Children (24 direct children, 24 direct and indirect children):
Petalium evolutum
Petalium globulum
Petalium seriatum
Petalium incarinatum
Petalium arizonense
Petalium debilitatum
Petalium alternatum
Petalium whitei
Petalium parmatum
Petalium uniperforatum
Petalium californicum
Petalium knulli
Petalium schwarzi
Petalium brevisetum
Petalium incisum
Petalium alaseriatum
Petalium demicarinatum
Petalium longulum
Petalium debile
Petalium grossum
Petalium bicolor
Petalium yuccae
Petalium bistriatum
Petalium werneri