Persoonia linearis, commonly known as the narrow-leaved geebung, is a shrub native to New South Wales and Victoria in eastern Australia.

Found in dry sclerophyll forest on sandstone-based nutrient-deficient soils, P. linearis is adapted to a fire-prone environment; the plants resprout epicormic buds from beneath their thick bark after bushfires.

[4] Meanwhile, German botanist Karl Friedrich von Gaertner had coined the name Pentadactylon angustifolium in 1807 from a specimen in the collection of Joseph Banks to describe what turned out to be the same species.

[8] Carl Meissner described a population from the Tambo River in Victoria as a separate variety, Persoonia linearis var.

[6] In 1919, French botanist Michel Gandoger described three species all since reallocated to P. linearis; P. phyllostachys from material collected at Mount Wilson sent to him by the herbarium at the Royal Botanic Gardens in Sydney, and P. walteri and P. breviuscula from Melbourne-based plant collector Charles Walter, whose records have been questioned.

[13] He described a variety sericea from the Shoalhaven River region and also noted the discrepancy in Robert Brown's description of the species.

These species will often interbreed with each other where two members of the group occur,[14] and hybrids with P. chamaepeuce, P. conjuncta, P. curvifolia, P. lanceolata, P. media, five subspecies of P. mollis, P. myrtilloides subsp.

[12] The yellow flowers appear in summer, autumn and early winter (December to July),[19] peaking over January and February.

P. linearis is described as auxotelic, which means each stalk bears an individual flower that is subtended by a leaf at its junction with the stem.

[12] The central style is surrounded by the anther, which splits into four segments; these curl back and resemble a cross when viewed from above.

In the Sydney Basin, it is associated with such trees as Sydney peppermint (Eucalyptus piperita), silvertop ash (E. sieberi), blue-leaved stringybark (E. agglomerata), blackbutt (E. pilularis), grey ironbark (E. paniculata), snappy gum (E. rossii), Sydney blue gum (E. saligna), narrow-leaved stringybark (E. sparsifolia) and smooth-barked apple (Angophora costata) and shrubs such as Grevillea obtusiflora, G. phylicoides, Kowmung hakea (Hakea dohertyi), long leaf smoke bush (Conospermum longifolium) and stiff geebung (Persoonia rigida).

[20] In the vicinity of Nowra and Jervis Bay, it is an understory component of the widespread Currambene Lowlands Forest community, alongside such plants as gorse bitter pea (Daviesia ulicifolia), bearded heath (Leucopogon juniperinus) and native daphne (Pittosporum undulatum) with spotted gum (Corymbia maculata), white stringybark (Eucalyptus globoidea) and woollybutt (E. longifolia) as the dominant trees.

[25] Colletid bees of the genus Leioproctus, subgenus Cladocerapis exclusively forage on and pollinate flowers of many species of Persoonia.

Bees of subgenus Filiglossa in the same genus, which also specialise in feeding on Persoonia flowers, do not appear to be effective pollinators.

[14] Weighing 1900 mg (0.07 oz), the fruit are adapted to be eaten by vertebrates, such as kangaroos, possums and currawongs and other large birds.

"[3] Joseph Knight reported that cuttings would be successful as long as material was "judiciously chosen", and that plants had set seed on occasion.

[7] A compound with antimicrobial activity was isolated from the ripening drupes of a hybrid of Persoonia linearis and P. pinifolia growing in the Australian National Botanic Gardens in 1994, and identified as 4-hydroxyphenyl 6-O-[(3R)-3,4-dihydroxy-2-methylenebutanoyl]-β-D-glucopyranoside.