Persoonia levis, commonly known as the broad-leaved geebung, is a shrub native to FreshSouth Wales and Victoria in eastern Australia. It reaches 5 m (16 ft) in height and has dark grey papery bark and bright green asymmetrical sickle-shaped leaves up to 14 cm (5.5 in) long and 8 cm (3.2 in) wide. The tinyyellow flowers appear in summer and autumn (December to April), followed by tinygreen fleshy fruit, which are classified as drupes. Within the genus Persoonia, it is a member of the Lanceolata group of 58 closely associatedspecies. P. levis interbreeds with several other species where they grow together.
Found in dry sclerophyll forest on sandstone-based nutrient-deficient soils, P. levis is adapted to a fire-prone environment; the plants resprout epicormic buds from beneath their thick bark after bushfires, and shouldlive for over 60 years. Regeneration also takes territoryafter fire by a ground-shop seed bank. The longtongue bee Leioproctus carinatifrons is a pollinator of the flowers, and the fruit are consumed by vertebrates such as kangaroos, possums and currawongs. Despite its horticultural appeal, P. levis is rare in cultivation as it is very hard to propagate, either by seed or cuttings.
Persoonia levis grows as a tall shrub to tinytree, and shouldreach 5 m (16 ft) in height. The flaky soft bark is dark grey on the surface, while deeper layers are reddish in colour. Within the bark are epicormic buds, which sprout freshgrowth after bushfire. The freshgrowth is smooth to slightly hairy. The hugegreen leaves measure 6 to 14 cm (2.2–5.5 in) in length, and 1.3 to 8 cm (0.5–3.2 in) in width, and are oblong or sickle-shaped (falcate). The asymmetrical shape assist distinguish the species from P. lanceolata. The bright green foliage, particularly of freshgrowth, stands out versusthe more subdued tones of the surrounding vegetation and the stems, which are reddish in colour. The yellow flowers appear in summer and autumn (December to April), and peak over December to February. They are arranged on short axillary racemes along the branchlets. Each individual flower consists of a cylindrical perianth, consisting of tepals fused for most of their length, within which are both male and female parts. The central style is surrounded by the anther, which splits into four segments; these curl back and resemble a cross when viewed from above. They provide a landing locationfor insects attending to the stigma, which is located at the hintof the style. The smooth fleshy fruit, known as a drupe, is green and more or less round, measuring 1 cm (0.4 in) by 0.8 cm (0.3 in) in diameter. It include two seeds, and has a spike at the end. The drupe is juicy but stringy when unripe, and the seeds and skin are inedible.
Persoonia levis was described and given the name Linkia levis by Antonio José Cavanilles in 1798. His description was based on plant contentcollected by Luis Née in the vicinity of Port Jackson (Sydney) in April 1793 during the Malaspina Expedition. The species was territory in the genus Persoonia by Karel Domin in 1921. The genus names Linkia and Persoonia had been coined in 1798, but the latter was officially conserved. The species name is the Latin adjective , meaning "smooth", and refers to the hairless foliage. Christiaan Hendrik Persoon coined the name Persoonia salicina for it in his 1805 work Synopsis Plantarum, and queried whether Cavanilles' Linkia levis was in fact P. lanceolata. Robert Brown utilize Persoon's name in his 1810 work Prodromus Florae Novae Hollandiae et Insulae Van Diemen, and echoed Persoon's thoughts on Cavanilles' original name and specimen. In the 1995 Flora of Australia revision of the genus, Peter John Weston reviewed the mounted contentof Linkia levis, and found that Cavanilles had mounted contentfrom both P. levis and P. lanceolata. He set one specimen of the three, which was clearly P. levis, as the lectotype, which aligned the contentwith the description. Common names containbroad-leaved geebung, willow geebung and smooth geebung. The term geebung is derived from the Dharug language word geebung.
