Despite being one of the more significant species in the Park, the jarrahs (Eucalyptus marginata) are amongst the least common of our eucalypt species. Historical logging and their susceptibility to the introduced Phytopthora dieback fungus has reduced their numbers dramatically, although remnant stands can still be found throughout some woodland areas. Jarrah trees produce cream coloured flowers from spring to early summer, before forming small, spherical shaped fruits, a favourite food item for many native parrot species.
Marri trees (Corymbia calophylla) are particularly common on the Swan Coastal Plain and can be found in abundance in the Park. These, and older growth jarrahs, are the largest trees in Whiteman Park, growing to heights in excess of 25 metres and a girth of 1.5 metres. The marri trees produce fruits commonly known as ‘honky nuts’ and are a favourite in the diet of many of the cockatoos which visit the Park daily. Their flowers occur from December to May, ranging from white to pink in colour.
Another common tree species is the coastal blackbutt (Eucalyptus todtiana), which is found in most areas of the Park. It can be distinguished from other trees by its somewhat elegant spreading habit. It has distinct, round shaped gumnuts, vastly different from the bell shaped ‘honky nuts’ of the marri. White to cream flowers bloom from January to April, with the commencement of its flowering season made obvious by the number of birds that flock to feed on the flowers and their nectar.
Flooded gums (Eucalyptus rudis) are notable in many of the dampland areas of the Park, particularly along the watercourse of Bennett Brook. Aptly named, the flooded gums will happily grow with their bases inundated in the water. From July to September, masses of white flowers cover the tree, which develop to form small, delicate fruit that differ greatly from many of the larger woody nuts of other Park eucalypts.
Remnant specimens of tuart (Eucalypt gomphocephala) are also found within Whiteman Park. These tall canopy trees have a limited range and are only found on the Swan Coastal Plain. The white flowers, not dissimilar to those on the jarrah, form between January and April.