Occasionally, multiple flower spikes can form. Seed separator of a silver banksia ( Banksia marginata) with winged seeds still cohering In most cases, the individual flowers are tall, thin saccate (sack-shaped) in shape. This can be most spectacular in B. prionotes (acorn banksia) and related species, as the white inflorescence in bud becomes a brilliant orange. When the styles and perianth parts are different colours, the visual effect is of a colour change sweeping along the spike. These are gradually released over a period of days, either from top to bottom or from bottom to top.
The style is much longer than the perianth, and is initially trapped by the upper perianth parts. The colour of the flowers is determined by the colour of the perianth parts and often the style. They similarly have capitate flower heads rather than spikes.ī. marginata flower spike before and after anthesisīanksia flowers are usually a shade of yellow, but orange, red, pink and even violet flowers also occur. Not all Banksia have an elongate flower spike, however: the members of the small Isostylis complex have long been recognised as banksias in which the flower spike has been reduced to a head and recently the large genus Dryandra has been found to have arisen from within the ranks of Banksia, and sunk into it as B. ser. A single flower spike generally contains hundreds or even thousands of flowers the most recorded is around 6000 on inflorescences of B. grandis. The character most commonly associated with Banksia is the flower spike, an elongated inflorescence consisting of a woody axis covered in tightly packed pairs of flowers attached at right angles. The flowers are arranged in flower spikes or capitate flower heads. Many species have differing juvenile and adult leaves (e.g., Banksia integrifolia has large serrated juvenile leaves). Leaves are usually arranged along the branches in irregular spirals, but in some species they are crowded together in whorls. The leaves of most species have serrated edges, but a few, such as B. integrifolia, do not. Sizes vary from the narrow, 1– 1 + 1⁄ 2 centimetre long needle-like leaves of B. ericifolia (heath-leaved banksia), to the very large leaves of B. grandis (bull banksia), which may be up to 45 centimetres long. The leaves of Banksia vary greatly between species. Banksia species that grow as shrubs are usually erect, but there are several species that are prostrate, with branches that grow on or below the soil. Trees of the largest species, B. integrifolia (coast banksia) and B. seminuda (river banksia), often grow over 15 metres tall, some even grow to standing 30 metres tall. However, these plants are threatened by a number of processes including land clearing, frequent burning and disease, and a number of species are rare and endangered.ĭescription Young Banksia inflorescence showing flower buds developing in pairsīanksias grow as trees or woody shrubs. Further, they are of economic importance to Australia's nursery and cut flower industries. They are an important food source for nectarivorous animals, including birds, bats, rats, possums, stingless bees and a host of invertebrates.
Heavy producers of nectar, banksias are a vital part of the food chain in the Australian bush. They are found in a wide variety of landscapes: sclerophyll forest, (occasionally) rainforest, shrubland, and some more arid landscapes, though not in Australia's deserts. : 1 Banksias range in size from prostrate woody shrubs to trees up to 30 metres (100 ft) tall. These Australian wildflowers and popular garden plants are easily recognised by their characteristic flower spikes, and woody fruiting "cones" and heads. Students also have the unique opportunity to pursue the Global Citizens Medal.Banksia is a genus of around 170 species of flowering plants in the family Proteaceae. Banksia Park International High School is a specialist entrepreneurial school where entrepreneurial skills for aspiring business and social entrepreneurs are developed, practiced and used every day across every area of the curriculum. The school is surrounded by native Australian parklands and is close to recreational parks, sporting facilities, and a major shopping and cinema complex. Banksia Park International High School is located in the north-eastern suburbs of Adelaide accessible by the fast-track transport system to the centre of Adelaide.
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