#ThreatenedSpecies of the Week: Northern Serrate Dryandra (Banksia serratuloides subsp. perissa)

The Northern Serrate Dryandra (Banksia serratuloides subsp. perissa) is listed as Critically Endangered under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) and Endangered under the WA Biodiversity Conservation Act 2016.

The Northern Serrate Dryandra is a low, compact shrub, growing to 1m tall and 1.2m in diameter, with crowded leaves on erect branches. The leaves are 19cm long and are paler on the underside. They are divided almost to the midrib forming 20–33 long flat lobes which are quite rigid. The flower heads are held in the leaf axils and are axillary, surrounded by lanceolate bracts. These bracts are hairless on the back and have white woolly margins, which later become smooth. The yellow flowers are about 2.5cm long and have a silky-hairy perianth. The long, hairless style has a narrow, furrowed, darker coloured stigmatic end. Flowering occurs from August to September.

The Northern Serrate Dryandra is endemic to Western Australia and is known from three populations, over 16 sites, north of Badgingarra. The Northern Serrate Dryandra grows in lateritic gravel and brown loam on ridge tops and slopes or in red-brown sand on lower areas. This subspecies favours areas of low dense heath but can also be found in low open woodland. Associated species include Wandoo (Eucalyptus wandoo), Drummond’s Gum (E. drummondii), Dwarf Sheoak (Allocasuarina humilis) and Banksia armata, Golden Dryandra (B. nobilis), Grey-leaved Beaufortia (Beaufortia incana), Silver Mallett (E. falcate), Brown Mallett (E. astringens), Salmon Gum (E. salmonophloia), Grevillea insignis and Hakea subsulcata.

The main potential threats to Northern Serrate Dryandra include dieback caused by the root-rot fungus Phytophthora cinnamomi, inappropriate fire regimes (including inappropriate prescribed burning), drought, roadwork, mining, land clearing, gravel extraction, firebreak maintenance and weeds. The response of this subspecies to fire is currently unknown and fire should be restricted until an appropriate regime is identified. Due to the locality of some populations on road verges, roadwork or other activities may adversely affect this subspecies.

 

Information Source: Government of Australia, Department of Environment and Energy and Department of Biodiversity, Conservation and Attractions, and Florabase.

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