While these are not at all rare, perhaps because of the time of their bloom I see few of these wild orchids (and maybe because they are very easy to overlook in the tall grasses of mid-summer).
White or Boreal Bog Orchid, White Rein Orchid, Bog Candle, Scent Bottle, Platanthera dilatata
Western Rattlesnake Plantain, Green-leaf Rattlesnake Plantain, Goodyera oblongifolia
And, there are still other white blossoms too, even on their visitors.