Clematis columbiana var. tenuiloba
Brittonia 25: 382. 1971.
Stems mainly subterranean, rhizomatous, aerial stems not viny, mostly less than 0.1 m (to 1.5 m in forms transitional to var. columbiana), tufted. Leaf-blade mostly 3-ternate, ± succulent; leaflets or lobes mostly 1.5-5 mm wide. Flowers: sepals violet-blue, 1.5-5 cm. 2n = 16.
Phenology: Flowering late spring–early summer.
Habitat: Cliffs, rocky summits, usually in open sites or open pine forest
Elevation: 1000-3000 m
Colo., Mont., N.Dak., S.Dak., Utah, Wyo.
"thin" is not a number.