Hymenothrix dissecta

Strother's treatment in FNA (2006, vol. 21) recognizes Amauriopsis dissecta, saying "Resurrection of Amauriopsis, which was included in Bahia Lagasca by W.L. Ellison (1964), is predicated largely on the work of B.G. Baldwin et al. (2002)." Baldwin and Wood (2016) find that the taxonomy is simplified by merging Amauriopsis and Hymenothrix into "a common, monophyletic genus characterized within the Bahia alliance in part by alternate leaves, obtuse to acute style-branch apices, often zygomorphic disc corollas (of outer florets), and pappus scales generally >= 10 or absent" and that "Hymenothrix has priority for such a group."

This is a wide ranging perennial herb occurring across a large area of the western United States and northwestern Mexico. With a large range extent, over 300 occurrences, abundant habitat, and broad habitat preferences, this species is considered secure.

This species occurs in the western United States and northwestern Mexico from southeastern Wyoming, west-central South Dakota, and northern Utah south to Baja California, Sonora, and southwest Texas. Range extent was estimated using herbarium specimens and photo-based observations documented between 1992 and 2023 (GBIF 2023, iNaturalist 2023).

By applying a 1 km separation distance to herbarium records and photo-based observations documented between 1992 and 2023, it is estimated that there areover 300 occurrences rangewide (GBIF 2023, iNaturalist 2023).