Nicholson, B. E.; Brightman, F. H.: The Oxford Book of Flowerless Plants. Ferns, Fungi, Mosses and Livervorts. Lichens, and Seaweeds. Oxford University Press, 1979
Niehaus, T. F.; Ripper, C. L.: A Field Guide to Pacific States Wildflowers. Houghton Mifflin, 1976The Peterson Field Guide series: 22.
Niehaus, T. F.; Ripper, C. L.; Savage, V.: A Field Guide to Southwestern and Texas Wildflowers. Houghton Mifflin, 1984The Peterson Field Guide series: 31.
Niering, W. A.; Olmstead, N. C.: The Audubon Society Field Guide to North American Wild Flowers. Eastern Region. Knopf, 1979
Nilsson, S.; Spieksma, F. Th. M.: Allergy Service Guide in Europe. Palynological laboratory, Swesish Museum of Natural History, 1994
Nilsson, S.; Praglowski, J.; Nilsson, L.: Atlas of Airborne Pollen Grains and Spores in Northern Europe. Natur och Kultur, 1977
Nilsson, S.; Spieksma, F. Th. M.: Traveller's Allergy Service Guide. Palynological Laboratory, Swedish Museum of Natural History; Fisons Sweden AB, 1992
Norris, L. L.: A Checklist of the Vascular Plants of Death Valley National Monument. Death Valley Natural History Association, 1982
Nyéki, J.; Soltész, M.; Szabó, Z. (eds.): Morphology, Biology and Fertility of Flowers in Temperate Zone Fruits. Akadémiai Kiadó, 2008
Oberdorfer, E.: Pflanzensoziologische Exkursionsflora für Südwestdeutschland und die angrenzenden Gebiete. Ulmer, 1949
Oberdorfer, E.: Pflanzensoziologische Studien in Chile. Ein Vergleich mit Europa. J. Cramer, 1960Flora et vegetatio mundi: 2.
Papp, C.: Briofitele din Republica Socialista Romania. (Determinator). 1967Sectiunea II. (Stiinte naturale) a. Biologie, Mnografii 3.
Pedersen, H. A.; Kühn, R.; Cribb, P.: Field Guide to the Orchids of Europe and the Mediterranean. Kew Publishing, 2019
