rockrose

IPA: rˈɑkroʊz

Any of various plants in the family Cistaceae.
(especially) Any species of the genus Helianthemum, low shrubs or herbs with yellow flowers, especially the European Helianthemum nummularium (syn. Helianthum vulgare) and the American frostweed, Helianthum canadense.
Pavonia lasiopetala (Malvaceae), Texas swampmallow.
Phemeranthus spp. (Montiaceae), flameflowers.
Portulaca grandiflora (Portulacaceae) moss-rose purslane.

rock rose

IPA: rˈɑkrˈoʊz