State Rank Reason (see State Rank above)
Phacelia lyallii is known from most major mountain ranges in western Montana. The number of occurrences plus its habitat preference (high elevation, alpine sites) significantly reduce any concerns for the species’ viability.
- Details on Status Ranking and Review
Score1-2 - Small to Moderate. Population size is imprecisely known but is believed to be >2,000 individuals and <100,000 individuals.
CommentAs most observation records are from specimen collections, population levels are poorly documented.
Score2 - Regional or State Endemic or Small Montana Range: Generally restricted to an area <100,000 sq. miles (equivalent to 2/3 the size of Montana or less) or Montana contributes 50% or more of the species’ range or populations OR limited to 2-3 Sub-basins in Montana.
Area of Occupancy
Score0 - High: Occurs in >25 Subwatersheds (6th Code HUC’s).
Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).
Score0-1 - Stable to Minor Declines:
CommentLikely stable to minor declines as its habitat is not being negatively impacted.
Score0-1 - Low to Medium.
Score0-1 - Low to Moderate Vulnerability.
Raw Conservation Status Score
4 to 8 total points scored out of a possible 19.
Perennial, often with a branched caudex. Stems ascending to erect, usually simple, 5–25 cm. Herbage sparsely strigose, hirsute above. Leaves mostly basal; blade 2–8 cm long, oblanceolate, pinnately lobed ca. halfway into deltoid segments. Inflorescence a densely flowered, compound, terminal cyme. Flowers: calyx hirsute 4–6 mm long; corolla campanulate, blue, pubescent, 5–9 mm long, lobes 3–5 mm long; stamens, exserted, ca. 2 times as long as corolla; style exserted, divided <1/2-way. Seeds several, reticulate (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)