1	"Flower buds cylindrical; corollas 2.5–4.5 cm diameter; lobes reflexed; corona highly elevated like a pyramid, sometimes above the petals"	"Calotropis gigantea"
1	"Flower buds sub-globose; corollas 1.5–2.5 cm diameter, lobes erect or slightly recurved; corona not elevated beyond corolla lobes"	"Calotropis procera"