Monogeneric families H (external links)

Additional families in M and MSB classified according to Stevens 2001 onwards (APWeb).

• Himantandraceae
• Hydatellaceae (following POWO and Sokoloff et al. 2008)
• Hydroleaceae
• Hydrostachyaceae

References

• Sokoloff, D.D., Remizowa, M.V., Macfarlane, T.D. and Rudall, P.J. (2008). Classification of the early-divergent angiosperm family Hydatellaceae: one genus instead of two, four new species and sexual dimorphism in dioecious taxa. Taxon, 57, 179-200. https://doi.org/10.2307/25065959
• Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 14, July 2017 [and more or less continuously updated since].

Foto: Hydrolea L. (Hydroleaceae) © Vojtěch Zavadil (Know your weeds)