Idaho Gooseberry - Ribes oxyacanthoides ssp. irriguum
Stems erect to ascending, 1–2 m with 1–3 straight nodal spines. Twigs puberulent with sparse bristles, brown becoming gray. Leaf blades 1–6 cm wide, cordate to truncate, 3- to 5-lobed, deeply crenate, glandular and/or pubescent on both surfaces. Inflorescence of 1 to 3 flowers, drooping. Flowers campanulate, green to red, 6–11 mm long, glabrous; calyx lobes oblong, 3–5 mm long; petals 2–3 mm long, white to pink; stamens ca. as long as the petals; styles united ca. half their length. Berry purple, 6–11 mm long, glabrous. Treated by Lesica (2012) as a distinct species (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Previous reports of Ribes cognatum in Montana are generally referrable here.