Quite a lovely thing that I've never seen in person. I tried growing this species from seed once but it was uncooperative with germination. In fact the entire genus platanthera tends to be intransigent with in vitro culture. P ciliaris and grandiflora tend to have better numbers than the rest.

Here is platanthera sparsiflora from southern Oregon: it is not the showiest plant but it is strongly redolent of honey which is its major redeeming quality. It's growing in a road ditch on a forest service road where it is commonly found.

Those are interesting plants, macranthos. FNA suggested they like bogs, fens, and other wet places, so I was surprised to see that they're relatively common in some of the more arid states (i.e. Utah, Colorado, Arizona, Nevada).

At least in Oregon, they are common in along tiny creeks and streams in otherwise completely arid places. However, they are most interesting in the actual darlingtonia bogs where they can spread out.