Children (6 direct children, 8 direct and indirect children):
Petalonyx linearis
Narrowleaf sandpaper plant
Petalonyx nitidus
Shinyleaf sandpaper plant
Petalonyx thurberi
(tree size 2)
Thurber's sandpaper plant
Petalonyx crenatus
Petalonyx parryi
Parry's sandpaper plant
Petalonyx gilmanii