Leslieray, The Plant List lists
Cissus albonitens as a synonym of C. verticillata. The silver-grey form is widely referred to on the internet as Cissus sicyoides 'Albonitens' (or Cissus sicyoides albo-nitens). The primary form shown is plain green.
The silver-grey variety is clearly a stable genetic version, as I have had upwards of a couple hundred seedlings appear on my property, all silver-grey.
I expected to see it more prominently listed in the major databases. Not sure how this is best handled in the database, but the silvery variety is clearly separate from the green form.
