About 30 cm high, with villous branchlets. Leaves closely set, about 4 mm long, petiolate, erect-spreading, slightly incurved, oblong, obtuse, convex and, at first, sparsely pilose on the dorsal surface, slightly concave and glabrous on the ventral surface, at first ciliate. Flower-heads about 6 mm wide, rotund or hemispheric. Bracts of the inner flowers lanceolate, ciliate. Bracteoles oblanceolate, sharply convex and villous on the dorsal surface, reaching to the middle of the sepals. Calyx-tube fluted, glabrous, adhering to the ovary except for a shallow cup-shaped upper part: calyx-lobes lanceolate, ciliate, reaching to the middle of the petals. Petals about 2-25 mm long, elliptic, cuneate at the base, obtuse, glabrous, white. Stamens reaching almost to the tips of the petals: anthers elliptic, apiculate. Ovary f inferior, densely villous on the upper part, with 2 uniovulate chambers: styles free, reaching to or shortly above the tips of the petals. Fruit unknown.
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Like B. thomae but leaves glabrous, calyx tube glabrous and styles longer (as long as or just longer than petals). Upper rocky mountain slopes.