Allocasuarina portuensis
 Allocasuarina portuensis commonly known as the Nielsen Park She-Oak is an extremely rare plant growing in Sydney Australia. Encountered as a shrub or small slender tree up to 5 metres (16 ft) tall it has green drooping branchlets up to 27 cm (11 in) in length. It is dioecious that is male and female flowers are borne on separate plants.