Another thank you to Krystyna Szulecka for sharing one of her photographs (posted in this thread via the BPotD submissions forum on the UBC BG Forums). Locate more of Krystyna’s images by searching for “Krystyna” on the FLPA web site.
The genus Elythranthera is endemic to southwestern Western Australia, and contains two species and one hybrid. Elythranthera emarginata, or the pink enamel orchid, has a slightly narrower distribution than its close relative the purple enamel orchid, or Elythranthera brunonis. The hybrid formed is a natural one, that is, it occurs in the wild without human intervention: Elythranthera ×intermedia.
An Australian stamp was issued for pink enamel orchid in 1986. A closer examination of the stamp reveals a spotted pattern on the outside of the petal. Fortunately, the photographer behind Terrestrial Orchids of Southwest Australia has documented these: Elythranthera.
A broader understanding of the orchid family can be gleaned from the Orchidaceae pages on the Royal Botanic Gardens, Kew site, e.g., orchid flower structure. Illustrations of orchid flower structure are available via the UK’s National Council for the Conservation of Plants and Gardens site.