Stahlianthus sp

Stahlianthus is a little known genus of smallish gingers from S. India and Indo China. There are probably a handful of species although new ones are continuously being identified. The most common species in horticulture is Stahlianthus involucratus, notably a red-leaf form which is interesting even when not blooming.

I have been growing this plant for many years now, which differs from S. involucratus by its narrow grass-like leaves. The flower appear out of a cup-like bract - very interesting but also very infrequent in our climate.

With the very limited literature that I have, I can only hazard a guess on it ID - probably Stahlianthus pedicelatus from the NE Thailand.

You can see its description here.