I must admit I was a bit concerned about the width of the leaves in some pictures, but from your link "The leaves of M. albida are lanceolate and sessile, while the leaves of M. linearis are linear and have short stalks." I would have said the ID plant leaves are sessile from memory and what I can see in the pictures. If we go back there anytime soon I'll see if I can find any plants that are more accessible.
In the note for M. albida in volume II of An Illustrated Flora of the Northern United States and Canada (which is where I found it under a synonym Allionia albida) it says "Consists of numerous races, differing in pubescence and width of leaves" so that might explain the variable width in pictures via Google.
