Eurystyles borealis A.H. Heller Eurystyles borealis A.H. Heller in Fieldiana, Bot. 31(12): 279-281, f. 1. 1968 sec. Soto-Arenas & al. 2007=Synanthes borealis (A.H. Heller) Burns-Bal., H. Rob. & Merc. S. Foster in Brittonia 37(2): 160. 1985 syn. sec. Soto-Arenas & al. 2007