Lysichiton americanus

Lysichiton camtchatcensis

Calla palustris

spathe yellow, up to 35 cm, flowers 3-4 mm, with fetid odour spathe white, up to 20 cm, flowers 2-3 mm, odourless spathe white inside, pale green outside, 3-7 cm
large leaves with truncate-cuneate base, up to 135 cm large leaves with truncate-cuneate base, up to 100 cm leaves with heart-shaped base, up to 12 cm long