2 small vines

Again in the Yucatan. Both have heart-shaped leaves.

 

First one looks like a Smilax.

 

The leaves look spot-on. Having trouble matching the inflorescence.

 

OK - both these vines were in fields of weeds, so I pinched some. Unknown K oozed some latex, and on closer inspection I'm thinking Euphorbiaceae. The other with the tiny flowers is magnified X6 with enlargement filters. Thanks.

 

#2 - Gonolobus barbatus (Apocynaceae).

 

1 - Cissampelos ?

 

Oh my word. May I ask how you know these names? Or what search terms you used? I can't thank you enough, Tyrliyh. I was prepared to have these labeled Unknown for a long time.