Caladenia harringtoniae, commonly known as the pink spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single, hairy leaf and up to three pale to deep pink flowers which have a cream-coloured labellum with a pink tip. Description Caladenia harringtoniae is a terrestrial, perennial, deciduous, herb with an underground tuber and a single erect, hairy leaf, long and wide. Up to three flowers long and wide are borne on a stalk tall. The flowers are pale pink to deep pink with spreading lateral sepals and petals. The dorsal sepal is erect, long and wide, the lateral sepals are long and wide and the petals are long and wide. The labellum is cream-coloured, long and wide with a pink tip. The sides of the labellum have erect, spreading, red teeth up to long and there are four rows of pink calli up to long, along the centre of the labellum. Flowering occurs from mid-September to early November. Taxonomy and naming Caladenia harringtoniae was first described in 2001 by Stephen Hopper and Andrew Phillip Brown from a specimen collected near Pemberton and the description was published in Nuytsia. The specific epithet (harringtoniae) honours Alison Harrington, a president of the Western Australia Native Orchid Study Group. Distribution and habitat The pink spider orchid occurs between Nannup and Albany in the Jarrah Forest and Warren biogeographic regions, where it grows swamps and flat areas that are flooded in winter. Conservation Caladenia harringtoniae is classified as "Threatened Flora (Declared Rare Flora — Extant)" by the Western Australian Government Department of Parks and Wildlife and as "vulnerable" by the Australian Government Environment Protection and Biodiversity Conservation Act 1999. The main threats to the species are fire during its growth and flowering period, grazing by feral pigs (Sus scrofa) and road maintenance activities. References harringtoniae Orchids of Western Australia Endemic orchids of Australia Plants described in 2001 Endemic flora of Southwest Australia Taxa named by Stephen Hopper Taxa named by Andrew Phillip Brown