- Naked-flowered tick-trefoil
- Nannyberry
- Narrow-leaved bittercress
- Narrow-leaved cattail
- Narrow-leaved clover
- Narrow-leaved Everlasting-pea
- Narrow-leaved hawksbeard
- Narrow-leaved Helleborine
- Narrow-leaved Ragwort
- Narrowleaf cow wheat
- Narrowleaf milkweed
- Narrowleaf mountainmint
- Narrowleaf puccoon
- Natal grass
- Neat Feather-moss
- Neem
- Netted chain fern
- Nettle-leaved Bellflower
- Nettle-leaved goosefoot
- New England aster
- New Jersey tea
- New York fern
- New Zealand cabbage tree
- New Zealand flax
- New Zealand Spinach
- Ngaio
- Nipplewort
- Nodding Beggarticks
- Nodding Greenhood
- Nodding onion
- Nodding trillium
- Noni
- Northern bayberry
- Northern Bedstraw
- Northern blue flag
- Northern bush honeysuckle
- Northern catalpa
- Northern ground-cedar
- Northern holly fern
- Northern lady fern
- Northern maidenhair fern
- Northern oak fern
- Northern prickly ash
- Northern red oak
- Northern seaside goldenrod
- Northern spicebush
- Northern starflower
- Northern whitecedar
- Northern wild raisin
- Northern Wolfsbane
- Norway maple
- Norway spruce
- Notch-leaf Scorpionweed
- Nottingham Catchfly