Trees in the Arboretum include: Acacia dealbata, Acer campestre, Acer negundo, Acer paxii, Acer saccharinum, Aesculus x carnea, Agathis robusta, Alnus rhombifolia, Angophora costata, Araucaria bidwillii, Archontophoenix cunninghamiana, Baphia chrysophylla, Bauhinia forficata, Bauhinia variegata, Betula nigra, Brachychiton acerifolius, Brachychiton acerifolius ( Herman hybrid ), Brachychiton discolor, Brachychiton populneus, Brahea armata, Brahea brandegeei, Brahea edulis, Butia capitata, Calocedrus decurrens, Calodendrum capense, Caryota urens, Castanospermum australe, Casuarina cunninghamiana, Cedrus deodara, Cedrus libani, Celtis australis, Chamaerops humilis, Chionanthus retusus, Chorisia insignis, Chorisia speciosa, Cryptocarya rubra, Cryptomeria japonica, Cupaniopsis anacardioides, Cupressus glabra, Cupressus sp., Dalbergia sissoo, Dracaena draco, Ehretia anacua, Ehretia tinifolia, Eriobotrya deflexa, Eriobotrya japonica, Erythrina coralloides, Erythrina falcata, Erythrina humeana, Eucalyptus camaldulensis, Eucalyptus citriodora, Eucalyptus cladocalyx, Eucalyptus globulus, Eucalyptus robusta, Eucalyptus rudis, Eucalyptus viminalis, Ficus microcarpa nitida, Ficus racemosa, Ficus religiosa, Ficus sp., Fraxinus uhdei, Fraxinus velutina, Heteromeles arbutifolia, Jacaranda acutifolia, Jubaea chilensis, Juglans nigra, Lagerstroemia indica, Liquidambar formosana, Liriodendron tulipifera, Livistona australis, Livistona chinensis, Macadamia ternifolia, Magnolia grandiflora, Metasequoia glyptostroboides, Metrosideros excelsa, Myrcia cauliflora, Nyssa sylvatica, Phoenix canariensis, Phoenix dactylifera, Phoenix reclinata, Phoenix reclinata ( hybrid ), Phoenix roebelenii x rupicola, Phoenix rupicola, Phytolacca dioica, Pinus canariensis, Pinus edulis, Pinus halepensis, Pinus thunbergii, Pittosporum phillyraeoides, Pittosporum tenuifolium, Pittosporum undulatum, Podocarpus gracilior, Podocarpus totara, Psidium guajava, Quercus agrifolia, Quercus alba, Quercus cerris, Quercus coccinea, Quercus macrocarpa, Quercus palustris, Quercus rubra, Quercus suber, Quercus virginiana, Rhapidophyllum hystrix, Rhapis excelsa, Rhodosphaera rhodanthema, Rhopalostylis baueri, Rhus integrifolia, Sabal causiarum, Sabal sp., Salix babylonica, Schinus molle, Schinus polygamus, Sequoiadendron giganteum, Syagrus romanzoffiana, Tabebuia avellanedae, Taxodium distichum, Tipuana tipu, Toona ciliata, Trachycarpus fortunei, Trachycarpus wagnerianus, Tristania laurina, Trithrinax acanthocoma, Ulmus americana, Umbellularia californica, Washingtonia filifera, Washingtonia robusta, and Zelkova serrata.

The reserve is dominated by Eucalyptus cypellocarpa ( Mountain Grey Gum ) on the slopes.

The vegetation is characterised as an open woodland composed of canopy species: Forest Grey Gum ( Eucalyptus tereticornis ), Grey Box ( Eucalyptus moluccana ), Spotted Gum ( Corymbia maculata ) and Narrow-leafed ironbark ( Eucalyptus crebra ) The understory is primarily composed of Blackthorn ( Bursaria spinosa ), Acacia implexa, indigofera australis, Hardenbergia violacea and Dodonaea viscosa ssp cuneata.

For example, after an Australian bushfire, the Mountain Grey Gum tree ( Eucalyptus cypellocarpa ) starts producing a mass of shoots of leaves from the base of the tree all the way up the trunk towards the top, making it look like a black stick completely covered with young, green leaves.

Eucalyptus punctata, commonly known as Grey Gum, is a large tree of the myrtle family, Myrtaceae, native to South East Queensland and eastern New South Wales, where it specialises in poor soils such as Sydney sandstone.

The road down to the river shows the diversity of flora as you drop in elevation and visitors can experience groves of Native Hibiscus ( Hibiscus heterophyllus ) and get to see river bank terraces shaded with large, Fuzzy Box ( Eucalyptus conica ).

** Red-flowered Mallee Box, Eucalyptus lansdowneana

* Eucalyptus melliodora, the Yellow Box species of Eucalypt

Plant communities along the river corridors near Hay typically consist of forests dominated by River Red Gum ( Eucalyptus camaldulensis ), with Black Box trees ( E. largiflorens ) on the outer margins and in low-lying areas further from the river.

