are Cladanthus and Oxydendrum both plant genus ?
Cladanthus Cladanthus is a genus of plants in the family sunflower family, native to the Mediterranean region.
Otacanthus Octacanthus is a genus in the Plantaginaceae family consisting of up to 5 species which occur in Brazil. They are usually soft-wooded shrubs or small trees, growing at very sunny spots. The flowers are showy and zygomorphic with big lips (labella).