The Illustrated Dictionary of Gardening

Every genus a Victorian gardener could grow — Abelia to Zygopetalum across four volumes, with each plant's history, species, and culture, by the Curator of Kew.

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Summer (L flat cleft into three)

l. flat, cleft into three to seven parts beyond the middle, with wedge-shaped lobes, which are trifid or jagged, and acuminated at the apex; petioles not dilated at the base. h. 3ft. to 6ft. North America. 1758. SYN. D. elatum.(B.M.1791) D. formosum (beautiful).* fl. sky-blue, shaded with indigo; spur rather long, two-cleft, of a violet hue; sepals longer than the petals; spikes long.

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