Pseuderanthemum praecox (Benth.) Leonard Pseuderanthemum praecox (Benth.) Leonard in J. Wash. Acad. Sci. 31: 99. 1941 sec. Daniel 2004=Siphoneranthemum praecox (Benth.) Kuntze, Revis. Gen. Pl. 2: 497. 1891 syn. sec. The Plant List 2013