Luminous Petalachroa, a bioluminescent flowering plant of the Ethereal Petalachordata cluster, ranges 10-30 cm tall with slender stems adapted to tropical rainforest canopies. Its flowers have undulating, overlapping petals in soft blue and violet hues, featuring a luminescent orange core with bioluminescent glands emitting a 450-495 nm blue-green glow via luciferin-luciferase reactions at petal margins. Narrow leaves with subtle venation complement the display. Thriving in 20-30°C humid conditions, it uses gentle air currents to promote petal movement and luminescent signal dispersal. Specialized for nocturnal pollinators like moths, it supports nocturnal biodiversity but is endangered, necessitating urgent habitat conservation.