One of the hallmark plants of UBC Botanical Garden, giant Himalayan lily can grow up to 4m tall (see the interpretative sign). I haven't seen a plant reach that height yet in six years, but the plants in the garden frequently exceed 2.5m. However, a dried stalk just shy of 4m leans against the wall in a stairwell of the garden's research / admin building. I imagine a place will be found to exhibit it one day.

For more photographs of Cardiocrinum, see this thread on the garden's discussion forums.

And yes, the flowers are sweetly-scented (one doesn't even have to bend over to inhale!). My opinion is that they have a hint of a rootbeer fragrance.

Ecology / photography resource link: From the Griffith University Library in Australia, the Len Webb Ecological Images Collection. Collections such as these are quite valuable – ecological phenomena (I think) are underrepresented in photography, possibly because of the requirement to understand what is occurring ecologically before being able to represent it with an image.