I nearly fell off my chair when I saw specimens of the Heliconia zebrina being sold out at US$80 in a show in New York. It reminded me of a rather similar plant I had seen while wading in the small forest streams in Peninsula Malaysia 10 years ago. The impressive plants, up to about 2 metres tall, stood up amongst the uniformly green undergrowth in the cool shady banks due to their large stripped leaves. My first impression was that it was a garden escape - probably a type of Calathea from the New World ....except that we were at least 1 hour drive from the nearest village.
About a year later, I made another trip to the habitat but was dismayed that the forest had been cleared, for oil palm plantation, but that would be another story ....
Actually I was not the first to notice the vegetative similarity - Rodigas made a painting of this plant with stripped leaves and described it as Heliconia triumphans in 1882 from collections in Sumatra.
Although not common in trade, this plant is quite widely distributed from Malaysia to Borneo and Sumatra. It appears to favour shady wet stream banks or muddy places.
Notes on Malaysian Marantaceae and the Identity of Heliconia triumphans
Vol. 41, No. 3 (1986), pp. 725-731