The white or alba form of the species. I purchased this last year and this is its first blooming for me. Two spikes, one on each side. The flowers aren't as full as some I've seen, but they are actually larger than my solid red gigantea. Interestingly, there are actually spots on the flowers. However, they aren't red/magenta, they are pale greenish yellow. The flowers and plant completely lack anthocyanins. In contrast, on my solid red gigantea, the plant itself is heavily pigmented.