Polemonium caeruleum 'Alba'

Also known as 'Jacob's Ladder'. A cultivar of Polemonium caeruleum, the blue 'Jacob's Ladder'. Clump-forming perennial, mainly hairless but softly hairy near the inflorescences. Bears open, bell-shaped,white flowers, up to 2.5cm across, with prominent yellow stamens on erect, branched stems in early summer.