In front, on the left, is the singular Cancer Root, or Naked Broomrape (Aphyllon uniflorum, Torr. & Gr.), a root-para- site allied to our Broomrapes, remarkable in having only one flower on each stem ; behind is the scarlet and yellow Columbine (Aquilegia canadensis, L.), with the purple Lady's Slipper (Cypripedium acaule. L.), in the centre; and the Pinxter Flower (Azalea nudiflora, L.), and the Stagger Bush (Andromeda mariana, L.), on the right.