| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
| Miscanthus sinensis 'Strictus' | Chinese silver grass, Eulalia | Perennial | grass | |
| Miscanthus sinensis 'Zebrinus' | Chinese silver grass, Eulalia | Perennial | grass | |
|
Miscanthus sinensis var. condensatus 'Cabaret' | maiden grass, maidenhair grass, eulalia, Chinese silver grass, Japanese silver grass | Perennial | grass |
| Morus alba | White Mulberry | Perennial | tree | |
|
Muehlenbeckia complexa | mattress vine, maidenhair vine, creeping wire vine, lacy wire vine, angel vine, mattress wire weed, necklace vine, wire vine | Perennial | vine |
|
Muhlenbergia capillaris | Hairyawn muhly grass, Hair grass | Perennial | grass |
|
Muhlenbergia rigens | Deergrass | Perennial | grass |
|
Myoporum acuminatum | Waterbush, Pointed boobialla, Mangrove boobialla, Strichnine bush | Perennial | tree |
|
Myoporum laetum | Myoporum laetum Clean n Green, ngaio tree | Perennial | shrub |
|
Nandina domestica | Heavenly Bamboo, Sacred Bamboo | Perennial | shrub |
| Nandina domestica 'Firepower' | Firepower Nandina | Perennial | shrub | |
|
Nardus stricta | matgrass, moor matgrass, nard grass | Perennial | grass |
| Nasella trichotoma | serrated tussock grass, Yass tussock, Yass River tussock | Perennial | grass | |
| Nepeta racemosa 'Walker's Low' | catmint | Perennial | forb | |
| Nerium oleander L. | Oleander | Perennial | shrub | |
| Nothoscordum gracile | slender false garlic, onionweed | Perennial | forb | |
| Oenothera berlandieri | Mexican evening primrose, pinkladies, white evening-primrose | Perennial | forb | |
|
Oenothera glazioviana | redsepal evening primrose, largeflower evening primrose | Biennial | forb |
|
Oenothera hispida | |||
|
Oenothera sinuosa | Wavyleaf beeblossom, wavy-leaf gaura | Perennial | forb |
|
Oncosiphon piluliferum | globe chamomile, stinknet | Annual | forb |
|
Onobrychis viciifolia | esparcet, sainfoin, holy-clover | Perennial | forb |
|
Onopordum illyricum | Illyrian thistle, Illyrian cottonthistle | Biennial | forb |
|
Onopordum tauricum | Taurian thistle, bull cottonthistle | Biennial | forb |
| Orobanche aegyptiaca | Egyptian broomrape | Perennial | forb |