Flowers solitary bisexual with five large petaloid sepals white blue or yellow to 4 cm in diameter at the terry forms there are a number of 24 Petals transformed into nectaries

Could you correct the punctuation please?
Flowers solitary, bisexual, with five large petaloid sepals white, blue or yellow, to 4 cm in diameter at the terry forms - there are a number of 2-4. Petals transformed into nectaries.