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| Kaffir lily, Schizostylis coccinea |
| Knotweed, Polygonum spp. |
| Lady's mantle, Alchemilla mollis |
| Lamb's-ears, Stachys byzantina |
| Lantana, Lantana camera |
| Larkspur, Delphinium spp. |
| Lavender, Lavandula angustifolia |
| Leadwort, Ceratostigma plumbaginoides |
| Lenten rose, Helleborus orientalis |
| Leopard plant, Ligularia tussilaginea |
| Leopard's bane, Doronicum spp. |
| Ligularia, Ligularia stenocephala |
| Lily, peruvian, Alstroemeria hybrids |
| Loosestrife, gooseneck , Lysimachia clethroides |
| Loosestrife, purple, Lythrum salicaria |
| Lungwort, Pulmonaria saccharata |
| Lupine, Lupinus spp. |
| Lupine, southern, Thermopsis caroliniana |
| Maltese cross, Lychnis chalcedonica |
| Marsh marigold, Caltha palustris |
| Meadow-rue, Thalictrum aquilegifolium |
| Meadowsweet, Filipendula palmata |
| Mealy-cup sage, Salvia farinacea |
| Monkshood, Aconitum spp. |
| Moss phlox, Phlox subulata |
| Mountain bluet, Centaurea montana |
| Mullein, Verbascum spp. |
| Obedient plant, Physostegia virginiana |
| Oxalis, Oxalis crassipes |
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Images: ©Alice B. Russell and Erv Evans
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