Extrafloral nectaries have been reported in over 3941 species of vascular plants belonging to 745 genera and 108 families, 99.7% of which belong to flowering plants (angiosperms), comprising 1.0 to 1.8% of all known species. They are most common among eudicots, occurring in 3642 species (of 654 genera and 89 families), particularly among rosids which comprise more than half of the known occurrences. The families showing the most recorded occurrences of extrafloral nectaries are Fabaceae, with 1069 species, Passifloraceae, with 438 species, and Malvaceae, with 301 species. The genera with the most recorded occurrences are "Passiflora" (322 species, Passifloraceae), "Inga" (294 species, Fabaceae), and "Acacia" (204 species, Fabaceae). Other genera with extrafloral nectaries include "Salix" (Salicaceae), "Prunus" (Rosaceae) and "Gossypium" (Malvaceae).