Synonyms for Horse Cassia (same or very similar meaning)
WordNet sense 1 (East Indian tree having long pods containing a black cathartic pulp used as a horse medicine):
Cassia marginata, Cassia roxburghiiWordNet sense 2 (tropical American semi-evergreen tree having erect racemes of pink or rose-colored flowers; used as an ornamental):
pink shower, Cassia grandis, pink shower treeFrom the ODE community, based on WordNetadd/edit