Papaver orientale 'Perry's White'
Papaver orientale 'Pinnacle'
Papaver orientale 'Raspberry Queen'
Papaver orientale 'Rembrandt'
Papaver orientale 'Royal Chocolate Distinction'
Papaver orientale 'Ruffled Patty'
Papaver orientale 'Tiffany'
Papaver orientale 'Türkenlouis'
Papaver orientale 'Watermelon'
Pelargonium acetosum
Pelargonium 'Apple Blossom Rosebud' (Z/d) AGM
Pelargonium 'Ardens'
Pelargonium 'Brunswick' (Sc)
Pelargonium 'Dark Secret' (R)
Pelargonium 'Delli' (R)
Pelargonium 'Fandango' (Z/St)
Pelargonium 'Fir Trees Eileen' (St)
Pelargonium Fragrans Group (Sc)
Pelargonium 'Frank Headley' (Z/v) AGM
Pelargonium 'Lord Bute' (R) AGM
Pelargonium 'Morwenna' (R)
Pelargonium 'Mrs Quilter' (Z/C) AGM
Pelargonium 'Noche' (R)
Pelargonium 'Rose Paton's Unique' (U/Sc)
Pelargonium 'Royal Ascot' (R)
Pelargonium 'Scarlet Pet' (U)
Pelargonium 'Scarlet Rambler' (Z/d)
Pelargonium sidoides
Pelargonium 'South American Bronze' (R) AGM
Pelargonium 'Stella Ballerina'
Pelargonium 'Tip Top Duet' (A) AGM
Pelargonium 'Vicky Claire' (R)
Pelargonium 'Voo Doo' (Dec)
Pelargonium 'Yhu' (R)
Pennisetum alopecuroides 'Cassian's Choice'
Pennisetum alopecuroides f. viridescens
Pennisetum alopecuroides 'Red Head'
Pennisetum glaucum 'Purple Majesty'
Pennisetum macrourum
Pennisetum orientale AGM
Pennisetum setaceum 'Rubrum' AGM
Pennisetum villosum AGM
Penstemon 'Alice Hindley' AGM
Penstemon 'Apple Blossom' AGM
Penstemon barbatus 'Jingle Bells'
Penstemon barbatus 'Peter Catt'
Penstemon 'Blackbird'
Penstemon 'Burgundy'
Penstemon 'Cherry' AGM
Penstemon crandallii subsp. taosensis
Penstemon 'Dazzler'
Penstemon digitalis 'Husker Red'
Penstemon ETNA 'Yatna'
(other names: Penstemon 'Yatna' (accepted))
Penstemon 'Flamingo'
Penstemon FUJIYAMA 'Yayama' (PBR)
(other names: Penstemon 'Yayama' (PBR) (accepted), Penstemon 'Volcano Fujiyama' (PBR) (syn), Penstemon 'Fujiyama' (PBR) (syn))
Penstemon 'George Home' AGM
Penstemon heterophyllus 'Heavenly Blue'
Penstemon 'Hewell Pink Bedder' AGM
Penstemon 'Hidcote Pink' AGM
Penstemon 'Lilac and Burgundy'
Penstemon 'Lilliput'
Penstemon 'Osprey' AGM
Penstemon 'Patio Bells Shell'
Penstemon 'Patio Coral'
Penstemon 'Pensham Dorothy Wilson'
Penstemon 'Purple Bedder'
Penstemon 'Schoenholzeri' AGM
Penstemon 'Sour Grapes' ambig.
Penstemon 'Stapleford Gem' AGM
Penstemon 'Threave Pink'
Penstemon VESUVIUS 'Yasius'
(other names: Penstemon 'Yasius' (accepted), Penstemon 'Volcano Vesuvius' (syn), Penstemon 'Vesuvius' (syn))
Penstemon 'White Bedder' AGM
Penstemon 'Whitethroat' purple-flowered
Pericallis lanata Kew form
Perovskia 'Blue Spire' AGM
Persicaria amplexicaulis 'Alba'
Persicaria amplexicaulis 'Firedance'
Persicaria amplexicaulis 'Firetail' AGM
Persicaria amplexicaulis 'Rosea'
Persicaria bistorta 'Superba' AGM
Persicaria microcephala 'Red Dragon' (PBR)
Persicaria orientalis
Persicaria virginiana var. filiformis 'Lance Corporal'
Peucedanum verticillare
Phalaris arundinacea var. picta 'Feesey' (v)
Phlomis longifolia var. bailanica
Phlomis tuberosa
Phlomis tuberosa 'Amazone'
Phlomis tuberosa 'Bronze Flamingo'
Phlox adsurgens 'Wagon Wheel'
Phlox carolina 'Miss Lingard' AGM
Phlox 'Casablanca'
Phlox divaricata 'Blue Perfume'
Phlox divaricata 'Clouds of Perfume'
Phlox divaricata subsp. laphamii 'Chattahoochee' AGM
Phlox divaricata 'White Perfume'
Phlox maculata 'Reine du Jour'
Phlox paniculata 'Blue Boy'
Phlox paniculata 'Blue Paradise'
Phlox paniculata 'Brigadier' AGM
Phlox paniculata 'David'
Phlox paniculata 'Düsterlohe'
