Ebracteate, pedicellate, complete, hermaphrodite, actinomorphic, pentamerous, hypogynous, cyclic, large, red or variously coloured.
Epicalyx 5 or more, free, green.
Calyx made up of sepls 5, gamosepalous, campanulate, valvate, green.
Corolla made up of 5 petals, polypetalous but fused at the base, adnate, shape obovate and margin sinuous, twisted and red.
Androecium made up of many stamens, monadelphous, epipetalous, staminal tube fused with corolla and red in colour, anthers are monothecous, reniform, attached transversely to the filament, extrorse and red coloured.
Gynoecium composed of pentacarpellary, syncarpous, superior pentalocular, many ovules in each locule, axile placentation, styles 5, united below but free at their tips, stigmas 5, capitate, and coloured.
Fruit : 5-valved, loculicidal capsule
Seeds : Small, endospermic.
Flowering and Fruiting Time : July-December
Cultivated in gardens everywhere.
The buds are cooling and remove seminal weakness.
The petals are used to blacken shoes and hence the name is given.
The paste of petals is also applied on the hair for blackening.