Adenanthos linearis

Adenanthos linearis is a shrub in the family Proteaceae, characterised by narrow, linear leaves and the tubular, nectar-rich flowers typical of the genus. Like many Adenanthos species, its flowers are adapted for bird pollination, particularly by honeyeaters, making it a contributor to nectar resources within its shrubland community. Its foliage and structure also provide shelter for small fauna in the understorey.

The species is endemic to Western Australia, occurring within shrubland habitats characteristic of the region's biodiversity-rich southwest. Its distribution is naturally restricted, and it depends on specific soil and vegetation conditions associated with this habitat type.

The species is classified as Vulnerable, with a decreasing population trend. Two ongoing threats are recognised: problematic native species or diseases, most likely referring to root-rot pathogens such as Phytophthora cinnamomi, which is known to severely affect Proteaceae species in southwestern Australia by attacking root systems and causing dieback; and the conversion or disturbance of habitat associated with annual and perennial non-timber crop agriculture, which fragments and reduces the extent of native shrubland.

Conservation measures for this species are not extensively documented, but broader regional efforts in southwestern Australia include hygiene protocols to limit the spread of Phytophthora between sites, habitat protection within reserves, and monitoring of Proteaceae populations affected by dieback. Restriction of vehicle and foot traffic in sensitive shrubland areas is also used as a preventive measure against pathogen spread.

The species' outlook remains concerning given its restricted range, ongoing habitat pressure from agricultural land use, and the persistent, difficult-to-manage threat of introduced root pathogens, which together continue to drive population decline.