Onagraceae

Circaea

alpina (Smaller Enchanter's Nightshade)

lutetiana (Enchanter's Nightshade)

quadrisulcata (see lutetiana)

Epilobium

angustifolium (Fireweed)

ciliatum (Northern Willow Herb)

coloratum (Purple-leaved Willow Herb)

glandulosum (see ciliatum)

hirsutum (Hairy Willow Herb)

leptophyllum (Narrow-leaved Willow Herb)

strictum (Downy Willow Herb)

Gaura

biennis (Biennial Gaura)

Jussiaea (see Ludwigia)

Ludwigia

alternifolia (Seedbox)

decurrens (Upright Primrose Willow)

palustris (Water Purslane)

peploides (Creeping Primose Willow)

polycarpa (Many-fruited False Loosestrife)

repens (see peploides)

Oenothera

biennis (Common Evening Primrose)

cruciata (see parviflora)

fruticosa (Sundrops)

humifusa (Seabeach Evening Primrose)

laciniata (Cut-leaved Evening Primrose)

macrocarpa (Large-flowered Evening Primrose)

missouriensis (see macrocarpa)

parviflora (Small-flowered Evening Primrose)