Bailey, Irving Widmer (1884-1967) R.H. Wetmore, Phytomorphology 18 (1968) 294-298, phot. Dennstedt, A.W. H. Manitz, August Wilhelm Dennstedt’s Schlüssel zum Hortus Indicus Malabaricus. Taxon 17 (1968) 496-501, 2 tab.). — Rather extensive survey; validly published names are listed, as well as the nomina.