Casselia, Nees & Martius, 1823

Cardoso, Pedro Henrique, Valério, Vanessa Imaculada Dos Reis, Neto, Luiz Menini & Salimena, Fátima Regina Gonçalves, 2021, Verbenaceae in Espírito Santo, Brazil: richness, patterns of geographic distribution and conservation, Phytotaxa 484 (1), pp. 1-43 : 8

8. Racemes reduced to two flowers; calyx campanulate........................................................................................................3. Casselia

8’. Racemes multiflowered (more than two flowers); calyx tubular