at first I thot these were Death Camas but they are Parry's Catchfly. I think it might be a cousin to our Mexican Silene?

Silene parryi: Upright tuft, leaves mostly basal. Stems with short hairs on lower section, glandular above. Basal leaves narrowly egg-shaped, 1–3 in. long, becoming smaller upward. Flowers 2–4 in loose clusters near top. Flower calyx with glands along ribs, 5 white or greenish petals. Petals divided into 4 rounded lobes, center lobes larger, 2 small rounded appendages at center of each petal. Grows on rocky slopes, in dry meadows, open forests of subalpine, at high elevations.