''Isopogon longifolius'' is a species of flowering plant in the family

Proteaceae The Proteaceae form a family of flowering plants predominantly distributed in the Southern Hemisphere. The family comprises 83 genera with about 1,660 known species. Together with the Platanaceae and Nelumbonaceae, they make up the order Pro ...

and is endemic to the southwest of Western Australia. It is a shrub with simple, linear, or deeply divided leaves and sessile, spherical heads of silky-hairy, yellow flowers and spherical to oval cone.

Description

''Isopogon longifolius'' is a shrub that typically grows to a height of up to , its branchlets brownish to grey and hairy when young. The leaves are simple, linear to narrowly egg-shaped with the narrower end towards the base, sometimes deeply divided with two or three lobes, about long on a petiole about long. The flowers are borne in a spherical, sessile cluster up to about in diameter, each flower up to long, yellow and silky-hairy with a spindle-shaped pollen presenter up to long. Flowering occurs from November to January, and the fruit is a shaggy-hairy nut long, held in a more or less spherical to oval cone up to in diameter.

Taxonomy

''Isopogon longifolius'' was first formally described by botanist Robert Brown in '' Transactions of the Linnean Society of London'' in 1810. In 1891, German botanist

Otto Kuntze Carl Ernst Otto Kuntze (23 June 1843 – 27 January 1907) was a German botanist. Biography Otto Kuntze was born in Leipzig. An apothecary in his early career, he published an essay entitled ''Pocket Fauna of Leipzig''. Between 1863 and 1866 he ...

published '' Revisio generum plantarum'', his response to what he perceived as a lack of method in existing nomenclatural practice. Because ''Isopogon'' was based on '' Isopogon anemonifolius'', and that species had already been placed by Richard Salisbury in the segregate genus ''Atylus'' in 1807, Kuntze revived the latter genus on the grounds of priority, and made the new combination ''Atylus longifolius'' for this species. However, Kuntze's revisionary program was not accepted by the majority of botanists. Ultimately, the genus ''Isopogon'' was nomenclaturally conserved over ''Atylus'' by the International Botanical Congress of 1905.

Distribution and habitat

This species often grows on sandstone hills in heath or shrubland and is found on the

Stirling Range The Stirling Range or Koikyennuruff is a range of mountains and hills in the Great Southern region of Western Australia, south-east of Perth. It is over wide from west to east, stretching from the highway between Mount Barker and Cranb ...

, the Porongurup Range, near Albany, Walpole and Cranbrook and on the coast towards Bremer Bay.

Conservation status

''Isopogon longifolius'' is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.

References

External links

The Australasian Virtual Herbarium – Occurrence data for ''Isopogon longifolius''

Google images: ''Isopogon longifolius''
{{Taxonbar, from=Q18076678 Eudicots of Western Australia longifolius Plants described in 1810 Taxa named by Robert Brown (botanist, born 1773)