As of December 2019[update], Plants of the World Online accepts 107 species:
"Ammannia L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 31 December 2019. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30002041-2 ↩
Jepson Manual Treatment http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?5029,5030 ↩
"Ammannia". Integrated Taxonomic Information System. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=27090 ↩
USDA Plants Profile https://plants.usda.gov/java/profile?symbol=AMMAN ↩