Pteridophyte Phylogeny Group I (November 2016), "A community-derived classification for extant lycophytes and ferns", Journal of Systematics and Evolution, 54 (6): 563–603, doi:10.1111/jse.12229, S2CID39980610
Rutishauser, R. (1999). "Polymerous leaf whorls in vascular plants: Developmental morphology and fuzziness of organ identities". International Journal of Plant Sciences. 160 (6): 81–103. doi:10.1086/314221. JSTOR10.1086/314221. PMID10572024. S2CID4658142.
Rutishauser, R. (1999). "Polymerous leaf whorls in vascular plants: Developmental morphology and fuzziness of organ identities". International Journal of Plant Sciences. 160 (6): 81–103. doi:10.1086/314221. JSTOR10.1086/314221. PMID10572024. S2CID4658142.
Rutishauser, R. (1999). "Polymerous leaf whorls in vascular plants: Developmental morphology and fuzziness of organ identities". International Journal of Plant Sciences. 160 (6): 81–103. doi:10.1086/314221. JSTOR10.1086/314221. PMID10572024. S2CID4658142.
Pteridophyte Phylogeny Group I (November 2016), "A community-derived classification for extant lycophytes and ferns", Journal of Systematics and Evolution, 54 (6): 563–603, doi:10.1111/jse.12229, S2CID39980610
Rutishauser, R. (1999). "Polymerous leaf whorls in vascular plants: Developmental morphology and fuzziness of organ identities". International Journal of Plant Sciences. 160 (6): 81–103. doi:10.1086/314221. JSTOR10.1086/314221. PMID10572024. S2CID4658142.