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JACOB’S-LADDER Polemonium caeruleum (Polemoniaceae) Height to 1m. Attractive, upright perennial of grassy places and scree slopes in limestone areas. FLOWERS are 2-3cm across and bright blue with 5 petal-like corolla lobes; in spikes (Jun-Jul). FRUITS are capsules. LEAVES are alternate and pinnate with 6-12 pairs of leaflets. STATUS-Locally native in N England; naturalised elsewhere.