The mostly hermaphrodite flowers can be four or five-fold. Usually only two or four stamens are present. Each flower usually contains two, rarely up to five carpels . Most is ovary divided by wrong septa into four chambers, each containing an ovule.
Gesneriae family (Gesneriaceae): The family is divided into four sub-families with twelve tribe and 147 to 160 genera with 3200 to 3870 species, almost only tropical distribution.
Mint family (Lamiaceae): The family is divided into seven subfamilies and 230 genera with 5000 to more than 7000 species, with worldwide distribution.
Water hose family (Lentibulariaceae): It contains three genera with around 350 carnivorous plant species (carnivores), with worldwide distribution.
Linderniaceae : It contains 13 genera with about 195 species, with pantropical distribution, most of the species can be found in the Neotropic . They are mostly small, herbaceous plants with zygomorphic, four-fold flowers and opposite leaves.
Chamois horn family (Martyniaceae): It contains five genera with around 16 mostly herbaceous species in the Neotropic. They have sticky leaves that insects stick to.
Olive family (Oleaceae): The family is divided into five tribes and 25 genera with 600 species.
Summer root family (Orobanchaceae): It contains between 80 and about 100 genera with 1700 to 2100 parasitic , mostly herbaceous species.
Bluebell family (Paulowniaceae): It contains only one genus:
Schlegeliaceae : It contains about four genera with about 37 species in the Neotropic. They are large trees, shrubs, climbing plants or epiphytes. They have opposite leaves, zygomorphic flowers and berries.
Figwort family (Scrophulariaceae): It contains 52 to 65 genera with around 1700 species, with worldwide distribution.
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Angiosperm Phylogeny Group: An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV . In: Botanical Journal of the Linnean Society . tape181 , no.1 , 2016, p.1-20 , doi : 10.1111 / boj.12385 ( abstract ).