Banksia subg. Isostylis

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Banksia subg. Isostylis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Banksia
Subgenus: Banksia subg. Isostylis
R.Br.
Species

Banksia subg. Isostylis is a subgenus of Banksia. It contains three closely related species, all of which occur only in Southwest Western Australia. Members of subgenus Isostylis have dome-shaped flower heads that are superficially similar to those of B. ser. Dryandra, but structurally more like reduced versions of the "flower spikes" characteristic of most other Banksia taxa.

There are three species of Banksia subg. Isostylis, B. ilicifolia (holly-leaved banksia), B. cuneata (matchstick banksia) and B. oligantha (Wagin banksia). B. ilicifolia is widely distributed and relatively common, but the other two species are rare and threatened.

Description

Banksia subg. Isostylis shares with

woolly coating, whereas Dryandra follicles are thin and hairless; and the involucral, common and floral bracts of Isostylis are unlike those of Dryandra.[1]

The Isostylis species are all upright shrubs or trees, with a single trunk. They generally have

entire leaves.[2]

Taxonomy

Taxonomic history

Branch of B. cuneata

Banksia subg. Isostylis was first published by Robert Brown in his 1810 Prodromus Florae Novae Hollandiae et Insulae Van Diemen; thus its full name, with author citation, is Banksia subg. Isostylis R.Br.[3] Brown's arrangement was the first infrageneric arrangement of Banksia, making B. subg. Isostylis Banksia's first infrageneric taxon.[4] Brown erected B. subg. Isostylis to contain B. ilicifolia, which was then the only known Banksia with a dome-shaped inflorescence. He did not explicitly name a type species for the subgenus,[4] but B. ilicifolia is treated as the type because it was the only member when the subgenus was published.[1]

Twenty years later, Brown issued a supplement to his Prodromus entitled

Supplementum Primum Prodromi Florae Novae Hollandiae; another nine Banksia species were published, but there was no change to the 1810 arrangement, and no new Isostylis species.[5]

In 1846,

rank in his Histoire Naturelle des Vegetaux: Phanerogames. This was not accepted, and Isostylis (R.Br.) Spach is now considered a nomenclatural synonym of B. subg. Isostylis.[6]

When

Swan River in Western Australia
. This was later overturned.

In 1905,

conserved
, and his four names are now considered taxonomic synonyms of their respective names under Banksia L.f. None of them are considered members of Isostylis.

The next change to Isostylis came in 1981, when

Dryandra, which was then a distinct genus. He argued, however, that the similarities between Isostylis and Dryandra were largely superficial, whereas the similarities with Banksia were much more important taxonomically. His conclusion was that the taxon should remain in Banksia, although he did not rule out promoting it into a separate genus. A third B. subg. Isostylis species, B. oligantha
, was published by George in 1988.

In 1996, Kevin Thiele and Pauline Ladiges published a revised arrangement based on a cladistic analysis of morphological characters of Banksia. They took up the question of an affinity of Isostylis with Dryandra, finding George's arguments unconvincing but failing to find any further evidence for or against Isostylis's placement within Banksia. They eventually accepted both of George's subgenera, using each as an outgroup in the analysis of the other. Thus their analysis yielded no information about the circumscription and placement of Isostylis, and their arrangement maintained Isostylis as a subgenus.[7]

Thiele and Ladiges' arrangement was not accepted by George, and was largely discarded by him in his 1999 arrangement. The placement and circumscription of B. subg. Isostylis was unaffected and can be summarised as follows:[2]

B. cuneata grows as a large shrub, up to three metres in height.
Banksia
B. subg. Banksia (3 sections, 11 series, 73 species, 11 subspecies, 14 varieties)
B. subg. Isostylis
B. ilicifolia
B. oligantha
B. cuneata

Since 1998,

Banksiinae. His analyses has provided compelling evidence for the paraphyly of Banksia with respect to Dryandra, and suggest an overall phylogeny that is very greatly different from George's arrangement. Mast's results clearly recognise Isostylis as a distinct clade, but place it in a fairly recent position, within a clade that also contains B. elegans (Elegant Banksia) and B. attenuata (Candlestick Banksia). It falls a substantial distance from Dryandra, suggesting that similarities between those two groups are indeed superficial.[8][9][10]

Early in 2007, Mast and Thiele initiated a rearrangement of Banksia by merging

Dryandra into it, and publishing B. subg. Spathulatae for the species having spoon-shaped cotyledons. They foreshadowed publishing a full arrangement once DNA sampling of Dryandra was complete; in the meantime, B. subg. Isostylis has been set aside. If maintained at all in Mast and Thiele's forthcoming arrangement, it will be at a lesser rank than subgenus.[11]

Relationships within B. subg. Isostylis still remain unclear. Though Mast's studies found B. cuneata to be the most basal of the three species,

biogeographical factors suggest that B. ilicifolia would be the most basal of the three species: it occurs in the High Rainfall Zone where relictual species are most common, whereas the others are restricted to the Transitional Rainfall Zone, where more recently evolved species are most common.[12]

Distribution

Distribution of the three B. subg.Isostylis species: B. ilicifolia (red), B. cuneata (green), and B. oligantha (blue)

Species of B. subg. Isostylis occur only in

South West Botanical Province. B. ilicifolia is widespread within 70 kilometres of the coast from Mount Lesueur in the north, south to Cape Leeuwin and east to Albany. The other two species occur further inland, and have quite limited distributions. B. cuneata occurs Brookton and Bruce Rock in the Avon Wheatbelt biogeographic region; while B. oligantha occurs slightly further south, in the vicinity of Wagin.[2][13]

Ecology

Ecologically, B. subg. Isostylis is similar to other Banksias. As with other Banksia taxa, all three species have

aerial seed bank following a bushfire. This adaptation, known as serotiny
, ensures the rapid regeneration of populations killed by fire.

B. cuneata and B. oligantha have been declared rare under both Western Australia's Wildlife Conservation Act 1950, and the federal Environment Protection and Biodiversity Conservation Act 1999. Threats include loss of habitat, Phytophthora cinnamomi dieback, and grazing on seedlings by feral rabbits.[14][15]

Cultivation

None of the B. subg. Isostylis species are popular in cultivation. The two rare species are virtually unknown in cultivation. B. ilicifolia is better known, but its usefulness as an amenity plant is limited by the fact that it has very prickly leaves.[16]

References

  1. ^ a b c George, Alex S. (1981). "The Genus Banksia L.f. (Proteaceae)". Nuytsia. 3 (3): 239–473.
  2. ^
    ISBN 0-643-06454-0
    .
  3. ^ "Banksia subgen. Isostylis R.Br". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
  4. ^ a b Brown, Robert (1810). Prodromus Florae Novae Hollandiae et Insulae Van Diemen. London: Taylor.
  5. Supplementum Primum Prodromi Florae Novae Hollandiae
    . London: Taylor.
  6. ^ "Isostylis (R.Br.) Spach". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
  7. doi:10.1071/SB9960661
    .
  8. doi:10.1071/SB97026
    .
  9. ^
    PMID 21665734
    .
  10. doi:10.1071/SB04015
    .
  11. doi:10.1071/SB06016
    .
  12. S2CID 39559876
    .
  13. ISBN 0-644-07124-9
    .
  14. ^ Banksia cuneata — Matchstick Banksia, Quairading Banksia, Species Profile and Threats Database, Department of the Environment and Heritage, Australia.
  15. ^ Banksia oligantha — Wagin Banksia, Species Profile and Threats Database, Department of the Environment and Heritage, Australia.
  16. ISBN 0-86417-006-8
    .

External links

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