Hedychium densiflorum 

Description: A rather short growing species the thin stems grow up to 4ft tall.

It flowers in summer with its brilliant yellow inflorescence. In autumn the stems die down and the rhizomes remain dormant throughout winter.

Habitat: Eastern Himalayas to Northeast India. Found growing on shaded mud banks and also on rocks. The rhizomes are not buried under ground but grow on the surface of the rocks and on the ground. Seasonal grasses and leaf litter cover the rhizomes providing rich nutrients and shade. The roots form a dense mat on the rock/ground surface.