What you see...

... isn't necessarily what you get,

Lagging behind on the blip front as usual:  this is the flower spike of the early purple orchid which I bent over to show the long spurs behind each individual flower. To the foraging bee, these tubes suggest a well of nectar for the taking. But no, there's no nectar there.

However,  when inserting its tongue into the  spur, the bee's head engages with the upper part of the flower structure and receives a dollop of sticky pollen which it will carry to the next flower in its vain search for nectar.

Bumble and other sort of bees and flies tend to fall for this sort of duplicity in the early spring when they are inexperienced in the devious ways of plants, The orchids themselves, it is thought, rely on other flowers, especially the nectar-rich bluebell that shares the same habitat, to reward the insects and ensure they don't leave the area empty "handed". 

Both Wallace and Darwin famously predicted the existence of a moth with a exceptionally long tongue from the discovery of an orchid with an exceptionally long spur. The Madagascan Star Orchid does have a reward at the end, otherwise - why bother?

https://www.nhm.ac.uk/discover/news/2021/september/moth-predicted-to-exist-by-darwin-and-wallace-becomes-a-new-species.html