Photo: Carl Axel Magnus Lindman · Public domain ↗
| Scientific name | Polemonium caeruleum |
|---|---|
| Genus | Polemonium |
| Origin | Europe, temperate Asia |
| Family | Polemoniaceae |
| Region | Europe |
Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, is a hardy perennial flowering plant. The plant produces cup-shaped, blue or white flowers. It is native to temperate regions of Europe. It is the type species of the phlox family, Polemoniaceae.