Banksia Burdettii

''Banksia burdettii'', commonly known as Burdett's banksia, is a species of shrub or tree of the genus ''Banksia'' in the family Proteaceae. It occurs on sandplain country north of Gingin, Western Australia. Growing to 4 m (13 ft) in height, it has long serrated leaves and large, bright flower spikes, initially white before opening to a bright orange, that appear mainly in late summer (February and March). Edmund Gilbert Baker described ''B. burdettii'' in 1934, naming it after its collector, W. Burdett.

Description

''Banksia burdettii'' grows as an evergreen shrub to a height of . The new growth is hairy, though longer stems are smooth. The sturdy, serrated grey green leaves are long and wide with a narrow oblong or wedge-shape and a truncate tip. The toothed margins are slightly downcurved.

Burdett's banksia has cm high flower spikes, known as inflorescences, that prominently displayed on the ends of stems, appearing between the months of January and May, peaking over February and March. A 1988 field study in Watheroo National Park revealed that each flower spike has 972 ± 130 florets. The individual flowers are hairy and white on the outside and orange within, the flower spikes turning from white to orange as anthesis proceeds up the spike. Old flower spikes fade to grey over time, and develop up to 20 follicles (seed pods) each. Each follicle contains two seeds, though around 36% of seeds are nonviable. Almost all follicles remain closed until opened by bushfire.

Taxonomy

''Banksia burdettii'' was described in 1934 by Edmund Gilbert Baker, from a specimen grown from seed collected at Watheroo by one W. Burdett in 1930. Baker felt it had affinities to '' B. baueri'', '' B. prionotes'' and '' B. menziesii'', placing it in the series ''Cyrtostylis''. In 1981, Alex George published a revised arrangement that placed ''B. prionotes'' in the subgenus ''Banksia'' because of its flower spike, section ''Banksia'' because its styles are straight rather than hooked, and the series ''Crocinae'', a new series of four closely related species, all with bright orange perianths and pistils.

George's arrangement remained current until 1996, when Kevin Thiele and Pauline Ladiges published an arrangement informed by a cladistic analysis of morphological characteristics. Their arrangement maintained ''B. burdettii'' in ''B.'' subg. ''Banksia'', but discarded George's sections and his series ''Crocinae''. Instead, ''B. burdettii'' was placed at the end of series ''Banksia'', in subseries ''Cratistylis''. Questioning the emphasis on cladistics in Thiele and Ladiges' arrangement, George published a slightly modified version of his 1981 arrangement in his 1999 treatment of ''Banksia'' for the ''Flora of Australia'' series of monographs. To date, this remains the most recent comprehensive arrangement. The placement of ''B. burdettii'' in George's 1999 arrangement may be summarised as follows:
:''Banksia''
:: ''B.'' subg. ''Banksia''
::: ''B.'' sect. ''Banksia''
:::: ''B.'' ser. ''Salicinae'' (11 species, 7 subspecies)
:::: ''B.'' ser. ''Grandes'' (2 species)
:::: ''B.'' ser. ''Banksia'' (8 species)
:::: ''B.'' ser. ''Crocinae''
:::::''B. burdettii
:::::'' B. prionotes''
:::::'' B. hookeriana''
:::::'' B. victoriae''

Since 1998, American botanist Austin Mast has been publishing results of ongoing cladistic analyses of DNA sequence data for the subtribe Banksiinae, which includes ''Banksia''. With respect to ''B. prionotes'', Mast's results are fairly consistent with those of both George and Thiele and Ladiges. Series ''Crocinae'' appears to be monophyletic, and '' B. hookeriana'' is confirmed as ''B. prionotes'' closest relative. Overall, however, the inferred phylogeny is very different from George's arrangement. Early in 2007, Mast and Thiele initiated a rearrangement of ''Banksiinae'' by publishing several new names, including subgenus ''Spathulatae'' for the species of ''Banksia'' that have spoon-shaped cotyledons; in this way they also redefined the autonym ''B.'' subgenus ''Banksia''. They have not yet published a full arrangement, but if their nomenclatural changes are taken as an interim arrangement, then ''B. burdettii'' is placed in subgenus ''Banksia''.

Distribution and habitat

Found between Eneabba and Mogumber in Western Australia, ''Banksia burdettii'' is locally common where it occurs.

Ecology

''Banksia burdettii'' is very sensitive to bushfire, and plants are killed by even small fires, the old cones being highly combustible. More cones are burnt and opened in hot fires. This species is strongly serotinous: seed is released only following a fire. Thus plants accumulate a large number of viable seen in an aerial seed bank in fire intervals, which is released all at once after a fire, ensuring population regeneration. The resulting plants take around four or five years to flower, shorter than many other banksia species. Optimal fire intervals generally fall between ten and twenty years, though it will reproduce outside this range. Spring fires are thought to be more beneficial for reproduction due to more reliable rainfall and hence germination afterwards. Burnt follicles open with water, so may remain intact after dry spells to open.

The flowers are fed at (and pollinated by) a range of honeyeater species, including the white-cheeked honeyeater (''Phylidonyris nigra''), brown honeyeater (''Lichmera indistincta''), spiny-cheeked honeyeater (''Acanthagenys rufogularis''), red wattlebird (''Anthochaera carunculata'') and western wattlebird (''A. lunulata''). Carnaby's black cockatoos (''Calyptorhynchus latirostris'') eat seed from follicles, dropping old flower cones around the plant.

The honey possum (''Tarsipes rostratus'') also visits the flowers.

Weevils (Curculionidae) eat seeds, especially in older cones.

Use in horticulture

''Banksia burdettii'' is fairly easy to grow in areas with a Mediterranean climate, but does not do well in areas with high summer humidity. It requires a sunny position in well-drained soil. Once established the plant is resistant to both frost and drought, it prefers sun or light shade and well drained soils.

Seeds do not require any treatment, and take 20 to 42 days to germinate.

References

External links

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{{Taxonbar, from=Q4856565

burdettii
Eudicots of Western Australia
Plants described in 1934
Endemic flora of Western Australia