Banksia subg. Isostylis

Banksia subg. Isostylis is a sub-genus of Banksia . It gathers three narrowly related species, all endemic of the South-western of the Western Australia. Let us tax with the sub-genus Isostylis are distinguished because they do not have large floral ears and the infrutescences in the shape of “cones” usually characteristic of the kind Banksia . The flowers on the contrary are grouped of flowerheads in the shape of dome, similar to the Inflorescence of the species of the kind Dryandra . The surface resemblance of the inflorescences of Isostylis to those of the kind Dryandra resulted in suggesting that this sub-genus was to be transferred in the kind Dryandra . However, beyond this resemblance, Isostylis is much more common with Banksia than with Dryandra . If a change were to intervene in the future, it would be more probably that to promote Isostylis with the row of kind.

It is generally admitted that the sub-genus Isostylis provides an intermediary evolution naire between Banksia and Dryandra , but the details are still discussed. Most recent taxonomic classification of the kind '' Banksia '' is founded on the assumption that Banksia sets up the most primitive group; that Isostylis is the most advanced group of the kind Banksia ; and that Dryandra is even more advanced. There exist two other assumptions: first is that Dryanda would be the most primitive group, followed by Isostylis and then by the other species of Banksia ; the other is that Isostylis would be the most primitive group, and that Dryandra and Banksia has Co-advanced starting from an ancestor of the type Isostylis .

There are three species of Banksia subg. Isostylis . The banksia with sheets of houx, Banksia ilicifolia , is widely distributed and relatively commun run. The two other species, Banksia cuneata and Banksia oligantha , rare and are threatened, and are protected within the framework from the Australian law on protection from environment and safeguarding from the biodiversity from 1999.

References

External bonds

Card of the sub-genus '' Banksia '' subg. '' Isostylis '' on the site '' Flora off Australia Online ''

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