| Azolla pinnata R. Br. | Stergianou, K. K. & K. Fowler. 1989. Preliminary report of chromosome counts in the genus Azolla (Pteridophyta). Fern Gaz. 13: 317–319. | 88-89 | | 44, 66, 88 |
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| Azolla pinnata R. Br. | Nayak, S. K. & P. K. Singh. 1989. Cytological studies in the genus Azolla. Cytologia 54: 275–286. | 88-89 | 22, 26, 29, 31, 34 | 44, 66 |
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| Azolla pinnata R. Br. | Srivastava, R. B. 1985. Ferns of the Indo-Nepal border. Proc. Roy. Soc. Edinburgh, Sect. B, Biol. Sci. 86: 471–472. | 84-85 | 22 | 44 |
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| Azolla pinnata R. Br. | Stergianou, K. K. & K. Fowler. 1990. Chromosome numbers and taxonomic implications in the fern genus Azolla (Azollaceae). Pl. Syst. Evol. 173: 223–239. | 90-91 | | 44, 66, 88 |
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| Azolla pinnata R. Br. | Ammal, L. S. & K. V. Bhavanandan. 1992. Studies on the cytology of some ferns from south India. Indian Fern J. 9: 94–101. | 92-93 | 44 | |
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| Azolla pinnata R. Br. | Loyal, D. S. 1974. Chromosome size and structure in some heterosporous ferns with a bearing on evolutionary problems. Pp. 292-298 in P. Kachroo (ed.), Advancing Frontiers in Cytogenetics. Hindustan Publ. Co., Delhi. | | | 44 |
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