State Rank Reason (see State Rank above)
Scattered across a wide area of the state, nowhere common within its habitats. Regional endemic species with three regionally endemic varieties.
Acaulescent. Herbage silky-sericeous with mostly long, white hairs. Leaflets 7 to 15, lanceolate, 5–15 mm long. Stipules membranous, adnate to the petiole, pilose, basally connate. Inflorescence of 5 to 20 flowers, 5–12 cm high including the peduncle. Flowers magenta, often fading purple; calyx densely white-villous, with shorter appressed black hairs; sepals 3–5 mm long, narrowly lanceolate; banner 13–18 mm long. Legumes spreading, 1–2 cm long, white-pilose, inflated, enclosed in or exserted from the calyx (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Plants in Montana are variety atropurpurea
(Rydb.) Barneby, variety lagopus
, or variety conjugans
Sparsely-vegetated, stony soil of grasslands, steppe, dry woodlands, often on limestone; valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)