Plants with caudex multi-stemmed, ultimate slender stems covered by persistent petiolar remains, terminating in rosettes; sparsely to densely pubescent. Stems 1-4 cm (leafless). Basal leaves tufted; petiole persistent becoming stramineous, 0.5-1 cm; blades narrowly oblanceolate to broadly linear, 0.5-1.8 cm × 1-2 mm, base attenuate, margins entire, apex obtuse. Fruiting pedicels 4-15 mm, pilose. Flowers: sepals purple, 4-5 × 1.5-2 mm; petals 4.5-6 × 1.7-2.3 mm; filaments 3.5-4.5 mm; anthers 0.5-0.7 mm; gynophore obsolete or to 1 mm. Fruits 1.5-3 cm × 5-9 mm; valves purplish, often glaucous, base obtuse, apex acute to acuminate; style 1-2 mm. Seeds brown, 2-3 × 1.2-1.5 mm. 2n = 14.

Flowering Jun-Jul. Rock slides of metamorphics, whitish ash, subalpine and alpine ridges, rock and talus slides, disintegrated volcanic rock; 1600-4000 m; Calif., Idaho, Nev.

Anelsonia eurycarpa has been collected from multiple counties in California; in Nevada it is known only from Washoe County and in Idaho only from Blaine and Custer counties.