I have previously posted on the white butterfly ginger (Hedychium coronarium var. coronarium) and mentioned that there are other varieties of this beautiful frgrant flower.
In the garden, we had the yellow butterfly ginger (H. coronarium var. coronarium) as a small tiny offset. It is now 3' tall and in bloom - producing flowers that are just as fragrant as the white butterfly ginger but even better with the yellow centre in the flowers.
Do make sure you have one in the garden!