Plants on St. John in the US Virgin Islands

Hello,

Can anyone help me identify the snake-like plants in the following attachment? I searched using google and ask.com using every description I had. Please let me know if you know either the common or scientific name. Thank you in advance for any help you can offer.

Pitten

 

Selenicereus sp.

 

Could be a Selenicereus or a Hylocereus.

Would need a closer look at the plant than in the present picture.

 

Thank you very much. I appreciate the quick response.

 

Selenicereus or Aporocactus