I'm not sure whether ours is a Doryanthes palmeri, or excelsa. Both are giant lilies
but the Palmeri droops with the weight of the blooms when it opens. We have waited 15 years
for ours to flower. I did see these growing alongside the Clarence River along
the north-east coast of N.S.W. many years ago - after we had planted our little seedling,
now ours is a GIANT too, the strappy leaves are 3 metres+ tall, and the stem of this
"flower" is 4 metres or more, hence the difficulty getting a photo to show you.

We're heading up to Cairns in northern Queensland in a couple of weeks time, and
hoping our flower doesn't decide to bloom while we're away! At least I will now
have a record of the fact that it has a flower bud!

PS. Palmeri is named after a Premier of Queensland, not a palm tree.
Background is a lilly pilly tree that young koalas like to sleep in, but not eat.