Montana Field Guide

DRAFT: Requesting feedback on the 2026 revised rank, factors, and State Rank Reason outlined below and in the Conservation Status Rank Report. Senecio integerrimus var. scribneri is rare to uncommon in central and eastern Montana where it is found in grasslands and sage steppe habitats. Almost all recent observations are from northcentral Montana. The species is poorly documented with population sizes and extent unknown. The extent and quality of available habitat is also undocumented. It is also known from approximately 10 historical collections. Whether these are still extant or if the habitat is still intact in these areas is unknown. Threats to specific populations have not been identified though the species generally occurs in areas that have been converted to agriculutre, used for livestock grazing, are susceptible to invasive species or may be impacted by severe drought. Due to the combination of its rarity, unknown population sizes, unknown trends and potential threats, it appears to be at least vulnerable to extirpation in the state. Surveys of existing occurrences are greatly needed to document population sizes and extent, and to document habitat quality and threats. Additional surveys are needed in areas of potentially suitable habitat to document the presence/absence of additional populations.