L. japonica is white flowered, but it is very very rampant and does not flower well in colder areas.
Yes i know its rampant /vigorous Eric, buthat can be an asset as well as a burden. Still like it all the same, perhaps because it is the first plant i grew from cuttings as a child. That may sound strange but it grew in the garden i grew up in and roots well from cuttings, so not a daft a 'first plant' as it may seem. Strangely enough when my interest in gardening reawoke when I moved to my current home, one of the first things i took as cuttings was the good old L japonica, which was growing almost wild in this garden at the time.
By the way the flowere are white mainly but as they age they do fade to yellow, producing a mixture of white and yellow flowers which is quite charming.