Azolla mexicana Schlecht. & Cham., 1830 species doubtful

Azolla mexicana Schlecht. & Cham. ex K.Presl species synonym

Azolla caroliniana Willd. species accepted

Azolla pinnata R.Br. species accepted

Azolla filiculoides Lam. species accepted

Azolla mexicana C.Presl species accepted

Azolla keuja Hermsen et al., 2019 species accepted

Azolla primaeva Arnold, 1955 species accepted

Azolla stanleyi Jain & Hall, 1969 species accepted

Azollophyllum primaevum Penhallow, 1890 species doubtful

Azolla nana Dorofeev, 1980 species accepted

Azolla coloniensis De Benedetti & Zamaloa, 2018 species accepted

Azolla ventricosa Dorofeev, 1955 species accepted

Azolla vellus Jain & Hall, 1969 species accepted

Azolla schopfii Dijkstra, 1961 species accepted

Salvinia azolla Raddi species synonym

Azolla filiculoides var. filiculoides variety synonym

Azolla intertrappea Sahni & Rao, 1934 species accepted

Azolla circinata Oltz & Hall species doubtful

Azolla japonica Franch. & Sav. species synonym

Azolla magellanica Willd. species synonym

Azolla nilotica Decne. ex Mett. species doubtful

Azolla portoricensis Spreng. species synonym

Azolla cristata Kaulf. species accepted

Azolla squamosa Molina species synonym

Azolla microphylla Kaulf. species synonym

Azolla bonariensis Bertol. species synonym

Azolla rubra R.Br. species accepted

Azolla densa Desv. species synonym

Azolla filiculoides var. rubra (R.Br.) Strasb. variety synonym

Azolla arbuscula Desv. species synonym

Azolla filiculoides subsp. cristata (Kaulf.) Fraser-Jenk. subspecies synonym

Azolla mexicana Schltdl. & Cham. ex Kunze species synonym

Azolla japonica (Franch. & Sav.) Franch. & Sav. ex Nakai species synonym

Azolla pinnata var. japonica Franch. & Sav. variety synonym

Carpanthus axillaris Raf. species synonym

Azolla nilotica Decne. species accepted

Azolla prisca Reid & Chandler, 1926 species accepted