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| Pearly everlasting, Anaphalis spp. |
| Peony, Paeonia hybrids |
| Pincushion flower, Scabiosa caucasica |
| Pinks, Dianthus spp. |
| Poppy, opium, Papaver somniferum |
| Poppy, Papaver spp. |
| Primrose, cowslip , Primula veris |
| Primrose, Primula x polyantha |
| Primrose, showy evening, Oenothera speciosa |
| Pyrethrum, Pyrethrum roseum = C. coccineum |
| Red hot poker, Kniphofia uvaria |
| Red valerian, Centranthus ruber |
| Rodgersia, Rodgersia spp. |
| Rose campion, Lychnis coronaria |
| Rose mallow, Hibiscus moscheutos |
| Sage, hybrid, Salvia x superba |
| Sage, Russian, Perovskia atriplicifolia |
| Sage, sky-blue, Salvia uliginosa |
| Sage,velvet, Salvia leucantha |
| Sea holly, Eryngium spp. |
| Sea lavender, Limonium latifolium |
| Sea thrift, Armeria maritima |
| Self-heal, Prunella x webbiana |
| Sneezeweed, Helenium autumnale |
| Soapwort, Saponaria officinalis |
| Solomon's seal, Polygonatum biflorum |
| Spiderwort, Tradescantia x andersonii |
| Spurge, Euphorbia spp. |
| Statice, Limonium spp. |
| Stonecrop, Sedum spp. |
| Strawberry geranium, Saxifraga stolonifera |
| Sundrops, Oenothera fruticosa |
| Sunflower, Helianthus spp. |
| Turk's turban, Malvaviscus arboreus |
| Tweedia, Oxypetalum caeruleum = Tweedia caerulea |
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Images: ©Alice B. Russell and Erv Evans
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