Petrophile sessilis, known as conesticks, is a species of flowering plant in the family Proteaceae and is endemic to New South Wales. It is an erect shrub with rigid, needle-shaped, divided, sharply-pointed leaves, and oval, spike-like heads of silky-hairy, creamy-yellow flowers. Description Petrophile sessilis is an erect shrub that typically grows to a height of and has branchlets and leaves that are silky-hairy when young but become glabrous with age. The leaves are long and divided with rigid, sharply-pointed, needle-shaped pinnae usually less than long. The flowers are arranged on the ends of branchlets and in leaf axils in spike-like, oval heads long, with broadly egg-shaped involucral bracts at the base. The flowers are long, silky-hairy and creamy-yellow. Flowering mainly occurs from May to February and the fruit is a nut, fused with others in a oval head up to long. It can be distinguished from the related Petrophile pulchella by its finely hairy new growth. Taxonomy Petrophile sessilis was first formally described in 1827 by Josef August Schultes in the 16th edition of Systema Vegetabilium from an unpublished description by Franz Sieber. Distribution and habitat Petrophile sessilis grows on sandstone soils in heath, woodland and forest from the Central Coast to the Central and Southern Tablelands of New South Wales. References sessilis Flora of New South Wales Plants described in 1827 Taxa named by Josef August Schultes