perideridia genus --- parsley family

Bolander's yampah (Perideridia bolanderi) -- in July -- Sheldon National Wildlife Refuge, NV   white & cream    NV-N

Bolander's yampah (Perideridia bolanderi) -- in June -- Steens Mountain Wilderness Area, OR

Parish's yampah (Perideridia parishii) -- in July -- Lassen Volcanic National Park, CA         white & cream