• (1) Nabaluia angustifolia - Nananthus loganii
• (2) Nananthus luckhoffii - Narcissus 'Ballyvoy'
• (3) Narcissus 'Baltic Shore' - Narcissus 'Corbiere'
• (4) Narcissus 'Corbridge' - Narcissus 'Frigid'
• (5) Narcissus 'Frogmore' - Narcissus 'Joy'
• (6) Narcissus 'Joybell' - Narcissus 'Mount Rainier'
• (7) Narcissus 'Mount Royal' - Narcissus 'Red Reed'
• (8) Narcissus 'Red Rum' - Narcissus 'Supreme Empire'
• (9) Narcissus 'Surfside' - Narcissus benacensis
• (10) Narcissus bergidensis - Narcissus pseudonarcissus 'Praecox'
• (11) Narcissus pseudonarcissus 'Princeps' - Narvalina homogama
• (12) Nasa aequatoriana - Nasturtium sativum
• (13) Nasturtium saxatile - Navia albiflora
• (14) Navia aliciae - Navicula distans
• (15) Navicula distinctastriata - Navicula miranda
• (16) Navicula misella - Navicula subirroratoides
• (17) Navicula sublanceolata - Neckera morrisenensis
• (18) Neckera muratae - Neea buchtienii
• (19) Neea buxifolia - Nemacladus glanduliferus var. orientalis
• (20) Nemacladus gracilis - Nemopanthes ilicifolia
• (21) Nemopanthes lucida - Neochloris aquatica
• (22) Neochloris gelatinosa - Neolloydia mandragora
• (23) Neolloydia matehualensis - Neopilea anivoranensis
• (24) Neopilea tsaratananensis - Neotinea corsica
• (25) Neotinea intacta - Nepenthes rosulata
• (26) Nepenthes rowanae - Nepeta virgata
• (27) Nepeta virginica - Nephrodium pedatum
• (28) Nephrodium pennigerum - Nerine 'Atalanta'
• (29) Nerine 'Audrey Clarke' - Nerine 'Virgo'
• (30) Nerine 'Vivid' - Nervilia trichophylla
• (31) Nervilia umbrosa - Neuromanes vittaria
• (32) Neuronia americana - Nicotiana occidentalis obliqua
• (33) Nicotiana occidentalis subsp. hesperis - Nierembergia pubescens
• (34) Nierembergia pulchella - Nitella capitata
• (35) Nitella cernua - Nitzschia cuspidata
• (36) Nitzschia cylindriformis - Noaea minuta
• (37) Noaea mucronata - Norantea paraensis var. latifolia
• (38) Norantea pardoana - Notholaena gilliesii
• (39) Notholaena glabra - Notocactus ibicuiensis
• (40) Notocactus incomptus - Nototriche discolor
• (41) Nototriche dissecta - Nuphar spathulifera
• (42) Nuphar spathuliferum - Nymphaea 'Foxfire'
• (43) Nymphaea 'France' - Nymphaea 'Roswitha'
• (44) Nymphaea 'Rosy Morn' - Nymphaea rudgeana var. amazonum
• (45) Nymphaea rufescens - Nzidora leguveliana