String of Arrowleaf Balsamroot
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The Arrowleaf balsam is a member of the aster family. As you'll see from MOCKBA's helpful comments below, it's very similar to the Northern mule's ears, also of the aster family. I would identify these as Northern mule's ears, though MOCKBA may not agree.
Here is a good link with a picture of the two species next to each other.
This string of plants was found near Christian Pond in the network of trails around Two Ocean and Emma Matilda Lakes in Grand Teton NP, late June 2008.