Kingdom: Plantas
Division: Spermatophyta
Subdivision: Magnoliophytina
Class: Magnoliopsida
Order: Saxifragales
Family: Crassulaceae
Genus: Umbilicus
Common name: Narrow Navelwort
Species name: Umbilicus horizontalis (Guss.) DC.
Azorean endemic: No
Coordinator: Rui Bento Elias & Prof. Luis Silva