Cistus × ingwersenii Demoly

A low procumbent shrub 1 to 11⁄2 ft high; stems and inflorescence axes clad with long erect hairs intermixed with much shorter ones. Leaves linear-lanceolate, 3⁄4 to 13⁄8 in. long, 1⁄8 to 3⁄16in. wide, with revolute margins, three-veined, sessile, upper surface dark green with scattered stellate hairs and shorter simple hairs, densely stellate-tomentose beneath. Flowering branches slender, produced from the axils of the leaves or of leaf-like bracts, bearing a terminal umbel-like cyme subtended by a pair of boat-shaped acuminate bracts; lower bract-pairs sterile or subtending solitary flowers. Sepals four (on specimen examined, but probably varying from three to five), furnished with long spreading hairs, the outer pair ovate. Flowers 1 in. or slightly more across, with white petals. Style very short.

A natural hybrid discovered by W. E. Th. Ingwersen in Portugal around 1929 and introduced by him. The name given to it by E. F. Warburg appears in the Kew Hand-list of 1934 but [at the time of publication had] never been validated by a Latin description, C. × ingwersenii is a pretty shrub of low, mounded habit, bearing its white flowers over a long period (May-July). It is hardy.