Noun | 1. | ![]() rosid dicot genus - a genus of dicotyledonous plants Caesalpinioideae, subfamily Caesalpinioideae - alternative name in some classification systems for the family Caesalpiniaceae Parkinsonia aculeata, horsebean, Jerusalem thorn - large shrub or shrubby tree having sharp spines and pinnate leaves with small deciduous leaflets and sweet-scented racemose yellow-orange flowers; grown as ornamentals or hedging or emergency food for livestock; tropical America but naturalized in southern United States Cercidium floridum, palo verde, Parkinsonia florida - densely branched spiny tree of southwestern United States having showy yellow flowers and blue-green bark; sometimes placed in genus Cercidium |