Drosera callistos is a pygmy sundew with metallic orange flowers. The species is named for its beautiful appearance (callistos = beautiful).
Drosera callistos has a flat rosette of leaves with straight petioles are round laminae. The rosette grows to around 2cm in diameter. The flowers are a metallic orange, black at the center and around 2 cm in diameter. The petals are mostly oval-shaped with dark veins on the underside. The three stigmas are clavate (club shaped; thicker at the apex compared to the base), slightly thick and sometimes slightly curved upwards. The filaments supporting the anthers are black to maroon.
The species is found in the Darling Scarp east of Perth where it inhabits heavy laterite soils. It comes to bloom in spring and is dormant over summer.
Drosera callistos is superficially similar to the other orange flowered pygmy Drosera which also grow in the Darling Scarp, most of which also have black centres. It is distinguished from the other species by its three clavate stigmas, which are club-shaped and slightly thickened along their length. This is specifically contrasted with the longer, thinner stigmas of Drosera miniata and D. bindoon. It also grows in close proximity to Drosera hyperostigma and D. platystigma, which have stigmas that are rounded and supported on thin styles. The stigmas are similar in shape to D. leucoblasta but the petals are generally broader (the petals of D. leucoblasta are thinner and the colour scheme of the centre of the flower is variable).