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A vigorous evergreen climber allied to L. periclymenum and L. etrusca, making growths up to 6 ft or more long in a single season. Leaves on the flowering shoots oval to oblong, 1 to 11⁄2 in. long, glabrous and glaucous, all sessile and the upper pairs connate; leaves on the extension growths smaller and stalked. Inflorescences glandular, sessile, with three to five whorls of flowers. Corolla 1 to 11⁄2 in. long, reddish purple and glandular on the outside, yellowish white within. Flowering season June to August. Bot. Mag., t. 9517.
Native of Spain; introduced about 1880. It differs from the common woodbine in having the upper pairs of leaves connate; from L. etrusca in having the flowers in a terminal stalkless spike, springing directly from the uppermost pair of leaves; and from both in its glaucous leaves and glandular inflorescences. This beautiful plant, which fully deserves its specific epithet, is not common in gardens but is hardy on a south-facing wall. There is a fine specimen in the National Trust garden at Sissinghurst in Kent.
Graham Thomas tells us that this species grows well on warm walls in the National Trust gardens at Wallington Hall, Northumberland and Crathes Castle, south-west of Aberdeen.