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........5 Gynostemium lobes 3; calyx limb 3-lobed, the lobes similar in size and shape and arranged radially around the tube orifice at 120 degree angles
............ 7 Calyx limb 2-lobed, the lower lanceolate, acuminate, folded longitudinally and bird-beak-like, 10-20 cm long, the upper with a parallel-sided claw and orbicular tip.
............ ....9 Upper lobe of calyx limb 14-18 cm wide, with ruffled margin, pendent below the lower lip
......4 Gymnostemium lobes 3; calyx limb 3-lobed, the lobes similar in size and shape and arranged radially around the tube orifice at 120 degree angles; [subtribe Isotrematinae]