Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Cistus symphytifolius' from the website Trees and Shrubs Online (treesandshrubsonline.
A shrub of rather open, straggling habit, 2 to 6 ft high according to situation; young stems sparsely clad with long hairs. Leaves oblong to oblong-elliptic, 13⁄5 to 4 in. long, 3⁄5 to 23⁄5 in. wide, pointed at the apex, tapered at the base into a short stalk; dark green above, with scattered hairs, somewhat tomentose beneath; margins plane or undulate. Flowers purplish pink, to 2 in. or a little more across, two to nine together in hairy panicles; sepals five, hairy, especially near the base; style to 1 in. long and always much longer than the stamens.
Native of the Canary Islands, mostly confined to the mountains above 1,500 ft; introduced early in the nineteenth century but, owing to its tenderness, uncommon in gardens.
[Bean recognised var. leucophyllus, with stems and leaves densely white-hairy, but this has been referred to the type. As synonym for this taxon he also gave Cistus ocreatus C.Sm, but this is now accepted as a separate species.]