perennials suitable for moist to wet conditions

Cimicfuga Bugbane

Arum  (Italian Arum)
Aruncus (Goatsbeard)
Astilbe  (False Spirea)
Brunnera (Siberian Bugloss)
Caltha palustris (Marsh Marigold) (Clustered Bellflower)
Campanula glomerata
Chelone
 (Turtlehead)
Cimicifuga  (Bugbane)
Ferns
Hibiscus
Hosta
Houttuynia
 (Chamelion Plant)
Iris ensata; kaempferi (Japanese Iris)
Iris pseudacorus (Yellow Flag)
Ligularia  (Groundsel)
Lobelia cardinalis (Cardinal Flower)
Lobelia siphilitica (Great Blue Lobelia)
Lysimachia (Loosestrife)
Phalaris (Ribbon Grass)
Myosotis sylvatica (Garden Forget-me-not)
Physostegia virginiana  (Obedient Plant)
Primula  (Primrose)
Pulmonaria (Lungwort)
Rodgersia  (Roger's Flower)
Tradescantia (Spiderwort)
Trollius (Globeflower)