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. Hornungia procumbens is rare in Montana, where it is known from approximately a half dozen widely scattered locations. Population levels are poorly known though appear to number at least a few thousand plants and perhaps much higher. Populations likely fluctuate widely from year to year as the plant is an annual. Trends are largely unknown though have likely been relatively stable in the recent past though the species may have declined over the long-term as a result of habitat modification and degradation. No significant and imminent threats have been documented. However, climate change, livestock grazing and non-native species may negatively impact one or more occurrences, though the magnitude and immediacy of any impacts is uncertain. The species' rarity, in conjunction with uncertainty surrounding potential threats and possible declines in populations over the long-term lead to uncertainty in the species rank. Surveys of the known occurrences are needed to collect current information on population levels and extent, habitat quality and potential threats. Monitoring of a subset of populations is needed to determine potential population trends.