Identified as Cissus verticillata 'Albonitens', Curtain Ivy, Princess Vine, Millionaire Vine.
Generally known as Cissus albonitens, Cissus sicyoides 'Albonitens' or Cissus sicyoides albo-nitens.Cissus albonitens and Cissus sicyoides are both listed as synonyms of Cissus verticillata.
Leave edges on older/larger plants tend to be more dentate than crenate. The frequent dropping of fine aerial roots is distinctive, hence the name "Curtain Ivy". Other species of Cissus have cotyledons that are multilobed similar to this plant, though not as dramatically as with this vine.
:Leaves of typical Cissus verticillata are green, with those of the Albonitens strain being silvery-grey.
Thanks, Greene, for sending me back to take one more look at C. verticillata.
