Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Cistus clusii' from the website Trees and Shrubs Online (treesandshrubsonline.
Bean renders the synonym: Cistus rosmarinifolius Pourr., in part, not all
A dwarf shrub to about 1 ft high. Young shoots slender, hairy. Leaves linear, about 1 in. long, 1⁄8 to 1⁄4 in. wide, with recurved margains, hairy on both sides. Flowers white with a yellow centre, about 1 in. across, borne in sparsely hairy clusters; sepals three to five, with ciliate margins.
Native of N. Africa; introduced before 1826. It is very distinct in its small flowers and narrow leaves, and is one of the hardiest species.