| Merritt's white spider orchid | |
|---|---|
| |
| Caladenia longicauda subsp. merrittii near the Blackwood River | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Orchidoideae |
| Tribe: | Diurideae |
| Genus: | Caladenia |
| Species: | |
| Subspecies: | C. l. subsp. merrittii
|
| Trinomial name | |
| Caladenia longicauda subsp. merrittii | |
| Synonyms[1] | |
|
Arachnorchis longicauda subsp.merrittii (Hopper & A.P.Br.) D.L.Jones & M.A.Clem. | |
Caladenia longicauda subsp. merrittii, commonly known as Merritt's white spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three large, mainly white flowers with very long, drooping lateral sepals and petals, and a white broad labellum with relatively short labellum teeth. It is one of the largest spider orchids.