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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, probably between Halimium umbellatum and Cistus psilosepalus (hirsutus), 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 has never been validated by a Latin description, × H. ‘Ingwersenii’ is a pretty shrub of low, mounded habit, bearing its white flowers over a long period (May-July). It is hardy.