* Box, a type of the Eucalyptus genus of flowering trees

Most occur in heathlands or low woodlands ; of the eastern species, B. integrifolia and B. marginata occur in forests ; many south-western species such as B. grandis, B. sphaerocarpa, B. sessilis, B. nobilis and B. dallanneyi grow as understorey plants in Jarrah ( Eucalyptus marginata ), Wandoo ( E. wandoo ) and Karri ( E. diversicolor ) forests, with B. seminuda being one of the forest trees in suitable habitat.

For example, in southwestern Australia Banksia often occurs as an understorey to forests of Jarrah ( Eucalyptus marginata ), another species highly vulnerable to dieback.

Messmate ( Eucalyptus obliqua ) and less commonly Mountain Ribbon Gum ( Eucalyptus nobilis ) dominate old-growth forests in this area which drops from 1, 450 metres down to 470 m. Other trees in the region include silvertop stringybark ( Eucalyptus laevopinea ), blue gum ( Eucalyptus saligna ), diehard stringybark ( Eucalyptus cameronii ) and New England blackbutt ( Eucalyptus andrewsii ).

This includes snow gums ( Eucalyptus pauciflora ), Antarctic Beech, tree ferns and red cedars ( Toona ciliata ).

The main species are: Angophora floribunda ( rough-barked apple ), Eucalyptus retinens ( Hillgrove box ), Eucalyptus andrewsii ( New England blackbutt ), Eucalyptus caliginosa ( broadleaved New England stringybark ), Eucalyptus laevopinea ( silvertop stringybark ), Eucalyptus melliodora ( yellow box ) and wild cherry.

Dead and dying Eucalyptus | River Red Gum s on the lower Murray near Berri, South Australia.

The lower slopes have communities of mixed gum and peppermint, including the Bogong Gum ( Eucalyptus chapmaniana ).

These grade into pure stands of Alpine Ash ( Eucalyptus delegatensis ) around 1100 metres ( 3800 ft ) elevation, and subalpine woodland of Snow Gum, ( Eucalyptus pauciflora ) above 1300 metres ( 4000 ft ).

Common vegetation growing in this zone include ; Blackbutt ( Eucalyptus pilularis ), Sydney Red Gum ( Angophora costata ), Water Gums ( Tristaniopsis laurina ), Bottlebrush ( Melaleuca sp.

File: Eucalyptus imlayensis stem. JPG | the critically endangered Imlay Mallee

The Mount Beerwah Mallee Red Gum Eucalyptus kabiana is also endemic and is named after the local Aboriginal Tribe and traditional owners the Kabi Kabi ( pronounced Gubbi Gubbi ).

** Bell-fruited Mallee, Eucalyptus preissiana

** Blackbutt Mallee, Eucalyptus zopherophloia

** Blue Mountains Mallee, Eucalyptus stricta

** Blue-leaved Mallee, Eucalyptus polybractea

** Book-leaf Mallee, Eucalyptus kruseana

** Cliff Mallee Ash, Eucalyptus cunninghamii-a tiny and rare mallee from a high rainfall region

** Darke Peak Mallee, Eucalyptus cretata

** Faulconbridge Mallee Ash, Eucalyptus burgessiana-a mallee from a high rainfall region

** Forrest's Mallee, Eucalyptus forrestiana

** Four-winged Mallee, Eucalyptus tetraptera

** Kybean Mallee Ash, Eucalyptus kybeanensis

** Lemon-flowered Mallee, Eucalyptus woodwardii

** Mangarlowe Mallee, Eucalyptus recurva

** Narrow-leaved Mallee, Eucalyptus angustissima

** Pear-fruited Mallee, Eucalyptus pyriformis

** Plunkett Mallee, Eucalyptus curtisii

** Round-leaved Mallee, Eucalyptus orbifolia

Bark detail of, Eucalyptus angophoroides, apple box

The box bark of Eucalyptus quadrangulata, or white box

Some vegetation in the Kings Plains woodland includes iron-barks, cypress pine, yellow box, stringy-barks, Eucalyptus trees, and apple box.

For the most part it is grassland, with trees only along the watercourses and around the normally dry lakes and depressions. The low woodland is dominated by black box ( Eucalyptus largiflorens ) and River Cooba ( Acacia stenophylla ).

Wattles ( Acacias ), native apples ( Angophora floribunda ), black sallee ( Eucalyptus stellulata ), Blakely's red gum ( Eucalyptus blakelyi ), Hillgrove box ( Eucalyptus retinens ), New England blackbutt ( Eucalyptus andrewsii ), broadleaved New England stringybark ( Eucalyptus caliginosa ), Manna gum ( Eucalyptus viminalis ), New England blackbutt ( Eucalyptus andrewsii ), New England peppermint ( Eucalyptus nova-anglica ), ribbon gum ( Eucalyptus nobilis ), silvertop stringybark ( Eucalyptus laevopinea ) wild cherry and yellow box ( Eucalyptus melliodora ) and stringybark ( Eucalyptus caliginosa ) trees are common across the Northern Tablelands.