Styrax platanifolius subsp. youngiae (Cory) P.W. Fritsch Styrax platanifolius subsp. youngiae (Cory) P.W. Fritsch in Ann. Missouri Bot. Gard. 84(4): 744. 1998 ["1997"] sec. Villaseñor & al. 2010≡Styrax youngiae Cory in Madroño 7(4): 113-115. 1943 syn. sec. Fritsch 1997