Jacob's-ladder
Polemonium caeruleum
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.
- Scientific name
- Polemonium caeruleum
- Family
- Polemoniaceae