1 Leaf bases heart-shaped, lobes often overlapping, flowers >2 in. wide,
upright……….Chiranthodendron pentadactylon
1′ Leaf bases tapering, rounded, or truncated at leaf stalk, basal lobes if
present not overlapping; flowers <1.5 in. wide, facing downward
  2 Fruit a membranous capsule, green,
  splitting open before completely
  developed……….Firmania simplex
  2′ Fruit a woody follicle, brown, not splitting
  until developed……….Brachychiton spp.