x Halimiocistus is a genus of bi-generic hybrids (i.e. each has parents from two different genera; in this case one Cistus parent and one Halimium parent).
The “x” preceding the name indicates this hybridity.
There are 4 hybrids within x Halimiocistus
x H. wintonensis ‘Merrist Wood Cream’ is a sport with cream petals.
(A plant of x H. revolii was found with pale yellow petals. This colour form is not in cultivation.)
Click on a link for a description and photograph
x Halimiocistus revolii (Coste) Dans.
x Halimiocistus sahucii (Coste & Soulié) Janch.
x Halimiocistus sahucii ‘Ice Dancer’ (variegated)
x Halimiocistus wintonensis hort. ex O.E. Warb. & E.F. Warb.