Flora

Abel Tasman's dense rainforest is dominated by black beech (Nothofagus solandri) communities but are shared with many other native tree species. These include hard beech (Fuscospora truncata), kahikatea (Darcycarpus dacrydiodes), kamahi (Weinmannia racemosa), rimu (Dacrydium cupressinum), northern rata (Metrosideros robusta), silver beech (Nothofagus menziesii), pohutukawa (Metrosideros excelsa) and titoki (Alectryon excelsus).

The layer of vegetation beneath the main canopy is made up of smaller trees and shrubs. Among New Zealand's understory live about 200 different fern species, such as the black fern
(Cyathea medullaris), silver fern (Cyathea dealbata), gully tree fern (Cyathea cunninghammii) and the rough tree fern (Dicksonia squarrosa) in Abel Tasman. Other small trees are kowhai (genus Sophora), akeake (Dodonaea viscosa), tutu (Coriaria arboreal), manuka (Leptospermum scoparium), kanuka (Kunzea ericoides) and whiteywood (Melicytus ramiflorus).

Shrubs like kawakawa
(Macropier excelsum) and Pittosporum lineare exist throughout the park. Wetter areas are occupied by raupo (Typha orientalis), ribbonwood (Plagianthus divaricatus) and sedges (Juncus maritimes australiensis). Coastal regions are known for sand tussock (Poa billiardierei), flax (Phormium tenax), sea bindweed (Calystegia soldanella) and sand sedge (Carex pumila).

Flowering plants such as clematis
(Clematis paniculata) are abundant. Many orchid species can be found as well. The milktree (Streblus banksii) is commonly found on the park's islands.

Native species that are considered to be nationally vulnerable or critical are coastal pepper cress
(Lepidium banksii), shovel mint (Scutellaria novae-zelandiae), limestone groundsel (Senecio aff. glaucophyllus), sword leaf puha (Kirkianella glauca), and rorippa (Rorippa divaricata). Many more such as the mistletoe (Peraxilla colenso, Peraxilla tetrapetala) are at risk.

Introduced species include gorse (
Ulex europaeus), German ivy (Senecio mikanioides), broom (Cytisus scoparius), wandering willy (Tradescantia fluminensis), montbretia (Crocosmia), privet (Ligustrum), Cotoneaster, hakea (Hakea salicifolia) and marram grass (Ammophila arenaria). These plant species and introduced predators (such as possums) are threatening Abel Tasman's natural vegetation.
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