Ipomoea purpurea L., belonged to Convolvulaceae, was an annual herb and it's stem twining. It was a typical entomophilous flower.It had a long flowering period (June to October), but a single flower lasted only a few hours. The floral nectar was secreted by a discoidal nectary surrounding the ovary base. The plant which had a extremely long overall, but short single flowering characteristics and had nectaries which could be separated from the body of the plant provided ideal experimental material for the st...