Nothocalaïs troximoides

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Nothocalaïs troximoides grows in the northern Great Basin and in Columbia-Snake Rivers Plateau. It shows increased variability in Idaho and parts of Montana, probably as a result of introgression from N. nigrescens. This variability is most evident in the lower Snake River plain and adjacent Oregon, in dryland habitats characteristic of N. troximoides, where populations frequently include individuals with roots, leaves, and cypselae typical of N. troximoides but with unusually large involucres and phyllaries that are broadly lanceolate, acuminate, and densely speckled with purple.