Banksia coccinea, commonly known as the scarlet banksia, waratah banksia or Albany banksia, is an erect shrub or small tree in the family Proteaceae. Its distribution in the wild is along the southwest coast of Western Australia, from Denmark to the Stokes National Park, and north to the Stirling Range, growing on white or grey sand in shrubland, heath, or open woodland. Reaching up to in height, it is a single-stemmed plant that has oblong leaves, which are long and wide. The prominent red and white flower spikes appear mainly in the spring. As they age, they develop small follicles that store seeds until opened by fire. Though widely occurring, it is highly sensitive to dieback, and large populations of plants have succumbed to the disease.
Collected and described by Robert Brown in the early 19th century, Banksia coccinea appears to be most closely related to Banksia speciosa and B. baxteri. Banksia coccinea plants are killed by bushfire and regenerate from seed. The flowers attract nectar- and insect-feeding birds, particularly honeyeaters, and various insects. Widely considered one of the most attractive Banksia species, B. coccinea is a popular garden plant and one of the most important Banksia species for the cut flower industry; it is grown commercially in several countries, including Australia, South Africa, Canada, the United States, New Zealand, and Israel. In cultivation, B. coccinea grows well in a sunny location on well-drained soil, but it cannot survive in areas with humid or wet summers.
Description
The scarlet banksia grows as an erect shrub or small tree, generally around tall, with little lateral spread. However, it can reach in height, particularly in the vicinity of Albany. The trunk is generally single at the base before branching, covered with smooth grey bark that is thick and lacking in lenticels. Peaking in the summer months, the pinkish-brown new growth is densely hairy. The oblong, cordate or obcordate leaves are long and wide, with long petioles. at the apex, they have dentate margins with small (1–3 mm long) teeth apart, separated by shallow u- or v-shaped sinuses. The upper surface is covered in fine fur when young and becomes smooth with age, while the undersurface is covered with white fur, particularly along the midrib.
The flowering process takes 9–12 months; the stems begin developing microscopically in spring, with no visible evidence of flower spike development for around five months before the buds actually appear. Flower spikes bloom from May to December or January, peaking between July and October. The distinctive inflorescences arise from the ends of one-year-old branchlets. Squat and roughly cylindrical, they are high and wide. A field study on the southern sandplains revealed an average count of around 286 individual flowers on each spike. The white flower is covered in grey or pale brown fur, with little variation in colour. The style is generally scarlet, but can be dark red, orange, or pink. The perianth is long, while the style is long and strongly recurved or looped until they are released at anthesis. Anthesis is acropetal; the flowers open from the base up the spike to the apex. The flowers of all banksias arise in a spiral pattern around the flower spike axis; however, in Banksia coccinea, they develop into distinctive vertical columns, strongly accentuated by large gaps in between. Paired in columns, the red styles contrast with the grey-white perianth, making a striking flower spike.
The infructescence is small, with up to 20 small follicles concentrated at the lower end of the spike. Each follicle is long, high, and wide and usually opens with fire. The long seed is composed of the cuneate (wedge-shaped) seed body proper, measuring long and wide, and a papery wing. One side, the outer surface, is grey-black and wrinkled, and the other—the inner surface—protrudes and is black and glistening. The seeds are separated by a dark brown seed separator, roughly the same shape as the seeds, with a depression where the seed body sits adjacent to it in the follicle. It measures long and wide. The dull green cotyledons of seedlings are long and wide, described by Alex George as "cuneate to obovate". Each cotyledon has a auricle at its base. The thick, smooth hypocotyl is high and 1.5 mm thick. The seedling leaves are crowded above the cotyledons and linear to spathulate in shape, with recurved and deeply serrated margins with v-shaped sinuses, almost dividing the leaves into triangular lobes. The first pair is long, with the next 2–4 leaves up to long. Successive leaves are more obovate in shape and up to long and wide. The seedling stems are covered in white hair.
Taxonomy
Discovery and naming
The first known specimens of Banksia coccinea were collected in December 1801, during the visit to King George Sound of HMS Investigator under the command of Matthew Flinders. Botanist Robert Brown, botanical artist Ferdinand Bauer, and gardener Peter Good were on board. All three men gathered plant specimens, but those collected by Bauer and Good were incorporated into Brown's herbarium without attribution, so it is impossible to identify this species's actual collector. The surviving specimen of B. coccinea, held by the Natural History Museum in London, is annotated in Brown's hand "King George IIIds Sound Princess Royal Harbour especially near the observatory". The observatory was apparently located in what is now the central business district of Albany. No further information on the collection is available, as the species is mentioned in neither Brown's nor Good's diary.
Good also made a separate seed collection, which included B. coccinea, and Bauer drew the species. Like nearly all of Bauer's field drawings of Proteaceae, the original field sketch of B. coccinea was destroyed in a Hofburg fire in 1945. However, a watercolour painting by Bauer, based on his field sketches, still survives at the Natural History Museum in London, and a hand-coloured copper engraving from that painting was published as Plate 3 of Bauer's 1813 Illustrationes Florae Novae Hollandiae. German botanist Adalbert Schnizlein described B. purpurea in 1843, now regarded as a synonym of B. coccinea. Common names include scarlet banksia, waratah banksia, and Albany banksia.
