Petalochilus R.S.Rogers was one of the genera in the Orchidaceae family proposed in 2001 by DL Jones, MA Clements, IK Sharma, and AM Mackenzie in a paper entitled A new classification of Caladenia R.Br. (Orchidaceae). In that paper they proposed splitting Caladenia into six genera. This paper was followed by many others, some in support, some suggesting subgenera status, and others advocating keeping these species in Caladenia. This genus was never widely accepted and further taxonomic work by MA Clements, CG Howard CG1, and JT Miller published in 2015 did not support recognition of this genus as previously proposed. Information and photos of these species can be found on the Caladenia wiki page. Flowers in this genus have short broad segments with pink or white petals, a narrow leaf, and a lip with rows of free calli. It is very like the species in they named Stegostyla except that the flowers are not glandular outside and the dorsal sepal is subÂerect. The column often has red bars and the calli are smooth. The common name of this group is Fingers.
Petalochilus carneus (R.Br.) D.L.Jones & M.A.Clem. see Caladenia carnea R.Br.
Petalochilus pusillus (W.M.Curtis) D.L.Jones & M.A.Clem. see Caladenia pusilla W.M.Curtis.
See PBS wiki pages for these genera that were proposed to be split and in 2025 are included in Caladenia :
Arachnorchis, Cyanicula, Drakonorchis, Jonesiopsis, Stegostyla