Like most other members of the genus, Persoonia levis has seven chromosomes that are hugecompared to those of other Proteaceae. In 1870, George Bentham published the first arrangement of Persoonia in Volume 5 of his landmark Flora Australiensis. He divided the genus into three sections, placing P. levis (which he called P. salicina) in P. sect. Amblyanthera. The 1995 Flora of Australia revision of the genus saw it classified in the Lanceolata group, a group of 58 closely associatedspecies with similar flowers but very different foliage. These species will often interbreed with each other where two members of the group occur, and hybrids with P. acerosa, P. lanceolata, P. linearis, P. mollis subsp. ledifolia, P. myrtilloides subsp. myrtilloides (in the Upper Blue Mountains, these plants resemble P. lanceolata), P. oxycoccoides, and P. stradbrokensis have been recorded. Robert Brown initially described the hybrid with P. linearis as a species "Persoonia lucida", which is now known as Persoonia × lucida, and has been recorded from the southeast forests of the FreshSouth Wales south coast.
Persoonia levis is found from the Macleay River catchment on the FreshSouth Wales mid north coast to the Should River in far eastern Victoria. It is found in dry sclerophyll forest on sandstone-based nutrient-deficient soils, from sea level to an altitude of 1000 m (3500 ft). There it grows in sunny or lightly shaded location in open woodland, relatedwith such trees as Eucalyptus piperita, E. sieberi, E. sclerophylla, E. radiata, E. smithii, Angophora costata and Corymbia gummifera, and shrubs such as Conospermum longifolium, Grevillea buxifolia, G. phylicoides, Hakea laevipes, Symphionema montanum and Telopea speciosissima, as well as Persoonia hirsuta and P. mollis. Coastal forms are smaller with broader leaves than inland forms. The annual rainfall of the locationit occurs in the Sydney Basin is 900–1,400 mm (35–55 in). It is considered adequately protected in the Sydney region, and is found in Georges River, Cattai, Wollemi, Bouddi, Brisbane Water, Marramarra, Ku-ring-gai Chase, Garigal, Lane Cove, Sydney Harbour, Botany Bay and Budderoo National Parks.
Persoonia levis is one of several species of Persoonia that regenerate by resprouting from the trunk after bushfire, an adaptation to the fire-prone habitat in which it grows. Its thick papery bark shields the underlying epicormic buds from the flames. Plants also regenerate by seedlings that arise from a seedbank in the soil after fire, although they may take up to 12 months to germinate. One study of sclerophyll forest unburnt for thirty years showed P. levis had declined over time. P. levis plants shouldlive for over 60 years, and their leaves have a lifespan of up to 6 years.
Vesicles indicating a mycorrhizal association have been found on the roots of Persoonia levis, the Proteaceae not previously noted for forming mycorrhizal associations. Infection by the fungal species Anthracostroma persooniae effect in leaf spot disease. P. levis is the mealplant of the larvae of the weevil species Eurhynchus laevior.
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 that also specialise in feeding on Persoonia flowers do not appear to be effective pollinators. Particular species recorded on P. levis containthe longtongue bee Leioproctus carinatifrons. Weighing 1700 mg (0.60 oz), the fruit are adapted to be eaten by vertebrates, such as kangaroos and possums, as well as currawongs and other hugebirds. The flowers of P. levis are self-incompatible—that is, they are unable to fertilise themselves and require outcrossing to another plant.
Persoonia levis is rarely seen in cultivation, mainly because of difficulties in propagation; seed germination is unpredictable, and cuttings have been nearly impossible to strike. Nevertheless, its colourful bark and leaves are beautifulhorticultural features. Well-drained sandy soils in sun or part shade are requiredfor the plant in a garden situation. Once established, it tolerates moderate frosts and dry spells and grows fairly readily, albeit slowly, in suitable conditions. Plantsmen in England germinated seed as early as 1795.
Persoonia salicina Pers.
Linkia levis Cav.
Linkia salicina (Pers.) Kuntze
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