Phlox paniculata 'Frau Alfred von Mauthner'
Phlox paniculata 'Hesperis'
Phlox paniculata 'Iris'
Phlox paniculata 'Kirchenfürst'
Phlox paniculata 'Laura'
Phlox paniculata 'Little Princess'
Phlox paniculata 'Miss Pepper'
Phlox paniculata 'Monica Lynden-Bell'
Phlox paniculata 'Mount Fuji' AGM
Phlox paniculata 'Norah Leigh' (v)
Phlox paniculata 'Peppermint Twist'
Phlox paniculata 'Rijnstroom'
Phlox paniculata 'Rosa Pastell'
Phlox paniculata 'Utopia'
Phlox paniculata 'Violetta Gloriosa'
Phlox stolonifera 'Home Fires'
Phlox x arendsii 'Luc's Lilac'
Phygelius aequalis 'Pink Trumpet'
Phygelius x rectus 'Moonraker'
Phygelius x rectus 'Salmon Leap' AGM
Phygelius x rectus SOMERFORD FUNFAIR CREAM 'Yapcre' (PBR)
(other names: Phygelius 'Somerford Cream' (PBR) (syn), Phygelius 'Somerford Fanfare Cream' (PBR) (ortho), Phygelius 'Yapcre' (PBR) (accepted), Phygelius 'Somerford Funfair Cream' (PBR) (ortho), Phygelius 'Fanfare Cream' (PBR) (syn))
Phygelius x rectus SOMERFORD FUNFAIR WINE 'Yapwin'
(other names: Phygelius 'Somerford Funfair Wine' (syn), Phygelius 'Yapwin' (accepted), Phygelius x rectus 'Funfair Wine' (syn), Phygelius 'Somerford Wine' (syn))
Phygelius x rectus 'Sunshine'
Phygelius x rectus 'Winchester Fanfare'
Physostegia virginiana 'Alba'
Physostegia virginiana 'Wassenhove'
Pimpinella major 'Rosea'
Platycodon grandiflorus (Apoyama Group) 'Fairy Snow'
Platycodon grandiflorus 'Fuji Pink'
Platycodon grandiflorus 'Fuji White'
Platycodon grandiflorus 'Hakone Blue'
Platycodon grandiflorus 'Hakone White'
Platycodon grandiflorus 'Mariesii' AGM
Plumbago auriculata AGM
Polemonium 'Blue Pearl'
Polemonium caeruleum 'Filigree Clouds'
Polemonium yezoense var. hidakanum BRESSINGHAM PURPLE 'Polbress'
(other names: Polemonium yezoense var. hidakanum 'Polbress' (accepted))
Polygala myrtifolia
Polygonatum multiflorum L.
Polygonatum x hybridum AGM
Polystichum setiferum (Divisilobum Group) 'Herrenhausen'
Primula beesiana (Pf)
Primula 'Belarina Butter Yellow' (Belarina Series) (Pr/Prim/d)
Primula 'Belarina Cobalt Blue' (Belarina Series) (Pr/Prim/d)
Primula 'Belarina Cream' (Belarina Series) (Pr/Prim/d)
Primula 'Belarina Rosette Nectarine' (Belarina Series) (Pr/Prim/d)
Primula bulleyana (Pf) AGM
Primula Candelabra hybrids (Pf)
Primula Candelabra hybrids orange-flowered (Pf)
Primula capitata subsp. mooreana (Ca)
Primula denticulata blue-flowered (De)
Primula denticulata lilac-flowered (De)
Primula denticulata 'Rubin' (De)
Primula denticulata var. alba (De)
Primula florindae hybrids (Si)
Primula japonica 'Miller's Crimson' (Pf) AGM
Primula 'Tie Dye' (Pr/Prim)
Primula veris (Pr) AGM
Primula vialii (So) AGM
Primula x bulleesiana (Pf)
Ptilostemon afer
Pulmonaria angustifolia 'Azurea'
Pulmonaria 'Blue Ensign'
Pulmonaria Cally hybrid
Pulmonaria 'Chintz'
Pulmonaria 'Diana Clare'
Pulmonaria 'Majesté'
Pulmonaria OPAL 'Ocupol'
(other names: Pulmonaria 'Ocupol' (accepted), Pulmonaria rubra 'Opal' (syn), Pulmonaria officinalis 'Opal' (syn))
Pulmonaria 'Raspberry Splash' (PBR)
Pulmonaria rubra 'David Ward' (v)
Pulmonaria saccharata 'Dora Bielefeld'
Pulmonaria 'Sissinghurst White' AGM
Pulmonaria 'Smoky Blue'
Pulmonaria 'Trevi Fountain'
Pulsatilla vulgaris AGM
Pulsatilla vulgaris 'Alba' AGM
Pulsatilla vulgaris 'Blaue Glocke'
Pulsatilla vulgaris 'Röde Klokke'
Pulsatilla vulgaris subsp. grandis 'Papageno'
Punica granatum var. nana AGM
Puschkinia scilloides var. libanotica
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