Subumbellate inflorescence, with flowers 5-8 flowers; pedicels slender, 2-3 cm long, sparsely pubescent; flowers 4-5 cm in diameter; calyx tube outside glabrous or densely pubescent; calyx lobes triangular-ovate , 3- mm long, shorter than the calyx, or nearly as long, apex acute, entire, outside glabrous or nearly hairless, the inner surface is white hair; petals ovate, base shortly clawed, 2-2.3 cm long white, pink initially open to the red; stamens 20-25 (30) pieces, half of petal length; styles 5, dilute 4, slightly longer than stamens, base with white fluff.