- Greek valerian, Polemonium reptans - erect or spreading perennial of the eastern United States
--1 is a kind of polemonium
- Jacob's ladder, Greek valerian, charity, Polemonium caeruleum, Polemonium van-bruntiae, Polymonium caeruleum van-bruntiae - pinnate-leaved European perennial having bright blue or white flowers
--2 is a kind of polemonium