Help ID another Den. NOID!

[susiep]

I have had this plant for a couple years. It is very hearty and lives outside year round in the terrible Floida heat. I wish I knew what it was. It now has many canes and about 9 spikes. Second time blooming in 2008! The flowers are small (3") but very interesting. Twisted green horns, twisted white petals with purple striped lip. Many flowers on each spike. The leaves are very light green with smallish pointy leaves. Any ideas?