Clematis × jackmanii

Clematis 'Jackmanii' is a Clematis cultivar which, when it was introduced in 1862, was the first of the modern large-flowered hybrid clematises of gardens. It is a climber with large violet-purple blooms, still among the most familiar climbers seen in gardens. It was produced from crosses made by the prominent nurseryman George Jackman (1837–1887), of Jackman & Sons, Woking, Surrey.

C. 'Jackmanii' arose from crosses made in 1858 between Clematis lanuginosa, the red form of C. viticella, and an earlier garden hybrid, Clematis × hendersonii, which the new hybrid eclipsed. The spectacular success of 'Jackmanii' encouraged Jackman & Sons to introduce a series of clematis hybrids, although none of these ousted 'Jackmanii' from favour. Jackman also produced a monograph, The Clematis as a Garden Flower (with T. Moore, 1872), which he dedicated to H.S.H. Princess Mary, Duchess of Teck, as the clematis was one of her favourite flowers.