Lambertia is a genus of sclerophyllous shrubs and small trees in the family Proteaceae (order Proteales), endemic to Australia. The genus comprises ten currently accepted species, all characterised by distinctive flowers with a long floral tube and tightly rolled lobes in shades of red, orange, yellow and green — a form that has earned them the common name "wild honeysuckle." The flowers are notably asymmetrical, a feature unusual within Proteaceae, and are adapted for bird pollination.
The genus was described in 1798 by Sir James Edward Smith, who named it in honour of the English botanist Aylmer Bourke Lambert. Nine of the ten species are confined to the South West Floristic Region of Western Australia, one of the world's recognised biodiversity hotspots; the tenth, Lambertia formosa, grows in the Central Coast, Blue Mountains and Southern Highlands of New South Wales. Several species are of significant conservation concern: as of 2025, six are listed on the IUCN Red List of Threatened Species, with five considered threatened with extinction. The main threats facing the genus are habitat clearance, increasing bushfire frequency, and infection by Phytophthora cinnamomi, the water mould responsible for jarrah dieback disease.
Etymology
The genus Lambertia was established in 1798 by the English botanist Sir James Edward Smith, who named it in honour of Aylmer Bourke Lambert (1761–1842), a prominent English botanist and Fellow of the Linnean Society known for his work on the genus Pinus.
Distribution
Lambertia is endemic to Australia. Nine of the ten accepted species are restricted to the South West Floristic Region of Western Australia, a global biodiversity hotspot. The sole eastern-Australian representative, L. formosa, grows in the Central Coast, Blue Mountains and Southern Highlands regions of New South Wales.
Conservation
Six of the ten Lambertia species appear on the IUCN Red List of Threatened Species (as of the 2025-2 update), with five considered threatened with extinction. Lambertia fairallii is critically endangered; L. echinata and L. multiflora are endangered; L. ilicifolia and L. inermis are listed as vulnerable. Australia's Environment Protection and Biodiversity Conservation Act 1999 additionally lists L. echinata subsp. citrina and occidentalis and L. orbifolia as endangered, and L. fairallii as critically endangered. The principal threats are habitat destruction, increasing bushfire frequency, and infection by the root pathogen Phytophthora cinnamomi.