Brown published the species in his 1810 On the Proteaceae of Jussieu, its species name derived from the Latin coccineus meaning 'scarlet', and referring to the pistils. He recorded 31 species of Banksia in his 1810 work Prodromus Florae Novae Hollandiae et Insulae Van Diemen, and, in his taxonomic arrangement, placed the taxon in the subgenus Banksia verae, the "true banksias", because the inflorescence is a typical Banksia flower spike. By the time Carl Meissner published his 1856 arrangement of the genus, there were 58 described Banksia species. Meissner divided Brown's Banksia verae, which had been renamed Eubanksia by Stephan Endlicher in 1847, into four series based on leaf properties. He placed B. coccinea in the series Quercinae.
George Bentham published a thorough revision of Banksia in his landmark publication Flora Australiensis in 1870. In Bentham's arrangement, the recognised Banksia species were reduced from 60 to 46. Bentham defined four sections based on leaf, style, and pollen-presenter characters. Banksia coccinea was placed in section Orthostylis.
In 1891, Otto Kuntze, in his Revisio Generum Plantarum, rejected the generic name Banksia L.f., because the name Banksia had previously been published in 1776 as Banksia J.R.Forst & G.Forst, referring to the genus now known as Pimelea. Kuntze proposed Sirmuellera as an alternative, referring to this species as Sirmuellera coccinea. This application of the principle of priority was largely ignored by Kuntze's contemporaries, and Banksia L.f. was formally conserved, and Sirmuellera rejected in 1940.
Alex George published a new taxonomic arrangement of Banksia in his classic 1981 monograph The genus Banksia L.f. (Proteaceae). Endlicher's Eubanksia became B. subgenus Banksia, divided into three sections. George placed Banksia coccinea in its own series—Banksia series Coccineae—within the section B. section Banksia on account of a unique combination of characters, namely the vertical arrangement of flowers on the spike, combined with the branched open habit, broad leaves, and very small follicles. Members of the series Quercinae and five species within the series Spicigerae share the vertically aligned flowers, but do not wholly exhibit the other characters.
Kevin Thiele and Pauline Ladiges published a new arrangement for the genus in 1996; their morphological cladistic analysis yielded a cladogram significantly different from George's arrangement. They were uncertain of B. coccineas placement as it had highly autapomorphic characteristics, which made analysis of its relationships difficult. Hence, in their arrangement, it was located within the series Banksia but not allocated to a subseries (incertae sedis). It was reclassified in its own section, Coccinea, in 1996 by Tina Maguire and colleagues; pollen compatibility tests indicated its pollen was most compatible with Banksia ericifolia, B. micrantha, and B. sphaerocarpa, all of section Oncostylis. However, they did not place it in that section as all members of Oncostylis have hooked styles at anthesis. George upheld this in his monograph for the Flora of Australia series. B. coccinea's placement within Banksia, according to the Flora of Australia, is as follows:Genus BanksiaSubgenus BanksiaSection Banksia sect. CoccineaeB. coccinea
In 2002, a molecular study by Austin Mast again showed Banksia coccinea to be the next closest relative of a group comprising Banksia speciosa and B. baxteri and only distantly related to other members of the series Banksia. This was reinforced in a 2013 molecular study by Marcel Cardillo and colleagues using chloroplast DNA and combining it with earlier results.
Mast, Eric Jones, and Shawn Havery published the results of their cladistic analyses of DNA sequence data for Banksia in 2005. They inferred a phylogeny greatly different from the accepted taxonomic arrangement, including finding Banksia to be paraphyletic with respect to Dryandra. A new taxonomic arrangement was not published at the time, but early in 2007, Mast and Thiele initiated a rearrangement by transferring Dryandra to Banksia, and publishing B. subgenus Spathulatae for the species having spoon-shaped cotyledons; in this way, they also redefined the autonym B. subg. Banksia. They foreshadowed publishing a full arrangement once DNA sampling of Dryandra was complete. In the meantime, if Mast and Thiele's nomenclatural changes are taken as an interim arrangement, then B. coccinea is placed in B. subg. Banksia.
No subspecies are recognised, although DNA analysis showed that a population at Redmond was genetically distinctive, while those at Gull Rock, Two Peoples Bay, and Cheyne Beach were unusually diverse.
Noongar people know the tree as Waddib'''.
Distribution and habitatBanksia coccinea occurs close to the south coast of Western Australia, from the Hay River northeast of Denmark, Albany in the west, east to Stokes National Park southeast of Munglinup, and inland to the Stirling Range and the northern border of Fitzgerald River National Park. Around 47% of plants are protected in conservation areas, while 13% are on road verges. It prefers deep white or grey sand, among tall shrubland, heath, mallee-heath, associated with such species as B. baxteri, B. speciosa, B. attenuata, and Lambertia inermis, or low open woodland in the Stirling Range and near Albany, where it is found with Eucalyptus marginata, Banksia attenuata, and B. ilicifolia. Most of its range has a gently undulating topography, but it also occurs on a steep rocky slope at Ellen Peak in the Stirling Ranges. The annual rainfall is .
Ecology